Process for producing carboxylic acid anhydrides
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United States of America Patent
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Jan 17, 2012
Grant Date -
Jun 10, 2010
app pub date -
Feb 12, 2009
filing date -
Dec 4, 2008
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Abstract
A process for producing carboxylic acid anhydrides by the carbonylation reaction of a carboxylic acid ester, derived from an alcohol and a carboxylic acid, with carbon monoxide containing a small amount of hydrogen in a liquid reaction medium in the presence of a Group VIII B catalyst to produce a carboxylic acid anhydride. The reaction medium comprises the Group VIII B catalyst, an organic halide, the carboxylic acid ester, an alkali metal salt, the carboxylic acid anhydride, the carboxylic acid, and at least one ionic liquid consisting of a cation and an anion where the cation of the ionic liquid has a nitrogen-containing heterocyclic structure. The ionic liquid has at least one of the following structural forms:The reaction rate of the carbonylation reaction is increased by the use of the specified ionic liquid promoters.
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