Process for preparing carboxylic acid anhydrides

Details Process for preparing carboxylic acid anhydrides Process for preparing carboxylic acid anhydrides

1979-10-02

1981-02-17

Mars, Howard T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260549, C07C 5154, C07C 5156

Patent

active

042514584

ABSTRACT:
A carboxylic acid anhydride, such as acetic anhydride, is prepared from a carboxylate ester or a hydrocarbyl ether in carbonylation processes comprising the use of a halide, carbon monoxide and a Group VIII noble metal in the presence of promoters comprising at least one metal of Group VIB of the Periodic Table, or their compounds, and an arsine of the formula ##STR1## wherein R and R.sup.1 are monocyclic aryl groups or alkyl groups and R.sup.2 is the radical ##STR2## a monocyclic aryl group or an alkyl group, and wherein R.sup.3 and R.sup.4 are each a monocyclic aryl group or an alkyl group, with the proviso that at least one of R, R.sup.1 and R.sup.2 is a monocyclic aryl group, n being zero or a digit from 1-20.

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patent: 4115444 (1978-09-01), Rizkalla

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