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:
Jul. 07, 2009
Filed:
Mar. 17, 2003
Stefan Nordhoff, Recklinghausen, DE;
Torsten Balduf, Marl, DE;
Gunther Bub, Marl, DE;
Roland Fornika, Dulmen, DE;
Jurgen Mosler, Castrop-Rauxel, DE;
Thomas Rathke, Mandeville, LA (US);
Axel Kobus, Bochum, DE;
Dennis Thong, Marl, DE;
Stefan Nordhoff, Recklinghausen, DE;
Torsten Balduf, Marl, DE;
Gunther Bub, Marl, DE;
Roland Fornika, Dulmen, DE;
Jurgen Mosler, Castrop-Rauxel, DE;
Thomas Rathke, Mandeville, LA (US);
Axel Kobus, Bochum, DE;
Dennis Thong, Marl, DE;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, wherein, in the purified phase, the quantity of at least one impurity is less than 7% by weight, based on (meth)acrylic acid in the purified phase.