Process for making monocarboxylic anhydrides

Details Process for making monocarboxylic anhydrides Process for making monocarboxylic anhydrides

C - Chemistry, Metallurgy

07

C

260/536.3

C07C 51/54 (2006.01) B01J 31/16 (2006.01) C07C 51/56 (2006.01) C07C 53/12 (2006.01)

Patent

CA 1264164

PROCESS FOR MAKING MONOCARBOXYLIC ANHYDRIDES ABSTRACT OF THE DISCLOSURE Monocarboxylic anhydrides of the general formula (RCO)2O are made by reacting a carboxylic acid ester or dialkylether of the general formulae RCOOR and ROR, respectively, in which R each stands for one and the same alkyl group having from 1 to 4 carbon atoms, with carbon monoxide in gas phase in the presence of iodine or bromine or their compounds as a reac- tion promoter and also in the presence of a carrier-supported catalyst containing a compound of a noble metal belonging to group VIII of the Periodic System, at temperatures of from 130 to 400°C and under pressures of from 1 to 150 bars. More particularly, a carrier-supported catalyst is used which has an organosilicon compound containing an alkoxy or halogen group and also an organonitrogen, organophosphorus, organo- arsenic, organosulfur, mercapto or thioether group as a poly- functional adhesion promoter additively combined with the carrier material on the one hand, and with the noble metal compound on the other hand.

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