公开(公告)号：US20200283588A1

公开(公告)日：2020-09-10

申请号：US16649793

申请日：2018-10-09

Applicant: BASF SE

Inventor： Oskar Stephan ,  Gerald Gruenewald ,  Matthias Weismantel ,  Karl Possemiers ,  Monte Alan Peterson ,  Ruediger Funk ,  Sylvia Bertha ,  Tom Catternan

IPC: C08J5/02

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 cm2 of free cross-sectional area.

公开(公告)号：US11535719B2

公开(公告)日：2022-12-27

申请号：US16649793

申请日：2018-10-09

Applicant: BASF SE

Inventor： Oskar Stephan ,  Gerald Gruenewald ,  Matthias Weismantel ,  Karl Possemiers ,  Monte Alan Peterson ,  Ruediger Funk ,  Sylvia Bertha ,  Tom Catternan

IPC: C08F20/06 ,  A61L15/60 ,  C08J5/02

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 cm2 of free cross-sectional area.