Method for preparing carboxylic acids by palladium...

Details Method for preparing carboxylic acids by palladium... Method for preparing carboxylic acids by palladium...

2005-09-20

2005-09-20

Richter, Johann (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S522000, C562S546000, C502S034000

Reexamination Certificate

active

06946574

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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