chucknorris
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Vinegar purification
I vaporized some vinegar and found out it contains 0.5-2% of impurities that will leave brown-blackish residue when distilled dry.
I just though that what kind of impurities those could be, and would there be any easy ways to get rid of them? Boiling isn't, since vinegar
concentration is so low I'd need to distill whole container of that stuff.
And, would these impurities cause trouble in some processes other than decreasing the possible yield by a percent or two, since this definintely
doesn't matter.
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hissingnoise
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Glacial AA is easily bought almost anywhere!
And I know that some vinegars contain caramel in solution but that may be the amber variety ─ most vinegars would have flavorings or spices of
various sorts!
Google it?
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Nicodem
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Thread Moved
27-1-2013 at 07:33 |
K12Chemistry
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It is really dependant upon the type of vinegar. I'm guessing it is malt vinegar, if it is then the residue is barley malt. I wouldn't use it as a
source of acetic acid because it is really weak and impure. At the supermarket you can get malt vinegar for 45p (500ml) or distilled vinegar for 30p
(500ml).
Distilled vinegar is a great source for acetic acid and you can fractional crystallize it to get stronger concentrations.
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Pyro
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mix with NaHCO3 untill no more CO2 forms. then distill with conc. H2SO4
all above information is intellectual property of Pyro.  |
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vmelkon
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Your local supermarket sells it?
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wireshark
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Actually I heard some oriental grocery stores carry glacial acetic. Analog photography is dead, so there went that source (stop bath). Best thing to
do is to just order GAA and pay the hazmat fee. It'll still be cheaper than buying dozens of gallons of vinegar.
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sbbspartan
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You can get Acetic Anhydride at Elemental Scientific very cheaply, at about $1 an ounce or $15 for 16 ounces. Their glacial acetic acid is also only
about $9 for 16 ounces. There is no hazmat fee for Elemental either... That would probably be easier than trying to purify regular vinegar or making
your own concentrated stuff. You would have to wait a while to receive your order though...
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elementcollector1
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Quote: Originally posted by sbbspartan  | | You can get Acetic Anhydride at Elemental Scientific very cheaply, at about $1 an ounce or $15 for 16 ounces. Their glacial acetic acid is also only
about $9 for 16 ounces. There is no hazmat fee for Elemental either... That would probably be easier than trying to purify regular vinegar or making
your own concentrated stuff. You would have to wait a while to receive your order though... |
To clarify, Elemental-Scientific doesn't have hazmat on this particular chemical. Oh, would that I could order anything I wanted and not pay the extra
$11-25 for various hazmat fees...
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wireshark
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See attachment. It's possible to electrolytically oxidize ethanol to ethanoic acid. There's also the possibility of the thermolysis of acetone to
ethenone, and quenching it produce ethanoic acid.
The ambitious chemist only needs earth, fire, water, and air. 
Attachment: acetic.acid.from.ethanol.pdf (288kB)
This file has been downloaded 1155 times
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Sedit
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Add a fuck load of salt to distilled vinegar then extract 3x with DCM. Combine the DCM extracts and dry with MgSO4. Distill the DCM to recover Glacial
acetic acid. If your starting with 5% AcOH dont expect alot of GAA from the process but its tried and true. IIRC Potassium Sulfate is one of the best
salts to use to force AcOH into the non-polar layer but NaCl is rather cheep so I would go with that.
The stronger the starting concentration the higher the yields.
Electrolysis of EtOH with NaCl and Copper electrodes produced awesome crystals of Copper acetate and some polymer gunk as well. Just a rough and dirty
test.
Knowledge is useless to useless people...
"I see a lot of patterns in our behavior as a nation that parallel a lot of other historical processes. The fall of Rome, the fall of Germany — the
fall of the ruling country, the people who think they can do whatever they want without anybody else's consent. I've seen this story
before."~Maynard James Keenan
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