Process for preparing carboxylic acids

Details Process for preparing carboxylic acids Process for preparing carboxylic acids

1991-09-27

1993-06-08

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562519, 554129, 554132, 554154, C07C 5110, C07C 5112

Patent

active

052181430

ABSTRACT:
An improved liquid-phase process for preparing carboxylic acids having (n+1) carbon atoms by rhodium catalyzed carbonylation of an alcohol having n carbon atoms is provided. The process is particularily suitable for preparing acetic acid from methanol in commercial carbonylation reactors operating at steady-state with a low standing quantity of water (e.g. 0.5 to 5% by weight). The improvement lies in carrying out the carbonylation in the presence of an iodide stabilizer (e.g. lithium iodide) and a Group VI B metal costabiliser. The process can optionally be carried out in the presence of hydrogen.

REFERENCES:
patent: 4733006 (1988-03-01), Singleton et al.
patent: 4894477 (1990-01-01), Scates et al.

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