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Transcript of GREEN CHEMISTRY
kg of valuable product
to one hundred
of waste often
Dr_ Poul Anastas
Found the solution
" the design of chemical products and processes that reduce or eliminate the use and generation of hazardous substances."
Chemists Paul Anastas and John Warner,
who defined green chemistry as
The study of
Your First impression
The green chemicals
prevent pollution to all areas of chemistry
the treatment of pollutants after they are formed
Importance to Industry
The Triple Bottom Line
The Concept of Atom Economy
How many of the atoms of the reactants are incorporated into the final desired product ?
how many are wasted by incorporation into by-products?
Ibuprofen is the active ingredient in many analgesic and inflammatory drugs with
very high sales.
Synthesis of ibuprofen
formulated 12 principles of
hemistry in 1998
guidelines for chemists.
THE TWELVE PRINCIPLES OF
revention of wastes
A raw material or feedstock should be renewable rather than depletable.
mit derivatisation steps
Unnecessary derivatization (use of blocking groups, protection/de-protection, and temporary modification of physical/chemical processes) should be minimised or avoided if possible,
More derivatives involve
Generate more waste products
Higher Cost of Products
egradable chemical products
Chemical products should be designed so that at the end of their function they do not persist in the environment and break down into innocuous degradation products.
se safe synthetic methods
. Use catalysts, not stoichiometric reagents: Minimize waste by using catalytic reactions.
Catalysts are effective in small amounts and can carry out a single reaction many times.
used in excess and carry out a reaction only once.
Increase energy efficiency
Run chemical reactions at room temperature and pressure whenever possible.
Real-time analysis For pollution prevention
ery few auxiliary substances
Avoid using solvents, separation agents, or other auxiliary chemicals. If you must use these chemicals, use safer ones.
Maximize atom economy
ow toxicity of chemical product
Design chemical products that are fully effective yet have little or no toxicity.
Instead of using Synthetic chemicals use natural one which can be extracted from Natural Resources.
generate substances that possess little or no toxicity to people or the environment
Green chemistry Applications
Old and New Synthesis of Ibuprofen
6 step method
3 step method
40% atom economy
77 to 99% atom economy
Non reusable AlCl3 catalyst
Recycled Nickel catalyst
Which principles are applied here???
Adipic acid synthesis
(important starting chemical substance for Nylon)
Synthetic polymers or plastics are everywhere.
all made from
petroleum, a nonrenewable resource.
Eman Fawzy Romieh
a solution to all environmental problems
the most funamental approach to prevent pollution