How to unlock the AI promise

Artificial intelligence (AI) technologies and their applications continue to grow and evolve. AI technologies are now being deployed across almost every industry and sector, including transportation, healthcare, defence, finance and manufacturing. But what exactly are these technologies? How prevalent are they? And with AI developing so rapidly, how will International Standards respond to these challenges?

As artificial intelligence (AI) becomes increasingly ubiquitous in various industry sectors, establishing a common terminology for AI and examining its various applications is more important than ever. In the international standardization arena, much work is being undertaken by ISO/IEC’s joint technical committee JTC 1 [1],  Information technology, subcommittee SC 42, Artificial intelligence, to establish a precise and workable definition of AI. Through its working group WG 4, SC 42 is looking at various use cases and applications. The Convenor of SC 42/WG 4 is Dr Fumihiro Maruyama, Senior Expert on AI at Fujitsu Laboratories.

Female researcher working in a laboratory.

Currently, there are a total of 70 use cases that the working group is examining. Health, for example, is a fascinating area to explore. Dr Maruyama himself describes one use case in which a program undertakes a “knowledge graph” of ten billion pieces of information from existing research papers and databases in the medical field. The application then attempts to form a path representing the likely development from a given gene mutation to the disease that deep learning has predicted from the mutation.

Solutions for health

Dr Radouane Oudrhiri is Chief Data Scientist at Eagle Genomics, whose work involves research undertaken “in silico” – that is, using primarily computer or data-driven innovation. One area of focus is on microbiome, which comprises all of the genetic material of micro-organisms (bacteria, viruses and fungi) within an entire collection, such as the human gut, mouth or skin. Microbiomes aren’t just limited to humans and other animals: oceans, soils and rivers all host microbiome communities that impact entire ecosystems. Microbiome data is very complex as it is hyper-dimensional and compositional. Dr Oudrhiri’s colleagues analyse microbiome data using AI and machine-learning computational tools for spotting associations that humans simply cannot. This radically improves productivity and enables revolutionary discoveries. It identifies new, sustainable ingredients and therapeutic targets and informs safer, more efficient industry practices.

AI technologies have been used to analyse human tumours for some time now, but as Prof. Frank Rudzicz, the Canada representative for SC 42, Director of AI at Surgical Safety Technologies Inc., and Associate Professor of Computer Science at the University of Toronto, points out in an interview for this article, this is just one application of several. For instance, an application has been deployed recently to identify early-onset dementia in more elderly patients. Residents at care facilities, normally assessed by a doctor once every six months for 15 minutes, have instead been issued with a computer tablet and asked to respond verbally to a series of questions. The program then alerts the medical team if anything seems awry, such as a change in the patient’s voice patterns, or if they seem unable to spot obvious relationships in an image of a family group.

Dr Oudrhiri has also been working with a company that has developed an AI solution, initially designed to make shoes smarter by collecting biomechanical metrics, measuring aspects such as shoe usage and sporting performance. It works via a chip inserted into the sole. The application has been so successful that advances in technology will soon allow it to be used for the detection of the likelihood of developing diseases – such as Parkinson’s – just by analysing the way in which an individual walks.

The AI of everything

An electrician monitors the telecommunication system at an offshore wind farm.

Health, of course, is not the only field that the work of SC 42 will impact. Dr Maruyama also cites the example of an AI program that uses ultrasonic waves for inspecting wind turbines. The program flags up any portions of the turbines that may have defects, clearing the way for its human inspection experts to make an informed choice about any subsequent course of action. Crucially, as the program is undertaking the initial inspection, time is freed up for human experts to inspect more turbines.

Intelligent transportation systems (ITS) is another sector that already relies heavily on AI. Dr Mahmood Hikmet, Head of Research and Development at Ohmio Automotion, a company that focuses on ITS, points to lidar technology, which measures distance to an object by the use of laser light rather than sound or radio frequency. If several of these laser lights are stacked on top of one another and spun round at top speed, the result is a three-dimensional “print cloud” showing how far away a given object might be. All of this takes place at “tens or hundreds of times a second”. It’s an application that can be used in driverless cars, with the capability even to distinguish between different blades of grass.

Dr Hikmet also highlights crowd-counting AI for driverless cars, a predictive analysis application drawn from data on the infrastructure side of ITS (as opposed to the cars themselves). This involves cameras that monitor people walking back and forth, tracking them throughout an entire shot, whilst predicting their likely “route” as they interact with others. This data is then picked up by the car and used to prevent any possible collisions.

Behaviour training for machine learning

Medical scientists discuss CT brain scan images on a computer screen.

YOLO – You Only Look Once – is object-recognition technology that separates to the tiniest degree the different aspects of disparate objects. It has obvious applications in safety and security contexts. Behavioural cloning is another field of AI, in which a machine is obliged to learn a series of tasks through reinforcement training. It’s “a way of punishing and rewarding a neural network for doing things right or wrong,” Dr Hikmet explains. The network ends up learning from the reward or punishment signals it receives from the human user as to how it is supposed to “behave”.

Venture capital is key to certain aspects of Dr Oudrhiri’s work. One exciting area of research seeks to digitize and systematize nothing less than “the entire entrepreneurship process”. By gathering data throughout the venture life cycle, identifying innovation challenges and categorizing information, the platform provides predictive models on a company’s performance, growth potential and valuation. A risk profile is therefore established, assisting in the selection process and the entire start-up evolution. Until now, information of this kind has been collected through human responses to surveys. These are more aggregate in nature, do not lend themselves to easily-built predictive models, or often lead to unwittingly biased conclusions. After all, it is only natural that company owners will want their projects to succeed.

These examples are as ingenious as they are effective. And yet the vast majority of us are unlikely to have heard of these specific AI technologies, still less to have an awareness of their impact. Current AI solutions are often developed in silos and built for very specialized applications; their true power will be properly realized when they are considered in a holistic framework, such as the horizontal frameworks SC 42 is developing.

A role for standards

For this and other reasons, International Standards are now under development. Dr Oudrhiri suggests that standards are needed to “cut through the hype” so that fears and objections to AI can be either taken on board or simply rebutted as groundless. Radical ideas for AI applications are often promoted with great fanfare in the media and other public forums – for better or worse – yet, as Dr Maruyama points out, many, if not most of these ideas never get past the Proof of Concept (PoC) phase.

Consumers do need to be protected – from physical harm, certainly, but also from companies that use the phrase “artificial intelligence” as a way of promoting a product simply to spike its share price. And given that AI data is at the intersection of many different fields – software engineering, neuroscience, decision making – it is hugely important that a common framework is developed, so that consumers, producers and regulators can speak a common language.

This is not as ridiculous or unlikely as it first sounds. Experts talk of “AI winters” in which previous generations of AI technology peaked, only to fall away because of misplaced experimentation and consequent withdrawal of funding. The same could possibly happen again and undo much of the progress in today’s world.

STATE OF THE PRACTICE

Hand holding a smartphone displaying augmented-reality image of a tomato.

It is precisely because AI technologies are developing so quickly that International Standards are so needed. In the words of Dr Oudrhiri, they should focus on the “state of the practice, not the art”. SC 42 has already produced draft technical reports, with standards under development. The subcommittee is working with technical committee ISO/TC 69, Applications of statistical methods, on mapping both terminologies and concepts within the machine-learning world, between statistics, software engineering, AI, data science, and operational research. An entire working group – SC 42/WG 3 – is looking solely at trustworthiness.

Dr Maruyama believes the best approach to developing International Standards is to converge around a limited number of alternatives, and to “focus on where technology is already stable”. A common language and criteria are being created to get beyond the PoC stage. Another area of focus is describing the process and life cycle for developing AI applications. They will also help capture the broad requirements of consumer needs, which must include the ethical and societal considerations in use cases and applications. A third area focuses on model validation. This is highly technical and statistical in nature, but will one day ensure that programs and machines will do what they are supposed to be doing.

  1. ISO/IEC JTC 1 is the joint technical committee formed by ISO and its sister organization, the International Electrotechnical Commission (IEC), to serve as a focal point of standardization in information technology.
By |2019-11-11T07:57:10+00:00November 11th, 2019|Weld Engineering Services|Comments Off on How to unlock the AI promise

It’s all about trust

Artificial intelligence (AI) has the potential to aid progress in everything from the medical sphere to saving our planet, yet as the technology becomes ever more complex, questions of trust arise. Increased regulation has helped to rebuild this trust, but grey areas remain. How can we ensure AI is trustworthy without impeding its progress?

Close up view of 52 Facebook notifications on a smart phone.

Using our personal data without authorization to spam us with products to buy is one thing, but quite another is when it is used in an attempt to manipulate politics. This was best demonstrated in the Cambridge Analytica affair, where millions of Facebook profiles of US voters were harvested to build a software system that could target them with personalized political advertising. The dangers of this were well recognized by the US consumer regulator that slammed Facebook with a USD 5 billion fine, but the trust in how organizations use our data was rattled, to say the least. The scandal also exposed the power, and dangers, of badly used artificial intelligence (AI).

