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:
Jan. 29, 2013
Filed:
Mar. 11, 2009
Axel Hengstermann, Senden, DE;
Franz-felix Kuppinger, Marl, DE;
Jorg Leistner, Rheda-Wiedenbruck, DE;
Jurgen Mosler, Marl, DE;
Peter Jansens, KV Sittard, NL;
Axel Hengstermann, Senden, DE;
Franz-Felix Kuppinger, Marl, DE;
Jorg Leistner, Rheda-Wiedenbruck, DE;
Jurgen Mosler, Marl, DE;
Peter Jansens, KV Sittard, NL;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
The present invention relates to a method for purifying an unpurified phase, containing a target product, preferably (meth)acrylic acid, water, and at least one impurity differing from the target product and from water comprising: a) crystallizing the target product and water; b) separating the crystals from the mother liquor created in step a); c) melting at least part of the separated crystals to form a melt; and d) recycling at least part of said melt to step b). The invention further relates to a method for the production of a purified phase, containing a target product and water, a method for the production of a polymer based on (meth)acrylic acid, polymers that may be obtained by means of said method, chemical products, such as fibers or molded bodies, and the use of polymers.