Invention Grant
- Patent Title: Preparation of (meth)acrylates
- Patent Title (中): (甲基)丙烯酸酯的制备
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Application No.: US09567983Application Date: 2000-05-10
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Publication No.: US06512138B1Publication Date: 2003-01-28
- Inventor: Albrecht Dams , Heinrich Aichinger , Holger Herbst , Gerhard Nestler , Jürgen Schröder
- Applicant: Albrecht Dams , Heinrich Aichinger , Holger Herbst , Gerhard Nestler , Jürgen Schröder
- Priority: DE19922722 19990518
- Main IPC: C07C6952
- IPC: C07C6952

Abstract:
The process for the esterification of (meth)acrylic acid with an alkanol in the presence of an esterification catalyst, in which unconverted starting compounds and the (meth)acrylate to be formed are separated off by distillation and an oxyester-containing bottom product is formed and is separated off, and (a) in the bottom product separated off, the oxyesters present are cleaved, if required after the addition of (meth)acrylic acid and/or oligomeric (meth)acrylic acid, directly in the presence of acid catalysts differing from (meth)acrylic acid and/or oligomeric (meth)acrylic acid, and the cleavage products are removed, a cleavage residue remaining, or (b) the oxyesters are first removed by distillation from the cleavage product separated off, a distillation residue remaining, and the oxyesters removed are cleaved, if required after addition of (meth)acrylic acid and/or oligomeric (meth)acrylic acid, in the presence of acid catalysts differing from (meth)acrylic acid and/or oligomeric (meth)acrylic acid, and the cleavage products are removed, a cleavage residue remaining, is carried out in such a way that the cleavage residue obtained in step (a) or the cleavage residue obtained in step (b) is hydrolytically cleaved together with the resulting distillation residue in the presence of water and acids or bases.
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