Green Chemistry is about:
1. Waste minimization of source
2. Use of catalysts in place of reagents
3. Using non-toxic reagents
4. Use of renewable resources
5. Improved atom efficiency
1. Green synthesis
• Definition :
green chemistry is the utilization of a set of principles that
reduces or eliminates the use or generation of hazardous substances in
the design , manufacture and application of chemical products.
Green synthesis:
green synthesis describes the techniques to eliminate
them.
Green Chemistry is about:
• Waste minimization of source
• use of catalysts in place of reagents
• Using non-toxic reagents
• Use of renewable resources
• Improved atom efficienciency
2. Why do we need Green chemistry
Chemistry is undeniably a very prominent part
of our daily lives.
Chemical developments also bring new
environmental problems and harmful
unexpected side effects, which result in the need
for ‘greener’ chemical products.
A famous example is the pesticide DDT.
3. The 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 process into
final product.
3. Less Hazardous Chemical Cyntheses:-Whenever 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. Design For Energy Efficiency:- Energy requirements of chemical
processed should be recognized for their environmental and
economic impacts and should be minimized.
4. Principles of Green Chemistry
• 6 Use of Renewable Feedstocks:-
–A raw material or feedstock should be renewable
rather than depleting whenever technically and
economically practicable.
• 7 Inherently Safer Chemistry for Accident
Prevention:-
–Substances and the form of a substance used in a
chemical process should be chosen to minimise
the potential for chemical accidents, including
releases, explosions, and fires.
5. The major uses of GREEN CHEMISTRY
Energy
Global Change
Resource Depletion
Food Supply
Toxics in the Environment
6. Conclusion
• Green chemistry Not a solution to all
environmental problems But the most
fundamental approach to preventing
pollution.