Preparation of (meth)acrylates

US6512138B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Albrecht Dams · Monsheim, DE
• Heinrich Aichinger · Mannheim, DE
• Holger Herbst · Bischofswerda, DE
• Gerhard Nestler · Ludwigshafen, DE
• Jürgen Schröder · Ludwigshafen, DE

Key dates

• Filing date: May 10, 2000
• Grant date: Jan 28, 2003
• Expiry date: May 10, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/327
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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 s…