Process for producing carboxylic acid anhydrides

Details Process for producing carboxylic acid anhydrides Process for producing carboxylic acid anhydrides

2008-04-29

2009-06-30

Zucker, Paul A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid anhydrides

Reexamination Certificate

active

07553991

ABSTRACT:
The present invention relates to a process for producing carboxylic acid anhydrides, in which a carboxylic acid ester, derived from an alcohol and a carboxylic acid, and carbon monoxide containing a small amount of hydrogen are used as raw materials and subjected to a carbonylation reaction 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, at least one organic promoter, the carboxylic acid anhydride and the carboxylic acid, wherein the organic promoter is selected from at least one of the following structural forms (I), (II) and (III). According to the process of the present invention, the reaction rate of the carbonylation reaction is increased by the use of the specified organic promoters.

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