But AI is here to stay. Used well, it can help to improve our lives and solve some of the world’s toughest issues. It enables humans and machines to work collaboratively, with the potential to enhance the capabilities of humans and technology beyond what we can even imagine. For organizations, this can mean increased productivity, reduced costs, improved speed to market and better customer relations, amongst other things. This is reflected in a Forbes Insights survey titled “On Your Marks: Business Leaders Prepare For Arms Race In Artificial Intelligence”, which revealed that 99 % of executives in technical positions said their organizations were going to increase AI spending in the coming year.

The technology is developing at lightning speed, raising as many questions about safety and security as the benefits it promises to deliver. If the point is to outperform humans on decisions and estimations such as predicting disease outbreaks or steering trains, how can we be sure we have control?

In AI we trust?

Leading industry experts believe that ensuring trustworthiness from the outset is one of the essential aspects to widespread adoption of this technology. With this in mind, ISO and the International Electrotechnical Commission (IEC) set up joint technical committee ISO/IEC JTC 1, Information technology, subcommittee SC 42, Artificial intelligence, to serve as a focal point for AI standardization. Among its many mandates, the group of experts is investigating different approaches to establish trust in AI systems.

Convenor of the trustworthiness working group within SC 42, Dr David Filip, research fellow at the ADAPT Centre in Trinity College Dublin, a dynamic research institute for digital technology, sums it up: “When software began ‘eating the world’, trustworthiness of software started coming to the forefront. Now that AI is eating the software, it is no big surprise that AI needs to be trustworthy.”

“However,” he analyses, “my impression is that people fear AI for the wrong reasons. They fear doomsday caused by some malicious artificial entity… A far bigger issue, I feel, is that the lack of transparency will allow a deep-learning system to make a decision that should be checked by a human but isn’t.”

Naturally, the level of harm depends on the way in which AI is used. A poorly designed tool that recommends music or restaurants to users will obviously cause less harm than an algorithm that helps to diagnose cancer. There is also the danger of using data to manipulate outcomes, such as in the Cambridge Analytica case.

Threats to trustworthiness

Fully automatic bottling plant in operation.

According to the Organisation for Economic Co-operation and Development (OECD), a collaborative international government body dedicated to furthering economic progress and world trade, malicious use of AI is expected to increase as it becomes less expensive and more accessible [1]. Malicious use, personal data leaks and cybersecurity are key threats to our trustworthiness.

A self-driving car, for example, that is involved in an accident could be hacked and information related to liability meddled with. A system that aggregates patient data and uses it to recommend treatments or make diagnoses could suffer errors or bugs that result in disastrous outcomes.

Other risks include the effects of data or algorithmic bias, a phenomenon that occurs when an algorithm produces results that are systematically compromised due to erroneous assumptions in the machine-learning process. When influenced by racist, prejudiced or other subjective behaviour, this can have a profound influence on everything, from what you see in your social media feed to the profiling of criminals in policy systems, or the processing of immigration claims.

AI systems that require access to personal information also pose risks to privacy. In healthcare, for example, AI has the potential to help advance new treatments by using patient data and medical records in certain ways. But this creates the possibility that data will be misused. Privacy laws reduce that risk but also limit the technology. It is clear that if AI systems are robust, secure and transparent, the eventuality of this happening is removed and their potential can flourish so we can fully reap the benefits.

What is being done

Woman holding her smartphone and printing on a 3D printer.

The industry is very aware of the need for trustworthiness and many technologies have been developed, and are steadily evolving, such as differential privacy, which introduces bits of randomness into aggregated data in order to reduce the risk of re-identification and preserve the contributions of individual users. Other examples include cryptographic tools such as homomorphic encryption and multiparty computation, which allows machine-learning algorithms to analyse data that is still encrypted, and thus secure. Or using a trusted execution environment, which is a technology to protect and verify the execution of legitimate software.

The European Union (EU) formed a High-Level Expert Group on Artificial Intelligence (AI HLEG) to support the implementation of Europe’s strategy on artificial intelligence, which includes ethical, legal and social dimensions. Earlier this year, it published Policy and Investment Recommendations for Trustworthy Artificial Intelligence that set out the group’s vision for a regulatory and financial framework for trustworthy AI.

On an international scale, the Partnership on AI to Benefit People and Society is dedicated to advancing the public understanding of AI and formulating best practices for future technologies. Bringing together diverse global voices, it works to “address such areas as fairness and inclusivity, explanation and transparency, security and privacy, values and ethics, collaboration between people and AI systems, interoperability of systems, and of the trustworthiness, reliability, containment, safety and robustness of the technology”, thus providing support opportunities for AI researchers and other key stakeholders.

“We are a co-founder of the Partnership on AI,” says Olivier Colas, Senior Director International Standards at Microsoft, who also plays an active role in SC 42, “and we’ve forged industry partnerships with both Amazon and Facebook to make AI more accessible to everyone.” He asserts that “as AI systems become more mainstream, we as a society have a shared responsibility to create trusted AI systems and need to work together to reach a consensus about what principles and values should govern AI development and use. The engineering practices that can be codified in International Standards should support these principles and values”. Microsoft, he says, has set up an internal advisory committee to help ensure its products adhere to these principles and takes part in industry-wide discussions on international standardization.

The standards factor

Engineer works a robotic arm from a tablet.

Standards, then, are the key. Dr Filip explains why: “We can never guarantee user trust, but with standardization we can analyse all the aspects of trustworthiness, such as transparency, robustness, resilience, privacy, security and so on, and recommend best practices that make AI systems behave in the intended and beneficial way.”

Standards help build partnerships between industry and policy makers by fostering a common language and solutions that resolve both regulatory privacy issues and the technology required to support that, without stifling innovation. Colas believes standards will play an important role in coding engineering best practice to support how AI is being developed and used. They will also complement emerging policies, laws and regulations around AI.

“International Standards have been successfully used to codify risk assessment and risk management for decades. The ISO/IEC 27000 series on information security management is a great example of such an approach for cybersecurity and privacy,” he says. It helps organizations manage the security of their assets, such as financial information, intellectual property, employee details or information entrusted by third parties. “What’s more, AI is a complex technology,” observes Colas. “Standards for AI should provide tools for transparency and a common language; then they can define the risks, with ways to manage them.”

The time is now

Rear view of humanoid robot with screen on torso displaying directions to ice cream.

The ISO/IEC JTC 1/SC 42 work programme outlines several topics for AI, many of which are currently under development in its working group WG 3, Trustworthiness. Projects include a number of normative documents directly aimed at helping stakeholders in the AI industry build trust into their systems. One example is future technical report ISO/IEC TR 24028, Information technology – Artificial intelligence (AI) – Overview of trustworthiness in artificial intelligence, which analyses the factors that may contribute to the erosion of trust in AI systems and details possible ways of improving it. The document covers all stakeholders and AI vulnerabilities such as threats to security, privacy, unpredictability, system hardware faults and much more.

SC 42 takes a horizontal approach by working closely with as many people as possible across industry, government and related technical committees, so as to build on what already exists rather than duplicating it. This includes ISO/TC 262, Risk management, whose standard ISO 31000 on risk assessment serves as a basis for the development of ISO/IEC 23894, Information technology – Artificial intelligence – Risk management. The new guidelines will help organizations better assess typical risks and threats to their AI systems and effectively integrate risk management for AI into their processes.

The standard will be joined by other important technical reports on the assessment of the robustness of neural networks (ISO/IEC TR 24029-1) and the bias in AI systems and AI-aided decision making (ISO/IEC TR 24027). All of these will complement the future ISO/IEC TR 24368, designed to tackle the ethical and societal concerns thrown up by AI (see article To ethicize or not to ethicize…).

Early consideration of trustworthiness in standardization is essential for ensuring the successful role of artificial intelligence in society. “Humans need trust to survive in every sense,” remarks Dr Filip. This includes trust in technology and infrastructure to be safe and reliable. “We rely on our politicians to put laws and systems in place that protect us, and we rely on the good of humans around us to function in everyday society. Now, we need to be able to trust software and digital technology in all its forms. Standards provide us with a way of achieving that.”

  1. OECD, Artificial intelligence in society. Paris: OECD Publishing, 2019
By |2019-11-11T07:57:10+00:00November 11th, 2019|Weld Engineering Services|Comments Off on It’s all about trust

Embracing the power of technology

Just how worried should we be about killer robots? Amidst all the talk about how artificial intelligence (AI) is threatening society, some experts believe AI shouldn’t be feared. Here’s why we can embrace the power of technology.

Artificial intelligence (AI) is everywhere. AI recommends movies and restaurant choices, prevents cars from crashing, books flights, tracks taxis, identifies financial fraud and creates playlists to work out to. In the 1950s, AI was defined as machines operating in ways that were regarded as “intelligent”, or equal to tasks performed by humans. Since then, computer use and data generation have increased enormously, with current estimates of 2.5 quintillion bytes being produced every day.

