Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid anhydrides
Patent
1988-03-31
1990-03-06
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid anhydrides
502155, 502152, 502162, C07C 5154
Patent
active
049064150
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.
REFERENCES:
patent: 4046807 (1977-09-01), Kreckertz
patent: 4115444 (1978-09-01), Rizballa
patent: 4284585 (1981-08-01), Pugach
patent: 4284586 (1979-12-01), Pugach et al.
patent: 4559183 (1985-12-01), Hewlett
Luft Gerhard
Ritter Gebhard
Hoechst Aktiengesellschaft
Killos Paul J.
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