Preparation of acrylic acid

US6939991B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Joachim Thiel · Neustadt, DE
• Ulrich Hammon · Mannheim, DE
• Dieter Baumann · Greven, DE
• Jorg Heilek · Bammental, DE
• Jürgen Schröder · Ludwigshafen, DE
• Klaus Joachim Müller-Engel · Blankenloch, DE

Key dates

• Filing date: Jun 20, 2003
• Grant date: Sep 6, 2005
• Expiry date: Jul 31, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/44
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a C3 precursor of acrylic acid, after direct cooling with a quench liquid, is fractionally condensed in a separating column provided with internals, rising into itself with sidestream takeoff of crude acrylic acid, and the acrylic acid oligomers which form are dissociated and the resulting dissociation gas is subjected to a countercurrent rectification before it is recycled.