Patent Number: 6,512,138

Title: Preparation of (meth)acrylates

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.

Inventors: Dams; Albrecht (Wachenheim, DE), Aichinger; Heinrich (Mannheim, DE), Herbst; Holger (Frankenthal, DE), Nestler; Gerhard (Ludwigshafen, DE), Schroder; Jurgen (Ludwigshafen, DE)

Assignee: BASF Aktiengesellschaft

International Classification: C07C 67/00 (20060101); C07C 67/08 (20060101); C07C 67/327 (20060101); C07C 069/52 (); C07C 067/30 (); C07C 067/03 ()

Expiration Date: 01/28/2020