Hands of a woman using a smartphone.

Much of this data is output, or information, collected from daily use of mobile phones, social media and the Internet. This information is commonly known as “big data” and is where AI steps in to help. AI uses machine learning to analyse this data in real time at a speed and volume no human ever could. Not surprisingly, the private sector has embraced AI and increasingly uses it to gain more accurate information on purchasing behaviour, financial transactions, logistics and predicting future trends.

The United Nations recognizes the power of AI and is working with the private sector on “data philanthropy” so information such as surveys, statistics and consumer profiles can be used for public good. For example, researchers are using satellites and remote sensors with AI technology to predict extreme weather events that affect agriculture and food production in developing countries.

With this in mind, ISO – in conjunction with its sister organization, the International Electrotechnical Commission (IEC) – has identified the need to develop standards for AI that can benefit all societies. The ISO/IEC JTC 1/SC 42 subcommittee for artificial intelligence was established two years ago and has already published three standards relating to big data, with 13 other projects in development. Chaired by business and technology strategist Wael William Diab, it will develop and implement a standardization programme on AI to provide guidance for other ISO committees developing AI applications.

Setting boundaries

SC 42 has a broad scope of AI development that includes basic terminology and definitions, risk management, bias and trustworthiness in AI systems, robustness of neural networks, machine-learning systems and an overview of ethical and societal concerns. Twenty-seven member countries are participating in this programme with another 13 countries observing. Ray Walshe, Assistant Professor of ICT Standardization at Dublin City University, Mr Wo Chang, Digital Data Advisor for the Information Technology Laboratory (ITL) of the National Institute of Standards and Technology (NIST) in the United States, and Dr Tarek Besold, Scientific Advisor of Neurocat in Berlin and Chief Behavioural Officer (CBO) at Telefonica Innovation Alpha Health in Barcelona, are three key members of this committee. Do they identify with Peter Parker when he became Spiderman? With great power comes great responsibility.

Industrial robotic arm picks cardboard boxes off a conveyor belt in a warehouse.

Dr Besold isn’t daunted. “AI is a new and fast-changing field, full of innovators and disruptors. We need to define the state-of-the-art and common-sense definitions of AI mechanisms and technologies. Yes, developing norms and standards is a big task and interoperability is vital because AI is so far-reaching. AI is part of many futures as a tool rather than the leader.”

SC 42 is “building from the ground up,” says Chang. “We provide interoperable frameworks and performance tools in the form of standards on AI and big data, which can then be shared with government and private enterprise. These frameworks set the AI ‘boundary conditions’ that can be defined using probabilities to determine the risk factors. Not just boundaries, but a safety net that uses risk management in implementing them.”

It remains up to governments around the world to decide what they regulate. Ray Walshe says that “the public needs to recognize that there is a difference between standardization, legislation and regulation. Ninety percent of the world’s data has been generated in only the past two years. This is an incredible mountain of both structured and unstructured data to be stored, aggregated, searched and correlated for the myriad of businesses, governments and researchers who provide tools and services. Governments and private industry will often use International Standards as a reference to regulation, to ensure that industry, societal safety and ethical concerns are met”.

Tricking AI

Safety of data and how it is used remains a concern in society, especially when the dreaded “computer error” is mentioned. Mathematics emerges as the crucial ingredient. Dr Besold says AI programs play a “numbers game”, with researchers generating attacks and defences on AI systems, trying to “trick them” and developing solutions to the problems they discover.

AI focuses on high specificity, which means that it’s tailored to a specific task, Besold says. “AI takes away the time-consuming and boring programming from people, but it still needs rules and measures that are set by humans. If you apply safety boundaries to the self-driving car, it’s obvious that this technology needs safeguards and standard definitions. Is it an acceptable risk to run over an elderly person or a small child? Neither is acceptable, of course, and we want to help governments and industries accept and use the measures we recommend.”

Photo collage of a low-battery warning in an electric car and an aerial view of a traffic jam.

“Probability in risk assessment is the key word,” Wo Chang agrees, and he uses cats as a rather powerful example: “If you take image recognition, you’ll see that an effective system will highlight an error if the program has not experienced it before and shut down. The system has been given millions of pictures of cats and dogs so that its ability to differentiate between them is fine-tuned. The system has been trained under well-defined conditions, but it’s impossible to model for everything. What happens if it comes across a cat wearing a bow tie? It shows that if one part of a picture is changed, the outcomes can be very different. This could be a ‘bug’ (or a bow-tie-wearing cat) that does not meet the trained environment and system function and puts in a safety constraint to avoid failures. If applied to more serious applications, then thorough testing can determine probabilities and shut down the system to prevent more catastrophic decisions or failures.”

Trust your data

With use of AI in potentially sensitive areas such as healthcare, surveillance and banking, there remains the risk that human bias affects the data used. Dr Besold acknowledges this. “There is bias in AI, but we can agree on a standard definition to address this bias. Regulators may accept that a 5/10 bias is acceptable for soap dispensers but certainly not when it comes to self-driving cars.”

In the medical field, he says, government and society need to decide if we are OK in a validated world. Are we OK with using data that’s mostly from the first world, for the first world, in the first world? Do regulators accept that the data can only be applied to these people or insist that it has to work for everyone in the world but will be statistically less accurate?

“Look at organ transplants. AI could potentially have access to all available medical records across the world and apply an enormous range of measures to determine which person gets to the top of the list, ensuring less rejection of transplanted organs and much better medical outcomes. However, if you are on a transplant list and realize that other people are receiving organs ahead of you, are you willing to accept the data used to make that decision?”

Trustworthiness is vital. The committee and researchers in the field need to look at how other fields such as medical and automotive apply measures and earn this trust by government and wider society.

Emerging machine learning is starting to look at the more pressing needs of the developing world, according to Wo Chang. “In Africa, access to energy is a big problem in rural areas. With a large uptake of smartphones there, apps are being developed that can diagnose basic medical problems in remote clinics, provide preliminary data such as weather forecasts, soil quality and agricultural tips.”

Fears and phobias

Despite these advances, much of the general public fears AI as a scary development, imagining robots becoming Schwarzenegger-like “terminators” replacing human beings. “This won’t happen in my lifetime,” Ray Walshe says. “Don’t get me wrong, AI is a game changer and is capable of doing very precise jobs very fast. This is impressive and generates huge cost savings, but it’s known as ‘narrow intelligence’. The human brain is capable of doing that ‘narrow’ task but also thousands of other ‘broader’ and more complex tasks.” Robotics is one of the most exciting areas for AI development, but the myth that machines will be capable of artificial general intelligence like “Terminator” will not happen in the foreseeable future.

Engineer works with a HoLoLens headset to place a virtual robotic arm into the production line.

“AI is still more of a promise than an achieved feat,” agrees Dr Besold. “The research side is progressing faster than the application side. Robotic arms in factories can only do what they are programmed for and there’s no ’intelligence’ in this. If a change is needed, such as working on the other side of the car, it requires a change in programming that involves a human being.”

Dr Besold says that AI developers need to engage more with society to provide transparency, and Chang sees that standards developed by the committee to address system robustness, data quality and boundaries will increase trust and the ability to interact with a variety of data repositories.

All three committee members see jobs changing rather than disappearing. AI will perform more manual work and routine tasks such as standard contracts and documents, giving people more time to concentrate on skills involving empathy, “bedside manner” in medical treatment, ethical matters and lateral thinking. Opportunities for re-education and to work on more challenging and interesting situations will arise.

“How ironic if increased use of AI in workplaces resulted in reviving union movements,” Dr Besold says. “If you’re at a school or hospital, then using AI for logistics or declarative knowledge such as facts, dates and figures may result in less staff time per week. Do governments and employers fire some staff or do they negotiate a shorter work week for a more balanced life? This is where consensus is needed: what’s the biggest benefit to society?”

New horizons

Future trends and benefits for AI will see more hands-free applications according to Wo Chang. “Wearing smart glasses will enable users to look at something like a broken washing machine and get information on what is wrong, where the problem is located and how to fix it. For tourism, you’ll be able to look at a building and find out the history, function and services it still provides while you are standing in front of it.”

Woman with a wearable computer in the form of smart glasses.

Smart glasses aside, Chang has loftier hopes. “When government and businesses keep their citizens and customers at the forefront and learn how to leverage the best of AI and their people, it will be a bright future indeed.”

Ray Walshe has a personal interest in seeing how AI can be used to help in reaching the objectives outlined in the United Nations Sustainable Development Goals, a universal call to action to ensure peace and prosperity for mankind. “How can AI be used to help alleviate poverty worldwide, hunger and malnutrition, for better water and sanitation, equal opportunities in education, work and gender, and to accelerate development in developing nations? These are major challenges that require disruptive and game-changing technologies and expert collaboration on a global scale.”

