Preparing carboxylic acids

Details Preparing carboxylic acids Preparing carboxylic acids

1993-09-28

1995-08-15

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

554154, C07C 5112

Patent

active

054421071

ABSTRACT:
A process for preparing a carboxylic acid having (n+1) carbon atoms (e.g. acetic acid) from an alcohol having n carbon atoms (e.g. methanol) by liquid phase, rhodium catalyses carbonylation is provided. The process is characterized by using a catalyst stabilizer selected from certain classes of imidazolium iodides, alkyl substituted pyridinium iodides and hydroxypyridinium iodides. Most preferred are those derived from the amines 2-ethyl-4-methyl imidazole, 4-ethylpyridine, 4-t-butylpyridine and 3,4-lutidine by quarternisation with a methyl group.

REFERENCES:
patent: 4430273 (1984-02-01), Erpenbach
patent: 4853482 (1989-08-01), Drury et al.
Applied Industrial Catalysis, vol. 1, pp. 275-296 (1983).

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