PURIFICATION OF (METH)ACRYLIC ESTERS BY MEMBRANE SEPARATION DEHYDRATION

摘要

The present invention relates to the production of (meth)acrylic esters, and more particularly the production of C4-C10 alkyl (meth)acrylates comprising the step of membrane separation dehydration of at least one stream generated during the purification of alkyl (meth)acrylate.

主权项

1. A process for producing an alkyl (meth)acrylate comprising a linear or branched alkyl chain comprising from 4 to 10 carbon atoms, by direct esterification of (meth)acrylic acid with a linear or branched alcohol comprising from 4 to 10 carbon atoms in the presence of a catalyst, leading to the formation of a reaction mixture comprising an ester, unreacted acid and alcohol, light by-products and heavy by-products, which mixture is purified by separation to obtain purified alkyl (meth)acrylate, said purification by separation comprising a step of membrane separation dehydration applied to at least one stream selected from the group consisting of: a stream subjected to final distillation leading to recovery of purified (meth)acrylic ester, an aqueous stream originating from settling out of the reaction mixture, and a stream resulting from distillation of the light by-products in the reaction mixture.