Process for the production of carboxylic acid anhydrides

Details Process for the production of carboxylic acid anhydrides Process for the production of carboxylic acid anhydrides

C - Chemistry, Metallurgy

07

C

C07C 53/12 (2006.01) C07C 51/56 (2006.01)

Patent

CA 2115530

ABSTRACT PROCESS FOR THE PRODUCTION OF CARBOXYLIC ACID ANHYDRIDES A process for the production of a carboxylic acid anhydride comprises contacting a reaction composition comprising a carboxylic acid ester, a hydrocarbyl halide and/or a hydrocarbyl ether reactant and a hydrocarbyl halide promoter with carbon monoxide in the presence of a catalyst comprising an insoluble polymer support having pendant quaternised N-base or alkylated N-oxide pyridine groups supporting a rhodium species in which process the rhodium species is prevented from leaching from the polymer support by maintaining throughout the process a finite concentration of carboxylic acid anhydride in the reaction composition.

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