amit greeen chemistry

7/25/2019 Amit Greeen Chemistry

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GREEN CHEMISTRY

DEFINITION Green Chemistry is the utilisation of a set of principles that reduces or eliminates

the use or generation of hazardous substances in the design, manufacture andapplication of chemical products.

GREEN CHEMISTRY IS ABOUT Waste Minimisation at Source

Use of Catalysts in place of Reagents

Using NonTo!ic Reagents

Use of Rene"a#le Resources

Impro$e% &tom Efficiency Use of Sol$ent 'ree or Recycla#le En$ironmentally (enign Sol$ent systems


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Green Chemistry Is About

Cost

Waste

Materials

Ha)ar%

Ris*

Energy


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Chemistry is un!eni"b#y " $ery %rominent

%"rt o& our !"i#y #i$es

Chemi'"# !e$e#o%ments "#so brin( ne)

en$ironment"# %rob#ems "n! h"rm&u#

une*%e'te! si!e e&&e'ts+ )hi'h resu#t in the

nee! &or ,(reener- 'hemi'"# %ro!u'ts A &"mous e*"m%#e is the %esti'i!e DDT

W+y %o "e nee% Green C+emistry ,


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Green c+emistry#oo.s "t %o##ution %re$ention on

the mo#e'u#"r s'"#e "n! is "n e*treme#y im%ort"nt

"re" o& Chemistry !ue to the im%ort"n'e o&

Chemistry in our )or#! to!"y "n! the im%#i'"tions

it '"n sho) on our en$ironment

The Green C+emistry%ro(r"m su%%orts thein$ention o& more en$ironment"##y &rien!#y

'hemi'"# %ro'esses )hi'h re!u'e or e$en

e#imin"te the (ener"tion o& h"/"r!ous subst"n'es

This %ro(r"m )or.s $ery '#ose#y )ith the t)e#$e%rin'i%#es o& Green C+emistry.


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1. PreventionIt is better to prevent waste than to treat or clean up waste after it has been created.

2. Atom EconomySynthetic methods should be designed to maximise the incorporation of all materialsused in the process into the final product.

. !ess "azardous Chemical #ynthesisWherever practicable, synthetic methods should be designed to use and generatesubstances that possess little or no toxicity to people or the environment.

$. %esigning #afer ChemicalsChemical products should be designed to effect their desired function while minimisingtheir toxicity.

&. #afer #olvents and Au'iliariesThe use of auxiliary substances (e.g., solvents or separation agents should be madeunnecessary whenever possible and innocuous when used.

(. %esign for Energy Efficiency!nergy re"uirements of chemical processes should be recognised for their environmentaland economic impacts and should be minimised. If possible, synthetic methods should beconducted at ambient temperature and pressure.

The 01 2rin'i%#es o& Green Chemistry 30456


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) *se of +eneable -eedstoc.s

# raw material or feedstoc$ should be renewable rather than depleting whenever technically andeconomically practicable.

/ +educe %erivatives%nnecessary derivati&ation (use of bloc$ing groups, protection'deprotection, and temporary modification

of physical'chemical processes should be minimised or avoided if possible, because such steps re"uire

additional reagents and can generate waste.

0 CatalysisCatalytic reagents (as selective as possible are superior to stoichiometric reagents.

1 %esign for %egradationChemical products should be designed so that at the end of their function they brea$ down into innocuous

degradation products and do not persist in the environment.

11 +ealtime Analysis for Pollution Prevention#nalytical methodologies need to be further developed to allow for realtime, inprocess monitoring and

control prior to the formation of ha&ardous substances.

12 3nherently #afer Chemistry for Accident PreventionSubstances 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.

The 01 2rin'i%#es o& Green Chemistry 374016


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-It is #etter to pre$ent "aste t+an to

treat or clean

up "aste after it is forme%

emical

Process


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C#"ssi' Route to Ibu%ro&en

#c)*

#lCl+

C*C+

Cl, #c*, #l Waste

ClC)C*

)!t

-a*!t

*!t*

)C

Cl

)* '

*C

#c*

-)*

*--

)* '

*)C

-+


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Hoe'hst Route To Ibu%ro&en

*

/

#c*

#c)*

)' -i

*

C*, 0d

*)C


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-T+e use of au!iliary su#stances /e.g. sol$ents0

separation agents0 etc.1 s+oul% #e ma%e

unnecessary"+ere$er possi#le0 an% innocuous "+en use%


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-Energy re2uirements s+oul% #e recogni)e% fort+eir en$ironmental impacts an% s+oul% #e

minimi)e%.

Synt+etic met+o%s s+oul% #e con%ucte% at

am#ientpressure an% temperature


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Heating

CoolingStirring

3istillation

Compression

4umping

Separation

Energy Re2uirement

/electricity1(urn fossil

fuel

C56to

atmosp+ere

G75(&7

W&RMING


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-& ra" material of fee%stoc* s+oul% #e

rene"a#lerat+er t+an %epleting "+ere$er tec+nically

an%

economically practical

Nonrene"a#le Rene"a#le


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Resource 3epletion

1 2enewable resources can be madeincreasingly viable technologicallyand economically through greenchemistry.

(iomass

Nanoscience

Solar

Car#on%io!i%e

Waste utili)ation


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4oly lactic aci% /47&1 for plastics pro%uction


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4oly+y%ro!yal*anoates /4H&8s1


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Ener(y

G#ob"# Ch"n(e Resour'e De%#etion

Foo! Su%%#y

To*i's in the En$ironment

The m"8or uses o& GREEN CHEMISTRY


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Energy

The vast ma3ority of the energy

generated in the world today is

from nonrenewable sources that

damage the environment.Carbon dioxide

4epletion of *&one layer !ffects of mining, drilling, etc

Toxics


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Energy

5reen Chemistry will be essential in developing the alternatives for energy

generation (photovoltaics, hydrogen, fuel

cells, biobased fuels, etc. as well as

continue the path toward energy efficiency

with catalysis and product design at the

forefront.


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Glo#al C+ange

Concerns for climate change,

oceanic temperature, stratospheric

chemistry and global distillation canbe addressed through the

development and implementation

of green chemistry technologies.


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Resource 3epletion

4ue to the over utili&ation of non

renewable resources, natural

resources are being depleted at an

unsustainable rate.

/ossil fuels are a central issue.


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Resource 3epletion

2enewable resources can be madeincreasingly viable technologically and

economically through green chemistry. 6iomass -anoscience 7 technology Solar

Carbon dioxide Chitin Waste utili&ation


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'oo% Supply

While current food levels are sufficient,

distribution is inade"uate

#gricultural methods are unsustainable /uture food production intensity is

needed.

5reen chemistry can address manyfood supply issues


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'oo% Supply

5reen chemistry is developing8 0esticides which only affect target

organisms and degrade to innocuousbyproducts. /ertili&ers and fertili&er ad3uvants that

are designed to minimi&e usage while

maximi&ing effectiveness. 9ethods of using agricultural wastes

for beneficial and profitable uses.


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To!ics in t+e En$ironment

Substances that are toxic to humans,

the biosphere and all that sustains it,

are currently still being released at acost of life, health and sustainability.

*ne of green chemistry:s greatest

strengths is the ability to design forreduced ha&ard.


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4re$ention 9 Re%uction

Recycling 9 Reuse

Treatment

3isposal

2o##ution 2re$ention Hier"r'hy


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Conclusion

Green chemistry 4ota solution

to all environmental problems 5utthe most fundamental approach to

preventing pollution.


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T+an* you


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amit greeen chemistry

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