Method for preparing an aqueous acrylamide solution having a low acrylic acid concentration

US10227621B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Michael Braun · Heidelberg, DE
• Juergen Daeuwel · Ludwigshafen, DE
• Hans-Juergen Lang · Dudenhofen, DE
• Peter Oedman · Neustadt, DE
• Kai-Uwe Baldenius · Ludwigshafen, DE
• Matthias Kleiner · Mannheim, DE
• Michael C. Kiefer · Clayton, US
• Stephan Freyer · Neustadt, DE
• Michael Budde · Ilvesheim, DE

Key dates

• Filing date: Sep 30, 2015
• Grant date: Mar 12, 2019
• Expiry date: Sep 30, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2201/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to methods for preparing an aqueous acrylamide solution having a low acrylic acid concentration. In addition, the present invention relates to methods for reducing the acrylic acid concentration of an aqueous acrylamide solution. The methods involve a bioconversion of acrylonitrile to acrylamide in the presence of a biocatalyst, wherein during the bioconversion the content of acrylonitrile is maintained at 0.3 w/w % or more referred to the total weight of the composition in the reactor. Also provided is an aqueous acrylamide solution which is obtained by the methods of the present invention. Furthermore, the present invention is related to an acrylamide homopolymer or copolymer obtained by polymerizing the acrylamide of the aqueous solution.