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:
May. 15, 2012
Filed:
Aug. 11, 2006
Torsten Balduf, Pfungstadt, DE;
Günther Bub, Marl, DE;
Jürgen Mosler, Castrop-Rauxel, DE;
Andreas Sabbagh, Dülmen, DE;
Jürgen Kohn, Rheinberg, DE;
Arndt Selbach, Dirmstein, DE;
Torsten Balduf, Pfungstadt, DE;
Günther Bub, Marl, DE;
Jürgen Mosler, Castrop-Rauxel, DE;
Andreas Sabbagh, Dülmen, DE;
Jürgen Kohn, Rheinberg, DE;
Arndt Selbach, Dirmstein, DE;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
A process for production of (meth)acrylic acid is disclosed. The process includes synthesizing and distillatively working-up a crude (meth)acrylic acid phase to obtain a (meth)acrylic acid phase and a dimer phase including (meth)acrylic acid dimers and/or (meth)acrylic acid oligomers. At least a part of the (meth)acrylic acid dimers and/or of the (meth)acrylic acid oligomers from the dimer phase is split to obtain a (meth)acrylic acid including a low-boiling phase and a high-boiling phase including less (meth)acrylic acid than the low-boiling phase. At least a part of the (meth)acrylic acid from the low-boiling phase is separated by forming of one or more crystals to obtain a pure (meth)acrylic acid and a residue. Also disclosed is a device for production of (meth)acrylic acid, a process for production of a polymer as well as chemical products based on or including (meth)acrylic acid or a polymer as well as the use of (meth)acrylic acid or polymers in chemical products.