We need to do more than put cat ears on friends’ social media selfies, Dr Besold says. “My hope for the future is that actual applications of AI will result in more effort being put into logistics that help in the field of medicine, agriculture, climate change and scientific discovery – important applications that will benefit society.”

Seems like the ISO/IEC JTC 1/SC 42 subcommittee for artificial intelligence will be busy.

By |2019-11-11T07:57:10+00:00November 11th, 2019|Weld Engineering Services|Comments Off on Embracing the power of technology

In the Lab: Alternative Recycling Process for Lithium-ion Batteries: Molten Salt Approach

Home > Journal Archive > In the Lab: Alternative Recycling Process for Lithium-ion Batteries: Molten Salt Approach

Johnson Matthey Technol. Rev., 2020, 64, (1), 16

Ruth Carvajal-Ortiz’s current research is centred around innovation in energy storage. She has a special focus on the characterisation of materials, molten salts and their potential applications to several industrial processes, such as metal production and recovery. Currently a research fellow at Coventry University, UK, Ruth is in charge of the molten salts recycling work package of the Custom Automotive Lithium Ion Battery REcycling (CALIBRE) consortium, a circular economy project for automotive lithium-ion batteries (LIBs) funded by Innovate UK and led by Johnson Matthey.

Ruth’s academic and industrial background includes electrochemical characterisation techniques (such as voltammetry), corrosion in metals under hydrothermal conditions and synthesis and characterisation of catalysts. She obtained her doctoral degree from the University of Manchester, UK, where she worked designing and testing an in situ molten salt electrochemical oxidation cell to measure hydrogen diffusion in zirconium alloys (1). Prior to her doctoral studies, Ruth worked with corrosion in metals involved in nuclear applications, during her MSc and as a research chemist at Trent University in Peterborough, Canada. The main project at Trent University’s supercritical water laboratory was part of generation IV (GEN-IV) nuclear reactor investigations. The aim of the project was to understand the corrosion behaviour of stainless steel in hydrothermal and supercritical conditions (24). The project included collaborations with the Canadian Nuclear Society in Chalk River, Ontario. Ruth’s background also includes synthesis and characterisation of catalysts such as titania, used in biofuels.

Ruth Carvajal-Ortiz

  • Position: Research Fellow in Electrochemical Engineering

  • Department: Institute for Future Transport and Cities (IFTC) Centre for Advanced Low-Carbon Propulsion Systems (C-ALPS)

  • University: Coventry University

  • Address: Puma Way, Coventry

  • Post Code: CV1 2TL

  • Country: UK

  • Email: ruth.carvajalortiz@coventry.ac.uk

About the Research

The demand for LIBs has substantially increased during recent years and is forecast to grow almost 66% globally by 2025 for electric vehicles alone (5). This increases the need for an efficient and sustainable recycling process and circular economy system (6). Coventry University and several battery and automotive companies are working together on a project to provide an achievable and effective way to recycle LIBs. CALIBRE is a new consortium that covers several stages (Figure 1), from ageing and end-of-life (EoL) assessment to chemical or molten salt recycling and materials regeneration. Additionally, the project includes a mechanical separation and material recovery process at pilot scale, reuse and life cycle assessment.

Fig. 1.

LIB recycling circular economy project, CALIBRE scheme

LIB recycling circular economy project, CALIBRE scheme

A molten salt recycling process is part of the chemical recycling package. This process provides a novel approach that uses common molten salts as electrolytes and reaction media. The main advantage of the molten salts is their performance versatility which, given the multiple choices of battery electrode chemistries that are presently in the market, provide an improvement over current methods.

For the study, different eutectic mixtures of molten salts (7, 8) (for example sodium, potassium, lithium and calcium borates and chlorides, sodium and potassium carbonates) are tested to provide an optimised alternative or a shortcut to the hydrometallurgical, pyrometallurgical or even biometallurgical recovery of metals (such as cobalt, nickel and manganese). This approach takes advantage of the salts’ electrochemical and solubility properties. Initially, a two-phase molten salt system composed of sodium borate and sodium chloride was employed to evaluate the feasibility of metal recovery from mixed feeds of oxides of cobalt, manganese, copper and nickel mixtures and virgin cathode materials (for example nickel manganese cobalt (NMC) 111) by electrodeposition. The process operates within a temperature range of 800–900°C, where both salts are in liquid state. Amietszajew et al. reported 98–99% metal purity for single metal oxides deposited using the process described (Figure 2) (9, 10).

The system has demonstrated stability and could be used together with other metal recycling sources and processes. Additional insight into the environmental impact of the pilot scale process such as its carbon footprint and its efficiency are also being assessed. The new method might solve some of the issues related to the hydrometallurgical methods currently used by the recycling industry, including significant water waste, sulfate byproducts and toxic acids that are detrimental to the environment. Furthermore, the method developed is inclusive of a range of metals, which is of high importance considering the growing and future complexity of the battery waste stream and the need for the world to recycle essential materials, while at the same time reducing pollutants and greenhouse gas emissions.

Fig. 2.

Molten salt electrochemical cell scheme showing cathode and anode reactions during the process of metal deposition. Working electrode (WE) = half-cell where reaction occurs = cathode. Reference electrode (RE) = evolution of chlorine (oxidation) = anode

Molten salt electrochemical cell scheme showing cathode and anode reactions during the process of metal deposition. Working electrode (WE) = half-cell where reaction occurs = cathode. Reference electrode (RE) = evolution of chlorine (oxidation) = anode

By |2019-11-06T15:31:59+00:00November 6th, 2019|Weld Engineering Services|Comments Off on In the Lab: Alternative Recycling Process for Lithium-ion Batteries: Molten Salt Approach

New International Standard for verification bodies just published

The validation or verification of information declared in claims is a key way of demonstrating that what is said is reliable and true. But only if those performing this confirmation are doing it correctly. A new ISO and IEC standard just published will ensure the validators and verifiers are competent, so everyone can have confidence in the claims.

ISO/IEC 17029, Conformity assessment – General principles and requirements for validation and verification bodies, contains general principles and requirements for the impartial, competent and consistent provision of validation and verification activities by the assessment bodies performing them.

The newly published International Standard is useful for organizations in any sector, providing assurance that claims are either plausible when it comes to the intended use (validation) or correctly stated (verification). It is designed to be applied in conjunction with existing sector-specific schemes.

As a framework for validation and verification activities, it provides the general requirements to which new sector-specific standards can refer, such as the upcoming ISO 14065, Environmental information – Requirements for bodies validating and verifying environmental information, due to be published in 2020. The two standards, therefore, will go hand in hand.

ISO/IEC 17029 is expected to form the basis of many more sector application standards across a range of industries that will benefit from its general requirements.

Dr Stefanie Vehring, Convenor of the working group that developed the standard, said validation and verification according to ISO/IEC 17029 are assessments that apply to declared information such as claims or declarations.

“ISO/IEC 17029 complements the established conformity assessment tools by fitting in between inspection and certification,” she said.

“It provides a conformity assessment approach where the information itself serves as the object of assessment and confirmation of this declared information is sought.”

ISO/IEC 17029 is the latest in a series of standards designed for the assessment and recognition of those performing conformity assessment activities and was developed by ISO’s Committee on conformity assessment (CASCO). Many of these are published jointly by ISO and its standardization partner, the International Electrotechnical Commission (IEC).

Together, these standards make up the CASCO Toolbox. Developed with input from stakeholders all over the world, the toolbox includes the contribution of the International Accreditation Forum (IAF) and the International Laboratory Accreditation Cooperation (ILAC), two key ISO partners.

ISO/IEC 17029 can be purchased from your national ISO member or through the ISO Store.

CASCO is the ISO committee that develops policy and publishes standards related to conformity assessment.
By |2019-11-04T09:00:36+00:00November 4th, 2019|Weld Engineering Services|Comments Off on New International Standard for verification bodies just published

Building resilience: ISO standard for business continuity just updated

Natural disasters, fires, supply chain issues or cyber-attacks are just some of the many unexpected yet possible threats to the smooth running of any business. Consistent and robust business continuity planning for what to do when disaster strikes is the best defence.

Uncertainty has never been more certain, and business disruption is a key area of concern for most executives, but, managed well, the benefits and opportunities are many. Having effective business continuity plans and capabilities in place is key to restoring operations if anything goes awry. 

ISO 22301, Security and resilience – Business continuity management systems – Requirements, is the world’s first International Standard for implementing and maintaining an effective business continuity plan. It enables an organization to have a more effective response and a quicker recovery, thereby reducing any impact on people, products and the organization’s bottom line.

The standard has recently been updated to remain current and relevant and continue to meet market needs. James Crask, Convenor of the ISO group of experts that developed the standard, said it brings together some of the world’s best practice to help organizations of any kind respond to, and recover from, disruptions effectively.

“A resilient organization is one that is able to adapt to change, is aware of where its vulnerabilities lie and has plans in place to respond should things go wrong,” he said.

