Acrylic acid and water-absorbing polymer structures based on renewable raw materials and process for their production by dehydration

US7939597B2 · kind B2 · utility

Assignee

• Evonik Stockhausen GmbH · US

Inventors

• Gunther Bub · Marl, DE
• Jurgen Mosler · Marl, DE
• Franz-Felix Kuppinger · Marl, DE
• Andreas Sabbagh · Dülmen, DE
• Guido Stochniol · Haltern am See, DE
• Jorg Sauer · Rodenbach, DE
• Markus Winterberg · Waltrop, DE
• Udo Knippenberg · Marl, DE
• Günter Latoschinski · Marl, DE
• Franck Furno · Mülheim an der Ruhr, DE
• Thorsten Schwärtzke · Marl, DE
• Jorg Leistner · Rheda-Wiedenbrück, DE

Key dates

• Filing date: Aug 22, 2007
• Grant date: May 10, 2011
• Expiry date: Aug 22, 2027

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/32286
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for production of acrylic acid, comprising the steps of a) dehydration of glycerine to an acrolein-comprising dehydration product; b) gas phase oxidation of the dehydration product to obtain an acrylic acid-comprising monomer gas; c) bringing into contact of the monomer gas with a quench agent to obtain an acrylic acid-comprising quench phase; and d) work-up of the quench phase to obtain an acrylic acid-comprising monomer phase; whereby, during the dehydration a liquid phase a1 and a gas phase a2 is present, whereby in the liquid phase a1 a plurality of gas bubbles is generated, as well as a process for production of polymers by polymerization of acrylic acid, preferably for production of water-absorbing polymers, the water-absorbing polymers obtainable by this process, a composite, a process for production of a composite, the composite obtainable by this process, and further chemical products.