pbmineral - 5-7-2007 at 02:03
Hi, I've just bought some acetic acid from drugstore
The concentration is around 75%
I'd like to get glacial acetic acid (so purify it).
What can I do ?
-cristalization
- distillation (I have pure H2SO4)
Waiting for your answers
Thanks
Peter
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unionised - 5-7-2007 at 09:59
I have a feeling this has been discussed before. Did you search first?
garage chemist - 5-7-2007 at 10:28
No, the discussion has always revolved about concentrating vinegar. Here the subject is getting from 75% to 100%, so I think this thread can continue.
Azeotropic removal of the water using a third component like benzene, toluene or ethyl acetate which forms a lower- boiling azeotrope with water is
used in industry. Add a good amount of ethyl acetate to your acetic acid, and distill over a column. First fraction is ethyl acetate-water azeotrope,
second one is excess ethyl acetate (if you used enogh of it) and third one is acetic acid of at least 99% purity.
Freezing is a method to get the last bit of water out, e.g. to get from above 95% to nearly 100%. Acetic acid and water form an eutectic which freezes
below -16°C, so only if the initial concentration of the acid is above this can freezing have any effect.
I dont know the composition of this eutectic though.
bio2 - 5-7-2007 at 15:35
Check one of my old posts on using the urea adduct of >60%
Acetic Acid to get the Glacial.
chemkid - 6-7-2007 at 16:49
What country do you live in? What drug stores do you go to? I've never heard of 75% Acetic acid in drug stores?! Please inform me!
ldm2319 - 25-7-2007 at 08:06
good method !
chemrox - 25-7-2007 at 14:10
I belive the library has a copy. This is from, Perrin, DD & WLF Armarego, Purification of Laboratory Chemicals, 3rd Ed., Butterworth Heinmann,
Oxford etc.
[Edited on 25-7-2007 by chemrox]
pbmineral - 25-7-2007 at 14:16
Hi everybody,
Please excuse me I was too busy to answer your questions and thank you for all your posts.
I live in France in "Rhône Alpes" Here many chemicals are availlable.
All VWR for instance except éthanol or ether
and suppliers for swimming pools just an example :
http://www.dousselin.fr/
all chemicals are availlable and cheap !
Thnak you for the images and scans !
Peter