Carrier-supported catalyst and process for making mono-carboxylic anhydrides

US4776987A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gerhard Luft · Mühltal, DE
• Gebhard Ritter · Ingelheim am Rhein, DE

Key dates

• Filing date: Mar 14, 1986
• Grant date: Oct 11, 1988
• Expiry date: Mar 14, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2531/80
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Monocarboxylic anhydrides of the general formula (RCO).sub.2 O are made by reacting a carboxylic acid ester or dialkylether of the general formulae RCOOR and ROR, 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.degree.-400.degree. C. and under pressures of 1-150 bars. To this end, a novel carrier-supported 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.