Method for producing carboxylic acid anhydride

Details Method for producing carboxylic acid anhydride Method for producing carboxylic acid anhydride

1981-04-02

1982-06-08

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5156, C07C 5154, C07C 5312

Patent

active

043338852

ABSTRACT:
A method is disclosed for the production of carboxylic acid anhydride in high yield by the carbonylation of a liquid reaction mixture comprising a carboxylic acid ester using synthesis gas in the presence of a noble metal catalyst and iodide promoter. The improved process is carried out in the presence of a carboxylic acid inhibitor, preferably having an acyl group corresponding to the acyl moiety of the carboxylic acid ester, in a side-reaction-inhibiting amount to the liquid reaction mixture. The formation of undesirable by-products, particularly methane, is reduced and a hydrogen enriched gas is produced.

REFERENCES:
patent: 2730546 (1956-01-01), Reppe et al.
patent: 4046807 (1977-09-01), Kuckertz
patent: 4234719 (1980-11-01), Wan

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