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:
Dec. 27, 2022
Filed:
Oct. 09, 2018
Basf SE, Ludwigshafen, DE;
Oskar Stephan, Ludwigshafen, DE;
Gerald Gruenewald, Ludwigshafen, DE;
Matthias Weismantel, Ludwigshafen, DE;
Karl Possemiers, Antwerp, BE;
Monte Alan Peterson, Freeport, TX (US);
Ruediger Funk, Ludwigshafen, DE;
Sylvia Bertha, Frankenthal, DE;
Tom Catternan, Geismar, LA (US);
BASF SE, Ludwigshafen, DE;
Abstract
A process for producing superabsorbents, comprising the steps of i) classifying the superabsorbent particles by means of one or more sieves and ii) removing metallic impurities by means of one or more magnetic separators, wherein classification is accomplished using sieves made of a wire mesh, the wires of the wire mesh consist of a steel composed of at least 70% by weight of iron, at least 10% by weight of chromium and less than 2.5% by weight of nickel, and the throughput of superabsorbent particles in the magnetic separator is in the range from 2.0 to 6.5 g/s per cmof free cross-sectional area.