Continuous recovery of (meth)acrylic acid

US6350906B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Otto Machhammer · Mannheim, DE
• Peter Zehner · Ludwigshafen, DE
• Filip Deberdt · Bonheiden, BE

Key dates

• Filing date: Jul 29, 1999
• Grant date: Feb 26, 2002
• Expiry date: Sep 24, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the continuous recovery of (meth)acrylic acid from the reaction gases of a catalytic gas-phase oxidation by (I) absorption in a high-boiling solvent, (II) isolation of the (meth)acrylic acid from the mixture with the solvent and, if required, further purification of the (meth)acrylic acid isolated, (III) purification of the solvent and (IV) recycling of the purified solvent to absorption stage (I) is proposed, the temperature in each process stage not exceeding 155° C., in particular 140° C., preferably 120° C.