Inherent Safety at Chemical Sites: Reducing Vulnerability to Accidents and Terrorism Through Green Chemistry
By Paul T Anastas and David G Hammond
()
About this ebook
Inherent Safety at Chemical Sites: Reducing Vulnerability to Accidents and Terrorism Through Green Chemistry highlights the use of green chemistry principles to identify and address serious threats and potential consequences caused by accidental and deliberate industrial chemical releases. Through valuable case studies, the book suggests wholesale replacements of hazardous chemicals with benign and inherently safer, or "greener," materials. More than physical security barriers and plans, such preventative measures better guarantee the safety of industrial employees and nearby residents.
This valuable primer begins with an introduction to the concepts of green chemistry and outlines the various ways that a green approach to chemical design, production, and management is not only good for the planet, but also serves to protect people and infrastructure from terrorist acts. Specific examples and case studies are cited to illustrate what has been done to advance this cause, and offer guidance to those decision-makers who similarly aspire to greater safety and security for the people and resources they manage.
- Addresses security at chemical plants, manufacturers, water utilities and other facilities utilizing and storing hazardous chemical
- Provides practical suggestions and insightful case studies for green chemistry innovations from replacement processes and new technologies
- Covers multiple important chemicals and categories, including: Chlorine, Hydrogen cyanide, Hydrogen fluoride (hydrofluoric acid), Phosgene, Sulfur Dioxide, Sulfuric Acid, Ammonia, Benzene, Pesticides, and cleaning technologies
Paul T Anastas
Yale Center for Green Chemistry and Engineering, New Haven, CT, USA
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Inherent Safety at Chemical Sites - Paul T Anastas
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Chapter 1
Introduction
Abstract
This chapter introduces the definition and scope of the field of green chemistry, and how the method for designing inherently safer products and processes has the side benefit of helping to protect America’s extensive chemical infrastructure from the potential for accidents and the threats of terrorism. This chapter further describes the 12 principles of green chemistry as a design framework. The chapter closes with examples of innovative contributions to recently come from the field of green chemistry.
Keywords
Green chemistry; hazardous substances; terrorism; 12 principles of green chemistry; trends in green chemistry; inherently safer materials; inherently safer technology
Since its inception as a conscious strategy in the early 1990s, green chemistry has gained recognition as a reliable and cost effective means for reducing the environmental impacts of industry. But a less anticipated side benefit of green chemistry methods has been that they also help to protect America’s extensive chemical infrastructure from the threats of terrorism. A company’s drive to save power, reduce waste, or use and store smaller quantities of hazardous chemicals will dictate modifications that also tend to reduce vulnerability to catastrophic accidents perpetrated by would-be saboteurs. At a time when concern over terrorism is running high, decision-makers in the chemical industry are wisely examining how they can incorporate green chemistry techniques to decrease their exposure to risk.
Across the United States, approximately 15,000 chemical plants, manufacturers, water utilities, and other facilities store and use extremely hazardous substances that would injure or kill employees and residents in nearby communities if suddenly released. Approximately 125 of these facilities each put at least 1 million people at risk; 700 facilities each put at least 100,000 people at risk; and 3000 facilities each put at least 10,000 people at risk, cumulatively placing the well-being of more than 200 million American people at risk,¹ in many cases unnecessarily. The threat of terrorism has brought new scrutiny to the potential for terrorists to deliberately trigger accidents that until recently the chemical industry characterized as unlikely worst-case scenarios. Such an act could have even more severe consequences than the thousands of accidental releases that occur each year as a result of ongoing use of hazardous chemicals.
The Department of Homeland Security and numerous security experts have warned that terrorists could turn hazardous chemical facilities into improvised weapons of mass destruction. As far back as 1999, the Agency for Toxic Substances and Disease Registry warned that industrial chemicals provide terrorists with …effective, and readily accessible materials to develop improvised explosives, incendiaries and poisons.
