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claude
(Stranger) 09-01-04 09:02 No 528873 |
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GAA from > 75% acetic acid solutions | ||||||
GAA is not equally easy to find OTC in all countries. In some places, only the 75% or maybe 80% are available. So, I've read numerous post concerning the drying of aqueous solutions of acetic acid, particularely for concentration superior to 75%. And the use of a drying agent like MgSO4, or CuSO4 is rarely mentionned. But CuSO4 is said to work for formic acid, when concentration superior to 77% (which is the azeotrope water/formic acid) is needed. So, maybe it can work for acetic acid too ? But, that's right, a big quantity of drying agent is needed : For exemple for 1L of 75% solution of acetic acid : the quantity of water is approximately 250g i.e. 250/18 = 13,9 mol. Each mole of CuSO4 crystallize with 5 moles of H2O. So, too absorb all the water, we need a minimum of 13,9/5 = 2,78 mol of CuSO4 i.e. 2,78 X 159,6 = 443,7 g of CuSO4. It's big, but it's possible, what's your opinion ? Informations that prove that doesn't work ? |
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Nicodem (Hive Bee) 09-02-04 01:55 No 529089 |
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You can azeotropicaly dry acetic acid | ||||||
You can azeotropicaly dry acetic acid: http://separationprocesses.com/Distillat You can make some n-butyl acetate from your 75% acetic acid and n-butanol. “The real drug-problem is that we need more and better drugs.” – J. Ott |
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claude (Stranger) 09-02-04 04:01 No 529115 |
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Thanks Nicodem | ||||||
This process is technically interesting, but unless you have already n-butyl acetate, it involves a new esterification reaction to form it from acetic acid and n-butanol. Followed by the azeotrope drying, including a distillation. So, if the method of drying agents can work, it's a good point. If it's a dead end, then I will look in the azeotrope drying way. |
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