Method for preparing carboxylic acids by palladium carbonylation
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United States of America Patent
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Sep 20, 2005
Grant Date -
Apr 8, 2004
app pub date -
Dec 21, 2001
filing date -
Dec 27, 2000
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for the preparation of β- or γ-unsaturated or saturated carboxylic acids. It relates more particularly to the hydroxycarbonylation of an organic compound comprising a conjugated unsaturation, such as butadiene, by the action of carbon monoxide and water in the presence of a palladium-based catalyst. The carboxylic acids thus obtained are preferably pentenoic acids. According to the invention, the reaction medium after the end of the hydroxycarbonylation stage is treated with hydrogen to reduce the palladium present in the 2+ oxidation state to palladium in the zero oxidation state and the precipitated palladium is recovered.
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