Process for production of acrylic acid

US9776940B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Tobias Johannes Korn · Ludwigshafen, DE
• Till Blum · Kuantan, MY
• Travis Carline · Lake Jackson, US
• Christopher Fuchs · Angleton, US
• Darryl Welch · Lake Jackson, US
• Peter Zurowski · Landau, DE
• Volker Schliephake · Schifferstadt, DE
• Steffen Rissel · Tauberbischofsheim, DE
• Thorsten Friese · Mannheim, DE
• Ulrich Jaeger · Münstermaifeld, DE
• Sylke Haremza · Neckargemünd, DE

Key dates

• Filing date: Aug 3, 2016
• Grant date: Oct 3, 2017
• Expiry date: Aug 3, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C57/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for production of acrylic acid includes preparing a product gas mixture by a catalytic gas-phase oxidation of a C3 precursor; cooling and contacting the cooled product gas mixture in an absorption column having at least two cooling loops in countercurrent with an absorbent to obtain an absorbate A, containing the absorbent and absorbed acrylic acid; condensing a high boiler fraction of the product gas mixture in a first cooling loop; condensing a low boiler fraction of the product gas mixture in a second cooling loop; maintaining a temperature of the absorbate A in the second cooling loop at a value of at least 56° C.; removing an acid water stream comprising glyoxal from the absorption column at a side take-off located above the second cooling loop; and removing a stream F of absorbate A from the absorption column at a side take-off, located at a height of the absorption column between the first cooling loop and the second cooling loop.