C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 67/03 (2006.01) C07C 67/54 (2006.01) C07C 69/54 (2006.01)
Patent
CA 2692615
The present invention relates to a process for preparing (meth)acrylates, which comprises the transesterification of an alcohol with a low-boiling ester of (meth)acrylic acid in the presence of catalysts, with the alcohol liberated from the low-boiling ester of (meth)acrylic acid being separated off by distillation, characterized in that the molar ratio of low-boiling ester of (meth)acrylic acid to starting alcohol present in the reaction mixture is increased during the reaction by addition of low-boiling ester of (meth)acrylic acid. The process of the invention makes a particularly inexpensive preparation of (meth)acrylates having a very high purity possible.
La présente invention concerne un procédé de production de (méth)acrylates, consistant en la transestérification d'un alcool avec un ester de l'acide (méth)acrylique à bas point d'ébullition en présence de catalyseurs, l'alcool libéré issu de l'ester de l'acide (méth)acrylique à bas point d'ébullition étant séparé par distillation. Le procédé se caractérise en que le rapport molaire ester de l'acide (méth)acrylique à bas point d'ébullition/alcool de substitution, dans le mélange réactionnel, est augmenté pendant la réaction par ajout d'esters de l'acide (méth)acrylique à bas point d'ébullition. Le procédé selon l'invention permet de produire des (méth)acrylates de très haute pureté d'une façon particulièrement économique.
Kehr Thomas
Knebel Joachim
Koelbl Gerhard
Lauster Guenter
Protzmann Guido
Evonik Roehm Gmbh
Marks & Clerk
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