PROCESS AND APPARATUS FOR RECOVERY OF ACETIC ACID FROM A FEED STREAM CONTAINING THE CORRESPONDING ESTER
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United States of America Patent
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Issued Date -
Jun 9, 2011
app pub date -
Aug 11, 2009
filing date -
Aug 13, 2008
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Abandoned
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Abstract
An apparatus and process for recovery of a carboxylic acid e.g. acetic acid, from an aqueous feed stream containing the corresponding ester, an alcohol and a small amount of water, and in some cases the carboxylic acid includes a catalytic distillation column containing an acidic catalyst and a distillation column. The alcohol is catalytically dehydrated to the corresponding ether and water, and the water reacts with the ester to generate a liquid carboxylic acid rich product stream. The acid is recovered by distillation in the distillation column. In a second embodiment, additional methanol and/or water are co-fed with the feed or fed directly to the catalytic distillation column, resulting in a liquid bottoms product stream of substantially pure acetic acid and a tops distillate stream of substantially pure ether.
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