IMPROVED METHOD FOR THE PRODUCTION OF UNSATURATED CARBOXYLIC ACID ANHYDRIDES

The invention provides an improved process for preparing unsaturated carboxylic anhydrides of the general formula I R-C(O)-O-C(O)-R  (I) in which R is an unsaturated organic radical having 2 to 12 carbon atoms by transanhydridizing an aliphatic carboxylic anhydride with a carboxylic acid of the gene...

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Bibliographic Details
Main Author BROELL, DIRK
Format Patent
LanguageEnglish
French
German
Published 07.07.2010
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention provides an improved process for preparing unsaturated carboxylic anhydrides of the general formula I R-C(O)-O-C(O)-R  (I) in which R is an unsaturated organic radical having 2 to 12 carbon atoms by transanhydridizing an aliphatic carboxylic anhydride with a carboxylic acid of the general formula II R-COOH  (II) in which R is as defined above, in an apparatus consisting of a reaction region and a rectification column, characterized in that a) the reactants are fed into a reaction region in stoichiometric ratios, b) the carboxylic acid formed as a by-product is removed from the reaction mixture, c) the carboxylic anhydride of the formula I is subsequently drawn off, d) the unconverted reactants are recycled into the reaction region, e) the reaction region comprises a heterogeneous catalyst and f) one or more polymerization inhibitors are added.
Bibliography:Application Number: EP20070803144