Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

GREEN CHEMISTRY

No description
by

emoo amona

on 30 November 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of GREEN CHEMISTRY

Don't you know that ,
For every
kg of valuable product
there is
to one hundred
of waste often
Toxic waste
But ,
Dr_ Poul Anastas
Found the solution
Green chemistry
Definition
" 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
What's the
Green chemistry
The study of
Your First impression
plant
chemically
Or
The green chemicals
eg.
Alkaloids
Tannins
Or
Environment

Friendly
To
,
and
prevent pollution to all areas of chemistry
rather than
the treatment of pollutants after they are formed
Reduction
waste
Materials
Hazards
Risk
Energy
Cost
Importance to Industry
The Triple Bottom Line
Economic
Social
Environmental
Aim
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?
And
Cake
Ibuprofen
Ibuprofen is the active ingredient in many analgesic and inflammatory drugs with
very high sales.
Green synthesis
Example ,
Synthesis of ibuprofen
Paul Anastas
And
John Warner
formulated 12 principles of
G
reen
C
hemistry in 1998
as
guidelines for chemists.
THE TWELVE PRINCIPLES OF
G
REEN
C
HEMISTRY
P
R
O
D
U
C
T
I
V
E
L
Y
P
revention of wastes
R
enewable Feedstock
A raw material or feedstock should be renewable rather than depletable.
waste utilization
O
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,
As
More derivatives involve

Additional Reagents

Generate more waste products

More Time

Higher Cost of Products

D
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.
U
se safe synthetic methods
. Use catalysts, not stoichiometric reagents: Minimize waste by using catalytic reactions.
C
atalytic reagents
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.
Example :
Polyhydroxyalkalonate (PHA)
Polyhydroxyalkanoates (PHA’s)

Polyhydroxyalkanoates (PHA’s)

Polyhydroxyalkanoates (PHA’s)

Polyhdroxyalkalonates (PHA's)
Catalysts
Stoichiometric reagents
T
emperature,pressure ambient
Increase energy efficiency
:
Run chemical reactions at room temperature and pressure whenever possible.
I
n_process monitoring
Real-time analysis For pollution prevention
V
ery few auxiliary substances
Avoid using solvents, separation agents, or other auxiliary chemicals. If you must use these chemicals, use safer ones.
Atom
E
conomy
Maximize atom economy
L
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.

Y
es,it's safe
generate substances that possess little or no toxicity to people or the environment
Finally ,
Green chemistry Applications
1.
Ibuprofen synthesis
Remember
Old and New Synthesis of Ibuprofen

Old synthesis
1960
1990
6 step method
3 step method
40% atom economy
77 to 99% atom economy
Non reusable AlCl3 catalyst
Recycled Nickel catalyst
high energy
lower energy
Which principles are applied here???
Quiz
2.

Adipic acid synthesis
(important starting chemical substance for Nylon)
3.

Polymers
Synthetic polymers or plastics are everywhere.
all made from
petroleum, a nonrenewable resource.

Thanks to
Drs :
Eman Mahmoud
Eman Khaled
Ahmed Elhagar
Ahmed Ismail
Aya mohamed
Eman Fawzy Romieh
Conclusion
Green chemistry
Not

a solution to all environmental problems
But
the most funamental approach to prevent pollution
Full transcript