²,³
The prospect of a deliberate act targeting chemical production or storage sites is frightening for its potential—via release and dispersal of noxious chemicals into our air, soil, and waterways—to harm people, property, and resources. Furthermore, the long-term impacts and consequences of such an incident could go far beyond the direct initial damage of a hostile strike.
Fortunately, ingenuity has bred novel ways to lower our vulnerability to terrorist attack, spawning strategies that supersede the mere strengthening of physical barriers. Whereas fences, walls, alarms, and other physical safety measures will always have some possibility of failure—particularly when the enemy wields weapons like airplanes and bombs—the wholesale replacement of hazardous chemicals with benign and inherently safer, or greener
materials is a preventative measure that is guaranteed to provide fail-safe results. A hazardous chemical that is no longer present can no longer be turned into a weapon to be used against you. It is estimated that employing alternative chemicals at the nation’s 101 most hazardous facilities could improve the security of 80 million Americans.⁴
Experts in the field of risk assessment are, therefore, concluding that green chemistry methods, though initially motivated by environmental or sometimes economic concerns, also offer the important additional benefit of decreasing our exposure to the threats of terrorism.
This book briefly introduces the concepts of green chemistry, and shows the various ways that a green approach to chemical design, production, and management is not only good for the planet, but also serves to protect people and infrastructure from terrorist acts. Specific examples and case studies are cited to illustrate what has been done to advance this cause, and offer guidance to those decision-makers who similarly aspire to greater safety and security for the people and resources they manage.
By focusing primarily on tangible case studies, we describe here the green chemistry innovations implemented by each company or facility. Where possible, we include details comparing the new technology to previous or conventional methods, and broadly quantify the improvements in terms of hazardous chemicals avoided or people protected. Although the specific details of each chemical process cannot be guaranteed to be accurate, they are presented in good faith and to the best of our knowledge; we encourage interested parties to seek further information directly from the relevant parties or from collaborative industry groups.
1.1 What Exactly is Green Chemistry?
Green chemistry is the design of chemical products and processes in a manner that reduces or eliminates the use and generation of hazardous substances.⁵ The term hazardous
is employed in its broadest context to include physical (e.g., explosion, flammability), toxicological (e.g., carcinogenic, mutagenic), and global (e.g., ozone depletion, climate change) considerations. Green chemistry is an approach to the synthesis, processing, and use of chemicals that inherently reduces risks to humans and the environment.⁶ A concern for both use and generation of hazardous substances is essential because it ensures that the chemist or designer address complete life cycle considerations.⁷
Typical modifications that have proven fruitful in furthering the cause of green chemistry include replacing particularly hazardous chemicals with less problematic alternatives, minimizing the amount of hazardous material needed for a reaction by combining it with a catalyst to increase the effective yield, and manufacturing material on-site or on-demand so as to minimize the amount stored, handled, and transported.⁸
Unlike add-on safety measures such as barriers, locks, employee training, and emergency response systems—which can never be 100% reliable because there is always some potential for a breach or accident—green chemistry techniques that result in a fundamental change in process or materials offer permanent, ensured improvements.
In the words of Trevor Kletz, a pioneer of inherently safe chemical engineering, what you don’t have, can’t leak.
⁹ Likewise, what you don’t have can’t be made the target of a terrorist attack.
The key design principles that drive innovation in the field of green chemistry have been summarized¹⁰ as:
Principles of Green Chemistry
1. Prevention
It is better to prevent waste than to treat or clean up waste after it has been created.
2. Atom Economy
Synthetic methods should be designed to maximize the incorporation of all materials used in the process into the final product.
3. Less Hazardous Chemical Syntheses
Wherever practicable, synthetic methods should be designed to use and generate substances that possess little or no toxicity to human health and the environment.
4. Designing Safer Chemicals
Chemical products should be designed to affect their desired function while minimizing their toxicity.
5. Safer Solvents and Auxiliaries
The use of auxiliary substances (e.g., solvents, separation agents) should be made unnecessary wherever possible and innocuous when