From basic information of green chemistry, its defination and all the 12 principle of green chemistry. Also some applications of green chemistry. And finally the aim of Green chemistry.

5. 3.Avoid the use and formation of toxic materials.
This principle aims to develop new methodoloigies which will make
use of environment friendly starting materials and also avoid the
formation hazardous or toxic by-products.

6. 4.Design and use of non-toxic chemicals or having
minimum toxicity
Chemicals used for various activities should be non-toxic
but should have the efficacy to function. Many chemical
industries use toxic substances as starting material or
sometimes the starting materials are derived from toxic
substances.
For ex.

7. 5.Minimum use of auxiliary substances
This principle aims to use green solvents such as water, super critical
co2 in place of volatile halogenated organic solvents like
Dichloromethane , chloroform for chemical synthesis.
Some times solvent free synthesis is preferred e.g. Claisen
rearrangement can be earned out in solid phase.
o-Allyl phenol
Allyl phenyl
ether

8. 6.Minimum energy consumption
 To save energy synthetic procedures need to be
modified. By reducing the temperature and pressure to
ambient conditions a large amount of energy can be
saved.
 Biocatalysts such as enzymes are catalysts which can
work at ambient temperature.

9. 7.Use of Renewable sources
 The continuous use of non-renewable source have
depleted them beyond repairs and the future generation
will be deprived of these. This principle promotes the use
of raw materials from renewable sources, wherever
possible.

10. 8.Minimisation of steps

11. 9.Use of catalytic reagents
Catalytic reagents are much effective than
stoichiometric reagents in chemical synthesis.
Use of catalytic reagent reduces the energy required
for a reaction to proceed thereby saving energy. It
also reduces burden on the environment.

12.  Benzene is starting material for
Adipic acid. Benzene is highly Carciongenic,
being a voc, it pollutes air.

13. 10.Degradation of waste
 At the end of reaction the products
that will be released in the
environment or discarded as wastes
should degrade or break down
rapidly into harmless products i.e.
after they should not remain in the
environment.
Ex. Polymers which degrade
Photochemically can be used as
starting materials for some products.

14. 11.Monitoring the generation of
hazaradous substance

16. This has following advantages
 100% atom efficiency can be achieved.
 Catalysed reactions are faster and therefore energy is
saved.
 Better yields of products are obtained.
 Maximum selectively can be achieved.
 Maximum utilization of starting materials and
minimum generation of waste. Example of such
reactions showing 100% atom economy.

18. Major uses of green chemistry
Energy
Global change
Resource depletion
Food supply
Toxics in the environment

22. conclusion
Green chemistry not a solution to all
ENVIRONMENTAL problems but the most
fundamental approach to prevent POLLUTION

23. Use of safer substances
 Processes and substances used in chemical industries
should ne selected in s such a way that they can
minimise the occurrence of the chemical accidents,
explosions, fires and hazardous emissions.
 If the chemical process uses gaseous substance,
posssiblity of accidents, including explosion is
relatively higher compared to when using; non volatile
liquids or solids.