sol wrote:
Seriously joking. I don't believe white vinegar is made from petroleum
(unless it is imported from China, then I'd believe it)(though I guess
just about anything *could* be made into vinegar), so far as I'm aware
it is made from fermented grain, according to a google search the most
common grain used is probably corn.
White vinegar is made from chemically produced acetic acid. There are a
number of methods of producing acetic acid, which include both petroleum
as well as fermented sugar feedstocks. It appears that most
manufacturers use a fermented sugar feedstock. Now if you get apple
cider vinegar, it will be using the bacteria conversion method of sugar,
but white distilled could certainly be using petroleum feedstock.
Here are the methods of manufacture from
http://www.indiainfoline.com/sect/chor/ch05.html
Manufacturing process
Oxidation process (from fermented alcohol)
In this, acetaldehyde derived from fermented alcohol is oxidized to
produce acetic acid and acetic anhydride in 70:30 ratio. The process can
be varied so as to produce 100% acetic acid.
Liquid phase oxidation process
There are two ways of producing acetic acid by this process.
First Methodology
In this process the oxidation of acetaldehyde takes place in a reactor.
The end product contains acetaldehyde and acetic acid.
Pure acetic acid is then recovered whereas unconverted acetaldehyde is
recycled.
Second Methodology
This process involves simultaneous production of acetic acid and acetic
anhydride.
On using copper catalysts, water that is produced hydrolyses acetic
acid. There can be variations regarding the ratio of acetic acid and
acetic anhydride required to be produced.
Methanol carbon monoxide method (petroleum method)
Carbon monoxide is made to react with methanol. This results in the
formation of crude acetic acid. This is purified and dehydrated into
acetic acid.
This process requires heavy capital expenditure and installation of huge
capacities.
All manufacturers use acetaldehyde as major feedstock with the exception
of GNFC, which uses methanol.
Marshall
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