The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2012
Filed:
Aug. 22, 2007
Franz-felix Kuppinger, Marl, DE;
Axel Hengstermann, Senden, DE;
Guido Stochniol, Haltern am See, DE;
Günther Bub, Marl, DE;
Jürgen Mosler, Marl, DE;
Andreas Sabbagh, Bensheim, DE;
Franz-Felix Kuppinger, Marl, DE;
Axel Hengstermann, Senden, DE;
Guido Stochniol, Haltern am See, DE;
Günther Bub, Marl, DE;
Jürgen Mosler, Marl, DE;
Andreas Sabbagh, Bensheim, DE;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
The invention relates to a process for the preparation of acrylic acid and a process for the preparation of polyacrylic acid comprising the process steps: (a1) preparation of 3-hydroxypropionic acid from a biological material to give a fluid, in particular aqueous, phase containing 3-hydroxypropionic acid; (a2) dehydration of the 3-hydroxypropionic acid to give a fluid, in particular aqueous, solution containing acrylic acid; (a3) purification of the solution containing acrylic acid by a suspension crystallization or a layer crystallization to give a purified phase; and corresponding devices for carrying out these processes, and acrylic acid and polyacrylates. The invention is distinguished in that acrylic acid and polyacrylates can thereby be prepared efficiently, inexpensively, and sustainably with simple means and with a high purity on the basis of regenerable raw materials.