green chemistry presentation vce units 1 &2 2015

7/25/2019 Green Chemistry Presentation VCE Units 1 &2 2015

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Green Chemistry is theusage of a set ofprinciples

It decrease or remove

the use or generationof hazardoussubstances in the

design, manufactureand application ofchemical products.


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Prevent Waste Design safer chemicals and products Design less hazardous chemical syntheses Use renewable raw materials Use catalysts, not stoichiometric reagents Avoid chemical derivatives Minimise the potential for accidents Maximize atom economy Use safer solvents and reaction conditions Increase energy efficiency Design for degradation Analyze in real time to prevent pollution


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Solvents and mass separation agentsmatter a lot to the chemistry all thechemical process and the overall"greenness" of the reaction.

It drive most of the energyconsumption in a process. Such as

intermittently heated, distilled,cooled, pumped, mixed, distilledunder vacuum, filtered, etc. And

that's before they may or may not berecycled. If they're not recycled, theyare often incinerated.


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Harmless and natural solvent

is accepted by almost allindustries.

is the cheapest and safersolvent as well as somereactions work well in water.

Water

HOH

Great organic solvent

Nontoxic and renewableEthanolCH3CH2OH


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Nail Polish

Paint Fuels

Acetone Toluene

Examples of solvents in industries


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Nontoxic

NonflammableEasy to manufacture


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Solvents from biomass and food waste

BioBased Solvent Molecules


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Co2 at below its Triple Point it

is gas.

Above the Triple Point as the

temperature goes up it forms

Liquid

As the temperature rises above

the critical point(7400kPa) it

forms supercritical fluid

Supercritical CO2(sCO2) acts

like a gas in having highdiffusion rates

As liquid has high density and

dissolving power


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sCO2 is nonpolar, but unlike many

traditional nonpolar solvents it is not

toxic.

It extract waxes, natural products andliquid crystals.


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It supports (principle 10)(It is not

harmful substance and after use do

not accumulate in the environment)

and can be recovered.


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http://www.acs.org/content/acs/en/greenchemistry/whatisgreenchemistry/principles/greenchemistryprinciple5.html

https://www.google.com.au/search?q=use+safer+solvents+and+reaction+conditions&biw=1366&bih=643&source=lnms&tbm=isch&sa=X&sqi=2&ved=0CAYQ_AUoAWoVChMIkaOkmNKjyAIVIeKmCh3tngXY#tbm=isch&q=safer+solvents+and+reaction+conditions&imgrc=ptv2tw_4JtF4RM%3A

https://prezi.com/efrvhqgwnmhe/greenchemistryusesafersolventsreactionconditions/#

http://www.york.ac.uk/chemistry/research/green/research/areas/altsolvents/

http://uvachemistry.com/2015/08/07/greenchemistryandtheuseofsupercriticalcarbondioxide/


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green chemistry presentation vce units 1 &2 2015

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