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.

公开(公告)号：US20230149871A1

公开(公告)日：2023-05-18

申请号：US17920785

申请日：2021-04-22

Applicant: BASF SE

Inventor： Sebastian Marius Raupp ,  Sylvia Bertha ,  Andreas Daiss ,  Marco Krueger

IPC: B01J2/04 ,  C08F6/10

CPC classification number: B01J2/04 ,  C08F6/10

Abstract: The invention relates to an apparatus for producing a pulverulent product, comprising a device for dropletization (5) of a liquid phase, an addition point (15) for a gas above the device for dropletization (5), at least one gas withdrawal point (19) on the circumference of the apparatus (1), a solid withdrawal point (12) and a tower shell (13) between the device for dropletization (5) and the gas withdrawal point (19) and having, above the solid withdrawal point (12), a region (11) having at least partly a decreasing hydraulic diameter toward the solid withdrawal point (12) and having a maximum hydraulic diameter greater than the mean hydraulic diameter of the tower shell (13), and the tower shell (13) projecting into the region (11) having at least partly a decreasing hydraulic diameter such that an annular duct (23) is formed between the part of the tower shell (13) projecting into the region (11) having at least partly a decreasing hydraulic diameter and the upper part (27) of the region having at least partly a decreasing hydraulic diameter, the at least one gas withdrawal point (19) being disposed in the annular duct (23), wherein the part of the tower shell (13) projecting into the region (11) having at least partly a decreasing hydraulic diameter and forming an inner wall of the annular duct (23) is made at least partly of a gas permeable material (29). The invention further relates to a use of the apparatus (1) for producing pulverulent poly(meth)acrylate.