CARRIER-SUPPORTED CATALYST AND PROCESS FOR MAKING MONOCARBOXYLIC ANHYDRIDES

摘要

CARRIER-SUPPORTED CATALYST AND PROCESS FOR MAKING MONO CARBOXYLIC ANHYDRIDES Monocarboxylic anhydrides of the general formula (RCO)2O are made by reacting a carboxylic acid ester or dialkylether of the general formulae RCOOR and ROH, respectively, in which R stands for one and the same alkyl radical having from 1 4 carbon atoms, with carbon monoxide in gas phase, in the presence of iodine or bromine or their compounds as a reaction promoter and also in the presence of a carrier-supported catalyst containing noble metal compounds of group VIII of the Periodic System, at temperatures of 130 - 400.degree.C and under pressures of 1 - 150 bars. To this end, a novel carrier-sup-ported catalyst is used in which the carrier material has a noble metal/chelate-compound formed of the noble metal compound and a chelator containing organonitrogen, organophosphorus, organoarsenic or organosulfur groups applied to it.