“Recovering quickly from a business disruption requires a deep understanding of what is important to an organization, easy-to-follow response plans and staff that know their role in an incident.

“ISO 22301 helps organizations do all of that, thereby providing reassurance to their clients, suppliers, regulators and other stakeholders that they are not only prepared for disruption, but in shape for the future.”

Key improvements to the latest version include clearer structure and terminology to foster a better understanding of what is required and updates to remain in line with all other ISO management system standards.

ISO 22301 was developed by ISO technical committee ISO/TC 292, Security and resilience, the secretariat of which is held by SIS, ISO’s member for Sweden. Learn more about the committee on its dedicated Website.

A free publication about ISO 22301, the International Standard for implementing and maintaining effective business continuity plans, systems and processes.
By |2019-10-31T08:32:23+00:00October 31st, 2019|Weld Engineering Services|Comments Off on Building resilience: ISO standard for business continuity just updated

Closed-Loop Recycling of Polymers Using Solvents

Johnson Matthey Technol. Rev., 2020, 64, (1), 4

Introduction

There is an obvious and increasing need to preserve valuable resources and reduce waste and pollution. Maximising the functional lifetime of materials with reuse and recycling practices has long-term benefits (1). These themes are embodied in the circular economy concept, where materials are considered in terms of the service they provide when fabricated into products (2). Extended product lifespans deliver more service from a material, while waste represents lost potential.

The EU and China are the two regions with the most prominent circular economy strategies. Specific policies have been established since 2015 in the EU (2) and even earlier by the Chinese government (3). Although the regulatory measures are broad, encompassing critical materials and product (eco)-design, European law focuses on recycling targets. China has additional policies encouraging industrial symbiosis so responsibility for waste is shared, including heat and material (waste) outputs of one industry being provided as the input for another. Academic interest in the circular economy concept is high, ranging from policy to product design to improved recycling technologies.

Although recycling targets are an obvious, easily monitored and (potentially) enforceable legislative measure to promote a circular economy, there are many end of life options that preserve a much greater degree of product functionality. Waste avoidance is not enough, if it were then current trends towards biodegradable packaging, waste incineration and landfill reduction would be sufficient. Maintaining and extending the maximum value of limited resources is necessary for a sustainable society. In order to reuse, repair, remanufacture and refurbish products, manufacturers need to be involved in the value chain beyond production. This could be in formal partnerships with waste processing agencies or by implementing extended producer responsibility, pledging to return defunct products to use (4, 5). A change of emphasis towards valuing a product’s service not its material worth prompts a reduction in waste and better use of resources. For example, chemical leasing is a business model where payment for a service is based on productivity, not how much material changes hands (6). Under this business model it is possible to buy paint on the basis of what surface area is to be coated or industrial solvents according to how much apparatus needs to be cleaned or degreased. It is now important to the selling party to provide as little product as possible to maximise profit and in doing so minimise waste. Similar principles are being applied to consumer purchases of clothes and electronic devices on a leasing basis, rather than buying an article outright and eventually disposing of it (7).

Inevitably all products will become obsolete and the obvious way to extend the value provided by finite materials at this point is through recycling. Recycling processes for most types of material produce an inferior product that enters lower value applications, known as open-loop recycling or downcycling. Coupled with poor collection rates, this means 95% of the economic value of the plastic market is lost after a single use (8). Mechanical recycling is effective for PET, polyethylene (PE) and polypropylene (PP), whereby the waste is shredded, melted and remoulded (9). Recycling infrastructure for other polymers is more limited internationally and for composites and thermoset plastics the design and chemical composition of the material excludes conventional recycling completely as an end of life option (10). The presence of additives in many plastic products results in a recyclate with unknown impurities, some of which are toxic and they may be unnecessary or undesirable for the secondary uses of the material.

Closed-loop recycling, returning materials back to their original use, is prevented by product designs that irreversibly combine different types of materials, but also by waste collection and separation processes and the recycling processes themselves. These three aspects of waste management can be addressed by proactive product design, policy action regarding waste collection and recycling infrastructure and engineers and scientists motivated to create new recycling technologies.

Solvents can be used to selectively dissolve waste polymers at end of life for the separation of mixed wastes and composites. The advantage of this technology compared to mechanical recycling is that it is capable of returning a plastic with the same quality as virgin materials as judged by tensile strain and other properties. Recyclate specification sheets often include space for this technical information alongside a description of its appearance (such as colour and particle size) (11). Quality control and the communication of recyclate properties is important to ensure the most value is obtained when deciding what materials are used to make products. Chemical recycling is another alternative recycling technique that takes material a step further back in the production chain by depolymerising it back to monomers (12). This is advantageous for polymers that degrade during use, including biodegradable polymers wrongly captured by recycling practices or that are unstable at the elevated temperatures used in recycling processes. Chemical recycling can potentially be solvent free but in many examples a solvent is required to homogenise the polymer with reactants and catalysts.

In this work, three important case studies will be discussed where a solvent-based process is used to recycle a polymer. The emphasis is on commercial applications, exploring their advantages and limitations. For a theoretical examination of polymer solubility and the related phenomena of gelation and swelling, other literature is available that provides the background knowledge for solvent-based recycling methods (13).

For completeness, it must be said there are less desirable end of life options for waste in a circular economy whereby the value of materials is significantly reduced or completely eliminated. This includes increasingly popular energy recovery (incineration), as well as biodegradation and landfill. Incineration offers some value and offsets energy demand that would otherwise likely be obtained from fossil fuels. Despite the additional use of waste material as a fuel, ultimately the material is lost. Carbon emissions and any other form of pollution represents a loss of resource and the material value it could have provided to society. Biodegradable products are designed to avoid litter. There are also some instances where it is impossible to collect a product for reuse or recycling. One example is lubricants. Forestry regulations require chainsaw and other ‘total-loss’ lubricants to be biodegradable (14). To prevent avoidable resource depletion and waste, the only articles suitable for incineration or biodegradation in a circular economy are bio-based products made only of sustainably sourced renewable materials (15).

Solvent-Based Polyethylene Terephthalate Recycling

One of the most ubiquitous forms of plastic waste is the plastic bottle. Typically made of PET, these single use articles can be effectively recycled, although most often this is in an open recycling loop to make polyester fabrics. Despite this, the recycling rate of PET bottles in Europe is below capacity at only 57% (16), indicating flaws in collection and sorting. Product design also limits recycling. Once (recycled) PET is combined with other materials to make textile products, the inability of conventional recycling processes to separate the PET means there is no option to further recycle the material. For textiles consisting of a mix of cotton and PET, a solvent-based process can perform the separation and recovery of both components.

There are a large number of patented procedures for recycling textile waste containing mixed polyester and cotton items, typically clothes. A solvent can be applied to selectively dissolve either cellulose or PET. The remaining, undissolved polymer can also be recycled after filtration and drying or alternatively converted into a derivative compound. To selectively dissolve cellulose, the solvents used to make rayon fibres are applicable, such as N-methylmorpholine N-oxide (NMMO) which is used in the Lyocell process. The high flammability and oxidising potential of NMMO does not make it an ideal solvent from a safety point of view but it is typically recycled within processes with high efficiency. It has been reported that processes dissolving the PET component of composite textiles, for example in sulfolane (17), reduce the quality of the cellulose fibres (18). Nevertheless, the difficulty in dissolving cellulose has meant research efforts have focused on the solvent-based recovery of PET from textiles rather than the cotton.

Worn Again is a UK-based company that has developed technology for the closed-loop recycling of PET from textiles. A demonstrator pilot plant is due to be operational in 2021 (19). The principal technology describes a solvent added to blended polyester-cotton textiles at an elevated temperature (for example 100°C) (20). Suitable PET solvents include aromatic esters and aldehydes, as well as dipropylene glycol methyl ether acetate. Hot filtration removes undissolved cellulose from the solution of PET. The polyester is obtained with the use of isopropanol acting as an antisolvent. Characterisation of the separated polymers is not available, aside from a statement in the patent that the recovered PET has an identical infrared (IR) spectrum to the virgin material (20). Other works indicate that dissolution-precipitation cycles do not impact the polymer molecular weight, but the crystallinity of the recyclate is significantly lower than virgin PET (21). Here N-methyl-2-pyrrolidone (NMP) was used as the solvent and an alkane for the antisolvent. The use of reprotoxic NMP is not sustainable in the presence of tightening regulations (22) and the forced precipitation by antisolvents is probably responsible for the crystallinity of the isolated polymer. Greater attention is needed at the precipitation phase of the process to produce higher quality polymers.

