2. SOCIETAL IMAGE OF CHEMISTRY:
*Chemistry was once viewed as a field of
innovation resulting in medical
breakthroughs and modern convenience.
*Chemistry is now viewed by many as
fouling the planet.
4. SUGGESTIONS OFFERED BY
GREEN CHEMISTRY :
• It is better to prevent waste than to treat it
• Reduce over consumption of energy
• Reduce waste
• Avoid exploitation of resources
* Reduce the use of auxiliary substances
• Energy required must be recognized for their
impact and reduced
• A raw material of feed stock should be
renewable rather than depleting where ever
technically possible.
5. AIMS OF GREEN CHEMISTRY:
• PREVENTION AND REDUCTION OF
WASTES
• Treatment of wastes
• Disposal of wastes
• Recycle and reuse of wastes.
6. SOLAR ENERGY:
• SOLAR COOKERS AND SOLAR WATER
HEATERS HELPS IN THE REDUCTION
OF USAGE OF FOSSIL FUELS LIKE
• LIQUIFIED PETROLEUM GAS
• KEROSINE
• COAL, etc…
7. BIOMASS ENERGY
• Cow-dung , various plant materials
like the residue after harvesting the
crops, vegetable waste and sewage
are decomposed in the absence of
oxygen to give biogas. It leaves no
residues like ash in woods and
produces no smoke as in charcoal,
coal burning.
8. BIOMASS ENERGY:
• The large-scale utilization of
bio waste and sewage material
provides a safe and efficient
method of waste-disposal besides
supplying energy and manure.
9. BENEFITS OF BIOMASS
• Renewable Feedstock
• Contributes no net CO2 to the
atmosphere
• Conserves fossil fuel leading to a secure
domestic supply
• Platform for making an array of chemical
products from what is otherwise considered
waste.
10. ECO FRIENDLY PLASTICS:
• Eco friendly plastics are also known as
poly lactic acid plastics.
• They are manufactured from corn.
• Corn—starch—unrefined dextrose—
fermentation—lactic acid—monomer—
lactide –polymer—PLA –polymer
modification –fiber, film bottle, thermo
forming.
11. RECENT TRENDS IN GREEN
CHEMISTRY:
• PET recycled from 2 litre soda bottles are
used in new fleece.
• Eliminated chlorine bleach in fabrics
• No azo dyes, reduced formaldehyde
• Glucose is used as an alternative for benzene
in synthesis of Adepic acid.
• Corn based poly lacticacid plastics ae used to
make carpets.
• Diphenyl carbonate is used as an alternative
for phosgene.
12. POLICIES OF GREEN CHEMISTRY
*Prevent waste rather than treating it
*Use renewable sources of energy
• Choose substances so as to minimize the
potential for chemical accidents, including
releases, explosions, and fires.
• Auxiliary substances (solvents, etc.) should
be made unnecessary wherever possible
and innocuous when used.
13. DESIGNING GREEN PRODUCTS:
• Chemical products should be designed to
• Use renewable resources–
preserve efficacy of function while
reducing toxicity, and break down into
innocuous degradation products at the
end of their function so that they do not
persist in the environment.
14. BETTERMENT OF ENVIRONMENT
• Eliminate nearly 100% of emissions in
polymer manufacturing and processing
• 30-40% reduction in wastes
• Reduce 50% usage of plastics
• Replace all solvents and acid based
catalysis that have adverse effects with
solids ,or greener alternatives.
15. TWELVE PRINCIPLES OF GREEN
CHEMISTRY
• Prevention of waste;
*Atom economy;
* Less hazardous chemical synthesis;
• Designing safer chemicals;
• Safer solvents and auxiliaries;
• Energy efficient;
• Renewable feed stocks;
16. • Reduce derivatives;
• Catalysis;
• Design for degradation;
• Real time analysis for pollution prevention;
• Safety.
17. DDT:
*The use of DDT has increased enormously due to its
effectiveness against mosquitoes and lice.
*DDT is one of the effective insecticide .
*It is cheap and less toxic to animals.
*But later it was more toxic to fishes.
*The chemical stability of DDT and its fat solubility
compounded the problem.
*It takes about 8 years to metabolize half of the
amount it assimilates.
18. • THUS GREEN CHEMISTRY HAPPENS
TO BE THE REMEDY FOR VARIOUS
ENVIRONMENTAL PROBLEMS LIKE
SOIL POLLUTION, FOOD CHAIN
MAINTENANCE, WATER AND AIR
POLLUTION.
• LET’S ASPIRE , ASCEND AND ACHIEVE
THE GOALS OF GREEN CHEMISTRY!!!!
