Process for the preparation of monocarboxylic anhydrides

Details Process for the preparation of monocarboxylic anhydrides Process for the preparation of monocarboxylic anhydrides

C - Chemistry, Metallurgy

07

C

260/536.3

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

Patent

CA 1307294

HOE 88/H 009 Process for the preparation of monocarboxylic anhydrides Abstract The process for the preparation of monocarboxylic anhydrides of the general formula (RCO)2O is carried out by react- ing a carboxylic ester or a dialkyl ether of the general formula RCOOR or ROR, in which R in each case denotes the same alkyl radical having 1 to 4 carbon atoms, with carbon monoxide in the gas phase in the presence of a supported catalyst. The reaction takes place by means of bromine or iodine or compounds thereof as reaction promoter. The support material in the catalyst supports a noble metal chelate compound which is formed by a noble metal compound from group VIII of the periodic table and a chelating agent containing organonitrogen, organophosphorus, organoarsenic, organosulfur or mercapto groups and substituted in its basic structure with alkyl, aryl or aralkyl groups. The reaction is carried out at tempera- tures from 130 to 400°C and pressures from 1 to 150 bar.

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