C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 55/14 (2006.01) C07C 51/353 (2006.01)
Patent
CA 2156418
A method for isomerising carboxylic acids and particularly branched acids into the corresponding straight acids. In particular, the method is for isomerising at least one branched saturated carboxylic acid by heating it in the presence of an effective amount of an iridium catalyst and an iodinated or brominated promoter, the promoter:Ir molar ratio being from 0.1:1 to 20:1. The method is particularly suitable for upgrading methyl-glutaric and ethyl-succinic acids into adipic acid.
La présente invention concerne un procédé d'isomérisation d'acides carboxyliques, plus précisément d'acides ramifiés en acides linéaires correspondants. Plus spécifiquement, elle consiste en un procédé d'isomérisation d'au moins un acide carboxylique saturé ramifié, par chauffage, caractérisé en ce que l'on opère en présence d'une quantité efficace d'un catalyseur à l'iridium et d'un promoteur iodé ou bromé, le rapport molaire promoteur/lr étant compris entre 0,1/l et 20/l. Ce procédé permet notamment de valoriser en acide adipique les acides méthyl-glutarique et éthyl-succinique.
Denis Philippe
Patois Carl
Perron Robert
Rhone-Poulenc Chimie
Robic
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