Worn Again has also patented a procedure for recycling PET packaging, including drinks bottles (23). The key innovation that distinguishes this from mechanical recycling is the removal of dyes that otherwise dictate the quality of recyclate (Figure 1). Synthetic textiles are also appropriate feedstocks for this process. Coloured plastics and dyed textiles are far less valuable as a secondary feedstock for products compared to uncoloured transparent materials. The Worn Again technology is based on a solvent or temperature switch to firstly dissolve any dyes (but not PET) and then the polymer is dissolved at a higher temperature or in a different solvent. It is important that the first solvent swells but does not dissolve PET under the operating conditions. For instance, dyes are dissolved in ethyl benzoate at 120°C and liberated from the swollen plastic. After removing the dye solution, a second batch of ethyl benzoate is added at 180°C to dissolve the polymer. It is necessary to implement this second step to remove any insoluble impurities. For this to be economically viable the solvent will need to be recycled and in this regard the process is simplified by using the same solvent throughout. A PET recovery of 96% is satisfactory.

Fig. 1.

Simplified schematic of the Worn Again PET recycling process; A contaminated and dyed PET collected; B dye dissolved (low temperature); C contaminated PET filtered; D dye solution removed and solvent reclaimed; E PET dissolved (high temperature); F contamination filtered; G PET solution cooled to precipitate PET and reclaim solvent; H recycled PET

Simplified schematic of the Worn Again PET recycling process; A contaminated and dyed PET collected; B dye dissolved (low temperature); C contaminated PET filtered; D dye solution removed and solvent reclaimed; E PET dissolved (high temperature); F contamination filtered; G PET solution cooled to precipitate PET and reclaim solvent; H recycled PET

Solvents described as able to dissolve PET are provided in Table I (20, 23). Due to solvent residue potentially trapped in the recyclate, it is important to consider toxicity as part of solvent selection. The CHEM21 solvent selection guide categorises hazards into safety (S), health (H) and environmental (E) impact using a 1–10 scale where high scores reflect severe hazards (24). Benzyl acetate and ethyl benzoate are listed as having the best health and safety profile. High boiling solvents such as these are penalised in the environmental category because recovery by distillation is energy intensive. Depending on the proposed applications of the recycled PET, residual solvent limits for food contact applications or other regulations must also be considered.

Table I

Patented Examples of PET Solvents, Listed Alongside Hazards (Data Compiled From REACH Registration Dossiers and Safety Datasheets)

Solvent Hazards S H E
Benzaldehyde Harmful if swallowed or in contact with skin. Causes skin irritation 2 2 5
Benzyl acetate Harmful to aquatic life with long lasting effects 1 1 7
Butyl benzoate Harmful if swallowed. Causes skin irritation. Causes serious eye irritation 1 2 7
DMEU Harmful if swallowed. Causes serious eye damage. Suspected of damaging fertility or the unborn child. May cause damage to organs through prolonged or repeated exposure 1 6 7
Dipropylene glycol methyl ether acetate Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation 1 2 5
Ethyl benzoate No reported hazards 1 1 7
Methyl benzoate Harmful if swallowed 1 2 5
Cyclohexanonea Flammable liquid and vapour and is harmful if inhaled 3 2 5
Ethyl acetatea Highly flammable liquid and vapour, causes serious eye irritation and may cause drowsiness or dizziness 5 3 3

Ultimately any disruptive PET recycling technology needs to provide significant advantages over efficient and widely practiced conventional mechanical recycling processes. The ability to separate combinations of materials is a crucial aspect of solvent-based recycling. With still much to be done to improve recovery rates of easier to recycle products, new technologies will only become commonplace if there is a political will to approach very high, near complete recycling rates, including composites.

Solvent-Based Polylactic Acid Recycling

Recycling techniques primarily aim to preserve the chemical structure of materials, but polyesters, with their susceptibility to hydrolysis and alcoholysis, are also possible to depolymerise into monomers. Alcoholysis of PET is a favourable chemical recycling approach because its reaction with ethylene glycol produces bis(2-hydroxyethyl) terephthalate as an appropriate monomer to remake PET. Alternatively methanol will produce dimethyl terephthalate and ethylene glycol which can be combined as they are to produce virgin PET (25). Hydrolysis creates an aqueous solution of terephthalic acid and ethylene glycol which thermodynamically discourages esterification.

Chemical recycling is appropriate when other recycling methods produce a poor quality recyclate. This could be due to contamination that is possible to remove during chemical recycling or because the polymer is prone to decomposition. PLA is thought to be responsible for both these issues by the recycling industry. As a biodegradable polymer, mechanical recycling causes degradation into shorter fibres and as a polyester it is also likely to contaminate PET recyclate. However, PLA is suited to chemical recycling. Hydrolysis or alcoholysis produces a single monomer and it is more rapidly decomposed than PET. This means PET waste destined for recycling can be pretreated to remove any PLA by chemical recycling. It has also been shown that mixtures of PLA and PET can be sequentially chemically recycled into their respective monomers in a two-step process so that the polymers no longer contaminate one another (Figure 2) (26). This concept proves useful where conventional sorting techniques (such as near-IR) cannot distinguish between polyesters (27), although new analytical systems are being developed to address this (28).

Fig. 2.

Two step chemical recycling of PLA-PET mixed waste; A co-collected PET and PLA; B zinc acetate catalysed alcoholysis of PLA; C filtration of methyl lactate solution; D isolation of methyl lactate after evaporation of excess methanol; E PET recovered; F zinc acetate catalysed alcoholysis of PET; G isolation of bis(2-hydroxyethyl) terephthalate

Two step chemical recycling of PLA-PET mixed waste; A co-collected PET and PLA; B zinc acetate catalysed alcoholysis of PLA; C filtration of methyl lactate solution; D isolation of methyl lactate after evaporation of excess methanol; E PET recovered; F zinc acetate catalysed alcoholysis of PET; G isolation of bis(2-hydroxyethyl) terephthalate

Although recycling PET mechanically without the need for depolymerisation or solvents is the prevailing technology, interest in alternatives is increasing, for example by Carbios, France and DEMETO, EU Framework Programme for Research and Innovation Horizon 2020. The understanding of PLA chemical recycling is arguably more advanced, but commercialisation is constrained by the small market share of PLA and the types of product it is used in. Many PLA containing products are designed for composting at end of life (for instance, plastic lined disposable coffee cups, transparent films for food packaging and other applications). As a bio-based polymer, PLA films are suitable for composting in a circular economy (if other end of life options that preserve more value are not accessible) as there is no net loss of material or emissions from a material perspective. Having said that, there are also many other components and articles made of PLA that will not biodegrade in the conditions provided by industrial composting units (PLA is not suitable for home composting). Thicker PLA materials, such as those that result from three-dimensional (3D) printing with PLA filaments are unlikely to be adequately decomposed by biodegradation on a viable timespan. The possibility that PLA is collected together with PET waste is increasing with the advent of reusable PLA drinks bottles, creating a reason to consider chemically recycling PLA.

Zeus Industrial Products, USA, has patented a process for depolymerising PLA using conditions where PET is unreactive (29). An inert solvent (chloroform) is added to the polymer, along with reactant (methanol) and catalyst (tin dioctanoate) to complete depolymerisation at 57°C. Disadvantages of this process include the use of chloroform, which is toxic if inhaled and suspected of causing cancer and reprotoxicity (24). Full depolymerisation also requires several hours (30).

The Futerro LOOPLA® process (a joint enterprise formed by Galactic, Belgium and Total, France) is another method for chemically recycling PLA. The company has expertise in PLA production as well as its hydrolysis and alcoholysis at end of life. Either chemical recycling method is potentially able to remake a feedstock suitable for PLA production (31). Hydrolysis can occur in a solution of PLA in ethyl lactate at 130–140°C (32). Ethyl lactate is a significantly less hazardous solvent than the chlorinated solvents that are often used to dissolve PLA and other polyhydroxyalkanoates (24, 33). Without the addition of a catalyst, 97% recovery of lactic acid (isolated by crystallisation) is achieved with minimal hydrolysis of the solvent. Potential contamination by PE, PP or PET is resolved because ethyl lactate does not dissolve these polymers, which can be used advantageously to separate PLA from other plastic wastes by hot filtration. If ethanol is added to the recycling process instead of water, alcoholysis occurs (34). The product is identical to the solvent, ethyl lactate, and so separation is simplified. Distillation removes excess ethanol and residues (such as pigments and contamination). An acid catalyst is required and triazabicyclodecene is preferred.

An issue with the described recycling procedures is the product (lactic acid or its esters) is subject to racemisation which produces inferior polymers with lower crystallinity (12). This must be controlled in order to perform closed-loop recycling. Furthermore, the electricity demand is too high for chemical recycling to compete with mechanical recycling (35, 36). While this is a valid concern for PET, mechanical recycling is not appropriate for PLA anyway due to its degradation (37). The first major barrier preventing chemical recycling of PLA being operated at any appreciable scale is the lack of feedstock and therefore an absence of designated PLA waste collection (38). However, the market growth of PLA products indicates future measures to capture PLA waste will need to be implemented.

