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663348
CO2 - villain to saviour
Description
Mind Map on CO2 - villain to saviour, created by prisillajohnson9 on 22/03/2014.
Mind Map by
prisillajohnson9
, updated more than 1 year ago
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Created by
prisillajohnson9
about 10 years ago
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Resource summary
CO2 - villain to saviour
as a solvent
used to dissolve chemical reactants
supercritical fluid
when alternating temp and pressure of CO2 which converts it into an unusual state
scCO2
critical temp - 31°C
can be used as a solvent with materials that would usually decompose at high temp
properties can be modified by controlling the pressure
to extract or purify products
in foam
CFCs used as blowing agents
manufacture expanded polystyrene foan for packaging
no longer used
company using CO2 as a blowing agent
CO2 waste from industrial and natural sources
for decaffeinated coffee
scCO2
removes 97-99% of caffeine
the pressure adjusted so that only caffeine is removed
flavouring remains and there is no toxicity
for beer
produces natural fizz in beer
extract the characteristic flavour of beer from hops
for dry cleaning
scCO2
used as a wetting agent
safer solvent
for toxic waste treatment
many organic compounds dissolve in scCO2
remove toxic materials from waste
solvent's properties are adjusted using higher temp and pressure
allows toxins to be removed from toxic waste mixtures
for chemical synthesis
scCO2
ability to control its properties
desired product obtained with fewer co-products
simpler product separation
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