Explain the principles of green chemistry
Answers
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 affect 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.
Answer:
when the waste and pollution the society generate exceeds the earth's natural capacity for dealing with it, the green chemistry approach plays an important role.
Explanation:
1) To reduce or eliminate the use aur generation of hazardous substances in the design, manufacturing and use of chemical products by promoting innovative chemical technologies.
2) Capital expenditure required for prevention of pollution is controlled by the use of green chemistry. Sincegreen chemistry incorporates and promotes pollution prevention practices in the manufacturing process of chemicals it helps industries ecology.
3) Green chemistry helps to protect the presence of ozone in the stratosphere. Ozone layer is essential for survival of life on earth.
4) global warming (Greenhouse effect) is controlled by green chemistry. At present it is the beginning of green Revolution.It is an exciting time with the new challenge for chemist involved with the discovery, manufacturing and use of chemicals.Green chemistry help us to save environment in save earth, which is important for our future.