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:
Nov. 22, 2011
Filed:
Oct. 07, 2009
Daniel Fricker, Roeschwoog, FR;
Herbert Gartner, Baden-Baden, DE;
Marc Hager, Haguenau, FR;
Jörg Harren, Krefeld, DE;
Hans-peter Kohler, Bühlertal, DE;
Harald Plöchinger, Bühl, DE;
Daniel Fricker, Roeschwoog, FR;
Herbert Gartner, Baden-Baden, DE;
Marc Hager, Haguenau, FR;
Jörg Harren, Krefeld, DE;
Hans-Peter Kohler, Bühlertal, DE;
Harald Plöchinger, Bühl, DE;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
The present invention relates to a process for the production of a superabsorbent polymer comprising preparing an aqueous mixture of monomers selected to provide after polymerization a superabsorbent polymer; feeding said monomer mixture to a reactor; subjecting the aqueous monomer mixture in the reactor to free-radical polymerization to obtain a superabsorbent polymer gel; removing the superabsorbent polymer gel from the reactor; and drying the superabsorbent polymer gel. Where at least one off-gas stream removed from any stage of the process is subjected to scrubbing with a basic aqueous solution prior to venting to obtain an aqueous scrubber solution that is at least partially recycled to any of the above steps of the process.