Solvent-Based Polyvinylchloride Recycling

Many solvent-based recycling research projects and pilot trials have been successful, but few are viable commercial processes because of the competition from mechanical recycling and in the case of PLA the limited feedstock. The most prominent example of a successful recycling process conducted in a solvent was the VinyLoop® process, yet after 16 years of operation the plant was closed in 2018. It is important to understand the reasons why to ensure more recycling operations do not close and waste materials are not considered a burden and unnecessarily incinerated or landfilled when more value could be obtained from them.

The VinyLoop® process took PVC waste streams, often contaminated with textiles and other materials, and selectively dissolved the PVC in an organic solvent. The PVC was then precipitated by steam-driven evaporation of the solvent which itself was recycled. The PVC was said to be of the same quality as the original material. VinyLoop® was a Solvay, Belgium, technology commercialised as a joint venture in 2002 and ran until 2018 (39). The plant in Ferrara, Italy was established to recycle up to 10,000 tonnes of waste a year, primarily cable insulation (40). In 2008 the plant was updated to treat textile composites as well.

Methyl ethyl ketone (MEK) is a good PVC solvent and in the VinyLoop® process was used with the cosolvent n-hexane (Figure 3) (41). In a typical example of the process, 9.3 kg of 82% MEK, 5% water, 13% hexane was added for every kilogram of PVC. After mixing at 100°C (2.8 bar) for 10 min, a dispersant was added (0.2% relative to PVC of METHOCELTM K100, a cellulose ether). The dispersion agent was needed to make fine particles of PVC. Then the temperature and pressure were reduced and steam injected (3.6 kg per kilogram of PVC). The addition of water allowed evaporation of a MEK-water azeotrope. Precipitation of PVC occurred at 64–65°C, below the boiling point of the azeotrope. Over 99% of the recovered PVC was able to pass through a 1 mm sieve. The water-MEK-n-hexane mixture was also collected. The presence of n-hexane improved the separation of the organic phase from water for reuse. An earlier patent describes the addition to salts to achieve the same effect (42).

Fig. 3.

A simplified schematic of the VinyLoop® process; A collection of PVC containing waste; B selective dissolution of PVC; C filtration of contamination; D steam distillation; E recovery of solvent; F recycled PVC

A simplified schematic of the VinyLoop® process; A collection of PVC containing waste; B selective dissolution of PVC; C filtration of contamination; D steam distillation; E recovery of solvent; F recycled PVC

The PVC waste being processed had been plasticised into flexible products. The VinyLoop® process maintained the additive composition of the PVC, which in theory may be advantageous for closed-loop recycling, but in practice the ability to introduce new additives to create new products for contemporary markets and meet changing regulatory requirements would have been preferable. It was the latter that caused the closure of the VinyLoop® plant. Phthalate esters are used extensively to plasticise PVC. The toxicity of phthalate esters has prompted action by the European Chemicals Agency (ECHA), resulting in a ban on many phthalates, including bis(2-ethylhexyl) phthalate, since 2015 (43). The European Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulation that dictates the nature of bans or restrictions on chemical use requires any company producing, importing, using or isolating bis(2-ethylhexyl) phthalate (present above 0.1%) to have obtained authorisation to do so (44). Recycling of materials containing substances subject to authorisation is also within scope of the REACH regulation. How much this is appreciated, adhered to and policed in Europe is a subject of interesting debate with significant consequences. The operators of VinyLoop® did have authorisation (45), but these permits are time limited, in this case less than three years. As the expiry date of the authorisation drew near, the recycling plant was closed. The expectation is that most companies will stop handling the banned substances and find alternatives where possible because authorisation is very expensive to obtain. For a recycler, they are subject to the nature of waste produced by others, including legacy materials and plastics produced by manufacturers with authorisation to include otherwise banned plasticisers. A further complication is that medical products are exempt from the plasticiser ban and so there is the possibility of materials containing bis(2-ethylhexyl) phthalate still entering recycling streams.

This case study raises some important questions. How much PVC currently in use contains banned plasticisers? Many articles such as the cable insulation that was recycled by VinyLoop® has a long lifetime and was made before the EU phthalate bans were implemented. Can solvents remove additives in a compliant way? This question can be addressed by studying the solubility of PVC and phthalate esters. bis(2-Ethylhexyl) phthalate is a liquid expected to be miscible with a large number of organic solvents. Techniques for phthalate determination use solvent extraction methods, albeit on a small analytical scale. Therefore it is logical to add a pre-step to future recycling methods where phthalates (if present) are extracted by swelling but not dissolving the PVC or by dissolving both polymer and additives but later selectively precipitating the PVC. Distillation, as practiced by VinyLoop®, leaves non-volatile components unseparated (i.e. PVC and bis(2-ethylhexyl) phthalate). A condition of handling substances subject to authorisation in Europe is not to isolate or store refined batches of the chemical(s) in question without a permit. For recycling this is an issue as what can be considered an impurity cannot be removed without destroying it in situ. Incineration or chemical transformation may be suitable and legal approaches.

If a process were to be developed that could remove additives in a compliant way, the cosolvents MEK and n-hexane may no longer be the ideal combination for PVC recycling. This creates scope to reduce the hazards posed by n-hexane in particular. In solvent selection it is important to know what solvents are restricted or subject to authorisation by REACH of course. Recently some ether and chlorinated solvents have been subjected to authorisation and a large number of restrictions on how many others can be used are also in place (22, 33).

Solvent-Based Polyethylene and Polypropylene Recycling

The polyolefins PE (high and low density grades) and PP are produced in greater quantities than any other synthetic plastics. As for PET, mechanical recycling is viable because of the availability of the waste and the quality of the recyclate is appropriate for large markets. However, the high calorific content of these hydrocarbons means they are favoured as a feedstock for energy recovery plants (46). Plastic pyrolysis to make oils suitable for refining into fuels and base chemicals is being investigated as a more flexible alternative to incineration (47). The technology is proven on a multi-tonne scale (48, 49). BASF has now used pyrolysis oils made from waste plastic to feed the steam cracker at its primary chemical production plant (50). This indicates there is tangible interest in diversifying the uses of waste polyolefins.

It is also feasible to recover polyolefins from solution. Pappa et al. found xylene at 85°C dissolves PE but not PP (51). The undissolved PP could be removed by filtration and then the PE precipitated with an antisolvent (propanol). Recovery on a 3 kg scale was greater than 99% (Figure 4). The authors report no loss in performance attributes of the recovered polymers and actually an increase in crystallinity. This is unusual compared to the previous case studies (12, 21). Other research also reports that the elastic modulus of PE and PP increases while other properties are the same or slightly improved after solvent-based recycling (52). One explanation is that while recovery is high, the small losses probably represent the more soluble lower molecular weight polymers with less desirable properties.

Fig. 4.

Separation of polyolefins; A mixed PE and PP feedstock; B selective dissolution of PE; C PP recovered; D filtration to give a PE solution; E addition of anti-solvent; F isolation of PE by filtration

Separation of polyolefins; A mixed PE and PP feedstock; B selective dissolution of PE; C PP recovered; D filtration to give a PE solution; E addition of anti-solvent; F isolation of PE by filtration

Solvent-based recycling can offer a major advantage when it is used for separation of wastes. Extraction of polymers from mixed waste streams with selective solubility has been known for decades (53), but it is not cost competitive with flotation and near-IR sorting. However, multilayer materials cannot be separated effectively with current technology. This must be considered as a design flaw in a circular economy, which if impossible to resolve by product designers must be addressed by recyclers. Multilayer packaging typically contains a film of aluminium and a number of plastic layers, including PE sealing layers. The use of switchable-polarity solvents can delaminate these materials by dissolving the PE (54, 55). The principle of a switchable-polarity solvent is based on a hydrophobic amine that is converted into an ammonium bicarbonate solution with the addition of water and carbon dioxide (Figure 5) (56). The resultant hydrophilic antisolvent precipitates the PE. Releasing the carbon dioxide pressure then reforms the original amine ready for reuse.

Fig. 5.

A schematic of a switchable-polarity solvent being used to process PE; A PE is collected; B hydrophobic amine solvent dissolves PE (water may or may not be present at this stage); C addition of carbon dioxide (and water) forms a hydrophilic solution; D precipitation of PE

A schematic of a switchable-polarity solvent being used to process PE; A PE is collected; B hydrophobic amine solvent dissolves PE (water may or may not be present at this stage); C addition of carbon dioxide (and water) forms a hydrophilic solution; D precipitation of PE

Conclusion

Current policies and investment for waste collection, separation and recycling limit the circularity of materials. Product design, consumer choices and conventional business models also share the blame. Despite academic interest in novel polymers designed to self-heal, rapidly biodegrade or depolymerise on command, they are met with resistance by established petrochemical plastic markets. The major reason is that new, synthetically complex products will be more expensive. The introduction of new plastic materials also increases the complexity of the plastic waste market and that is generally unhelpful for recycling practices. Recycling rejection rates are overall already increasing in the UK, now standing at over 4% of post-consumer material collected from households (57). At end of life, small volume plastics are contamination in PET, PE and PP recycling streams, which increases the likelihood that waste is not returned to use because of the low quality of the recyclate. We see this in the recycling of PET, where the presence of PVC at 100 ppm can cause discolouration and degradation of the recyclate (58). Solvent extraction makes it possible to remove PVC from PET (59), in the same way that it might become necessary to remove PLA from PET waste in the future (27).

