Pentenoic acid hydroxycarbonylation method
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United States of America Patent
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Apr 16, 2002
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N/A
app pub date -
Mar 17, 1999
filing date -
Jun 7, 1996
priority date (Note) -
Expired
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Abstract
The invention discloses pentenoic acid hydroxycarbonylation into adipic acid. More particularly, it concerns one pentenoic acid hydroxycarbonylation method involving reaction water and carbon monoxide, in the presence of a catalyst comprising at least rhodium and/or iridium and an iodinated or brominated catalytic promoter. In the method, the catalyst is derived at least in part from a previous pentenoic acid hydroxycarbonylation operation. The reaction is effected in the presence of an amount of branched carboxylic diacids having 6 carbon atoms not exceeding 200 grams per kilogram reaction mixture.
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