Process for separating acrylic acid present as a main constituent and glyoxal present as a by-product in a product gas mixture of a partial heterogeneously catalyzed gas phase oxidation of a C3 precursor compound of acrylic acid

US8299299B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Till Blum · Kuantan, MY
• Peter Zurowski · Landau, DE
• Steffen Rissel · Tauberbischofsheim, DE
• Sylke Haremza · Neckargemünd, DE
• Thorsten Friese · Mannheim, DE
• Ulrich Jaeger · Münstermaifeld, DE
• Volker Schliephake · Schifferstadt, DE
• Klaus Joachim Mueller-Engel · Blankenloch, DE
• Ulrich Hammon · Mannheim, DE
• Joerg Heilek · Bammental, DE
• Imke Britta Mueller · Heidelberg, DE

Key dates

• Filing date: Jul 24, 2009
• Grant date: Oct 30, 2012
• Expiry date: Feb 9, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/43
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for separating acrylic acid present as a main product and glyoxal present as a by-product in a product gas mixture of a partial gas phase oxidation of a C3 precursor compound, in which a liquid phase P is obtained, which consists of acrylic acid to an extent of at least 70% of its weight and, based on the molar amount of acrylic acid present therein, comprises at least 200 molar ppm of glyoxal, in which the glyoxal is separated from the acrylic acid in the liquid phase P by crystallization.