The potential of polystyrene recycling is also high (60), but recycling rates of consumer waste are low due to the very few districts willing to collect it. Significant barriers to polystyrene recycling include its smaller market size compared to the other major plastics and its low density. Expanded polystyrene is uneconomical to collect, transport and sort for this reason. A number of solvent-based approaches have been proposed to dissolve and densify polystyrene, which in turn could make recycling more economical. Limonene is an effective solvent (61, 62) and Ran et al. recently reported the use of binary solvent systems to dissolve polystyrene (63). The use of switchable-polarity solvents is also known for this purpose (64), but no commercial plants are operational at this time.

The potential for solvent-based recycling to make a significant contribution to a circular economy depends on willingness to invest in end of life processes that recycle difficult waste streams. Start-up and maintenance costs are certainly higher than a conventional recycling plant. There is a social benefit to recycling composites and layered materials that relates to the avoidance of litter, including topical concerns about ocean pollution and microplastics. Waste management of electrical and electronic equipment is infamous for exports to Africa exploiting vulnerable people and exposing them to toxic substances (65). The Basel Convention now makes this practice illegal. With responsibility now placed on treating this waste domestically, research has shown solvents assist the separation and recovery of the complex and valuable components found in these articles (6669). Removing or at the very least monitoring additives will become hugely important to the recycling industry. Addressing brominated flame retardants is a key step in the reprocessing of electrical and electronic equipment (70, 71). Solvent-based recycling processes have been shown to successfully remove brominated flame retardants from plastics by firstly dissolving the waste and then adding a second solvent to selectively precipitate the polymers (72, 73). Ultimately the possibility of future feedstock shortages and subsequent price increases, coupled with countries’ refusal to accept foreign waste (74), will demand a change to recycling practices beyond simply increasing the capacity of conventional processes. Whether this will occur in the short term or many decades from now depends on the prioritisation of a circular economy in the ambitions of world leaders.

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  • By |2019-10-31T08:02:38+00:00October 31st, 2019|Weld Engineering Services|Comments Off on Closed-Loop Recycling of Polymers Using Solvents

    Changing the world with ISO standards on World Cities Day

    Increasing urbanization worldwide means city living is the future, and digital innovation can help to make that future bright. This is the theme of this year’s World Cities Day and ISO International Standards are at the forefront.

    More than half the world’s population lives in cities, a number which is expected to double by 2050, making it a pressing item on the agenda for all city leaders. The theme of this year’s World Cities Day is “Changing the world: innovations and better life for future generations”, which aims to promote discussion on how increasing urbanization can be an opportunity for sustainable development. A key goal this year is increasing awareness of how digital innovations can be used to achieve this.

    The new digital economy we live in epitomizes the ways in which technology becomes embedded within societies. It includes robotics, artificial intelligence, the Internet of Things, additive manufacturing (or 3D printing), autonomous transport and more. For all this to work, devices need to be built using the same rules, the same communication protocols and data exchange formats that are compatible on a global scale.

    International Standards serve as a platform for the development of digital innovation as they provide a common language based on global best practice that is essential for data interoperability.

    ISO is at the forefront, with many thousands of standards that help to make cities a safe and sustainable place to live. These also contribute directly to the United Nations Sustainable Development Goal SDG 11 for sustainable cities and communities.

    The family of standards ISO 37100, Sustainable cities and communities, for example, provides cities with an overall framework for defining sustainable development objectives as well as a roadmap to achieving them. They cover everything a city must address to become sustainable, such as responsible use of resources, environmental management, health and well-being of citizens, infrastructure, food security, safety and more.

    Another example is intelligent manufacturing, which makes factories smarter, safer and more environmentally sustainable. Improvements to production processes are projected to generate billions of dollars over the next decade and ISO has over 800 International Standards in this field.

    Cybersecurity is also essential for digital innovation to survive and thrive. ISO has nearly 200 International Standards in this area, including the world-renowned ISO/IEC 27000 series for information security management.

    Connected transport is an equally fundamental component of sustainable cities of the future. ISO has over 270 standards in this field and another 70 in development. These include standards for self-driving cars, as well as those supporting electric or hydrogen-powered cars, that will help to make our cities more sustainable through reduced energy use and pollution.

    Find out more about how ISO standards can help create the world’s cities of the future in this informative brochure or contact your national ISO member.

    Building a smart city is highly complex. Learn about how ISO standards help to make cities smarter.
    Sustainable Cities and Communities
    Make cities and human settlements inclusive, safe, resilient and sustainable
    By |2019-10-30T09:08:50+00:00October 30th, 2019|Weld Engineering Services|Comments Off on Changing the world with ISO standards on World Cities Day

    ISO, IEC and ITU’s committee for JPEG receives Emmy Award

    The experts behind the standard for JPEG were recognized with an Engineering Emmy by the US Academy of Television Arts & Sciences at the 71st Engineering Emmy Awards last night.

    An example of cutting-edge innovation, the JPEG has remained one of the leading still-image formats for 27 years, enabling the world to use and share billions of images every day. The experts behind the technology, collectively known as the ISO/IEC and ITU Joint Photographic Experts Group of ISO/IEC JTC 1’s [1] subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, have now been granted an Engineering Emmy for their invaluable contribution to engineering developments.

    The Engineering Emmy is presented to an individual, company or organization for “engineering developments that are so significant an improvement on existing methods or so innovative in nature that they materially affect the transmission, recording or reception of television”.

    In receiving the award, the ISO/IEC and ITU JPEG Group was recognized for its “groundbreaking and game-changing work of lasting value to the television industry”.

    “It is a real pleasure to see the work of our experts recognized in this way,” said Sergio Mujica, Secretary-General of ISO. “This group is at the forefront of innovation and technology in the industry and represents a good example of how standardization work can result in groundbreaking solutions and technologies that impact us all. It is also a great example of fruitful collaboration between many countries and organizations, and I wish to congratulate all of those who were involved.”

    In accepting the award, Mr Teruhiko Suzuki, Chair of ISO/IEC JTC 1/SC 29, said:

    “JPEG is used everywhere, all the time. Every day around the world, a huge number of JPEG images are created, uploaded and shared. It’s a great achievement by the JPEG committee.”

    The JPEG standard, ISO/IEC 10918, Information technology – Digital compression and coding of continuous-tone still images, was first developed in 1992 and now consists of seven parts. These parts cover a wide range of aspects including compliance testing, extensions, the JPEG File Interchange Format (JFIF) and registration authorities.

    To find out more about this technology, please refer to the JPEG Website.

    For further information, see ISO.org or contact your national ISO member.

    1. ISO/IEC JTC 1 is the joint technical committee formed by ISO and its sister organization, the International Electrotechnical Commission (IEC), to serve as a focal point of standardization in information technology.
    By |2019-10-24T08:53:05+00:00October 24th, 2019|Weld Engineering Services|Comments Off on ISO, IEC and ITU’s committee for JPEG receives Emmy Award

    New guidance for standards professionals just published

    Standards touch all areas of our lives, so standards developers are needed from all sectors of society. New international guidance for the competences required of standards professionals has just been published to improve and harmonize the skills required and attract new talent into the standards community.

    From company specifications to national, regional and international guidelines, there are many types of standards and many thousands, if not millions, of standards professionals working on them. While the work involved to develop them varies, there are many common skills required. Varying guidance exists, such as national qualifications programmes in several countries and the Asia-Pacific Economic Cooperation’s APEC Education Guidelines for standards professionals No 5 and No 6.

    Recognizing the need for international guidance, and to facilitate access into the standards development profession, ISO has now developed a two-part International Workshop Agreement (IWA) that sets out the competences for organizations worldwide.

    IWA 30-1, Competence of standards professionals – Part 1: In companies, specifies the knowledge, skills and attributes required of those working in standardization within companies while IWA 30-2Competence of standards professionals – Part 2: In standards-related organizations, is applicable to those in organizations involved in any part of the life cycle of standards. The documents cover the structure of tasks and sub-tasks; the common competences; the competences by task and a career roadmap for standards professionals.

    Donggeun Choi, Chair of the ISO technical committee that developed the standards, said there are millions of jobs in standardization around the world, and newcomers to the standards community are always required.

    “Standards are ever evolving as they are intended to respond to ever-changing market needs,” he said. “These standards will help new professionals enter into the world of standards and existing ones to refine and improve their skills.”

    IWA 30-1 and IWA 30-2 are available from your national ISO member or through the ISO Store.

    By |2019-10-23T08:13:14+00:00October 23rd, 2019|Weld Engineering Services|Comments Off on New guidance for standards professionals just published
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