What is Green Chemistry?
Do you know the word ”green chemistry”？
It can also be called “environmentally friendly chemistry” or something similar.
Green Chemistry is a practical way of thinking about how people who make chemicals can make things in an environmentally friendly way.In Japan, GSCN defines Green Sustainable Chemistry (so called Green Chemistry) as “the chemistry which is friendly for human and environment and supports the development of sustainable society.”
In this way of thinking, environmental negative effects (risk) is regarded as “ risk = hazard × exposure“.
It focuses not on the way of reducing the exposure, but on the hazard management that reduce the risk of health and environment by reducing the fundamental hazard in the making process of the products. In easier words, it is the way of thinking not to drive the exit after making but to stop the born of dirty itself by using of the subjects with less hazard in na making process.Simply put, the idea is to cut off the generation of contamination itself by using less hazardous materials at the manufacturing stage, rather than tinkering with the treatment outlets after making the product.
12 Principles of Green Chemistry
- Prevention
It is better to prevent waste than to treat or clean up waste after it has been created. - Atom Economy
Synthetic methods should be designed to maximize the incorporation of all materials used in the process into the final product. - 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. - Designing Safer Chemicals
Chemical products should be designed to effect their desired function while minimizing their toxicity. - Safer Solvents and Auxiliaries
The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used. - Design for Energy Efficiency
Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure. - Use of Renewable Feedstocks
A raw material or feedstock should be renewable rather than depleting whenever technically and economically practicable. - Reduce Derivatives
Unnecessary derivatization (use of blocking groups, protection/ deprotection, temporary modification of physical/chemical processes) should be minimized or avoided if possible, because such steps require additional reagents and can generate waste. - Catalysis
Catalytic reagents (as selective as possible) are superior to stoichiometric reagents. - Design for Degradation
Chemical products should be designed so that at the end of their function they break down into innocuous degradation products and do not persist in the environment. - Real-time analysis for Pollution Prevention
Analytical methodologies need to be further developed to allow for real-time, in-process monitoring and control prior to the formation of hazardous substances. - Inherently Safer Chemistry for Accident Prevention
Substances and the form of a substance used in a chemical process should be chosen to minimize the potential for chemical accidents, including releases, explosions, and fires.
(Reference)
Anastas, P. T. and Warner, J. C. Green Chemistry: Theory and Practice. Oxford University Press: New York, 1998, p. 30. By permission of Oxford University Press.