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:
Mar. 13, 2018
Filed:
Jan. 14, 2015
Basf SE, Ludwigshafen, DE;
Stephan Bauer, Hochheim, DE;
Norbert Herfert, Altenstadt, DE;
Jürgen Freiberg, Lampertheim, DE;
Rudolf Schliwa, Alzenau, DE;
Karl J. Possemiers, Speyer, DE;
Robert Bayer, Sinsheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase in a reactor comprising a gas distributor (), a reaction zone () and a fluidized bed (), the gas leaving the reactor is treated in a condenser column () with an aqueous solution, the treated gas leaving the condenser column () is recycled at least partly to the fluidized bed (), wherein the gas leaving the condenser column () comprises from 0.05 to 0.3 kg steam per kg dry gas and the steam content of the gas entering the gas distributor () is less than 80% of the steam content of the gas leaving the condenser column ().