公开(公告)号：US20250041828A1

公开(公告)日：2025-02-06

申请号：US18694478

申请日：2022-09-16

Applicant: BASF SE

Inventor： Thomas Daniel ,  Sebastian Marius Raupp ,  Monte Alan Peterson ,  Vernon Lynn Adey ,  Karl Possemiers

IPC: B01J20/26 ,  B01J20/28 ,  B01J20/30

Abstract: A process for producing surface postcrosslinked superabsorbent particles, wherein an aqueous monomer solution with a small amount of initiator is polymerized to give a polymer gel, the resultant polymer gel is extruded through a die plate, the extruded polymer gel is dried on an air circulation belt drier having one or more zones, and the resultant polymer particles are ground and classified and then thermally surface postcrosslinked, wherein the temperatures of the drying gas supplied in the course of drying in the forward zones of the air circulation belt drier are from 120 to 160° C., and the speeds of the air supplied are from 1.2 to 3.0 m/s.