US 12,220,686 B2
Process for producing superabsorbents
Monte Alan Peterson, Freeport, TX (US); Ronny De Kaey, Antwerp (BE); Karl Possemiers, Antwerp (BE); Juergen Schroeder, Ludwigshafen (DE); Ruediger Funk, Ludwigshafen (DE); and Matthias Weismantel, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen (DE)
Appl. No. 17/289,287
Filed by BASF SE, Ludwigshafen (DE)
PCT Filed Nov. 4, 2019, PCT No. PCT/EP2019/080015
§ 371(c)(1), (2) Date Apr. 28, 2021,
PCT Pub. No. WO2020/099155, PCT Pub. Date May 22, 2020.
Claims priority of application No. 18206128 (EP), filed on Nov. 14, 2018.
Prior Publication US 2021/0402370 A1, Dec. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 120/06 (2006.01); B01J 19/00 (2006.01); B01J 19/24 (2006.01); B01J 20/26 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 19/0053 (2013.01); B01J 19/2465 (2013.01); B01J 20/28047 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01); C08F 120/06 (2013.01); B01J 2219/00166 (2013.01); B01J 2219/1943 (2013.01); B01J 2219/1945 (2013.01); C08F 2810/20 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A process for producing superabsorbent polymer particles, comprising polymerizing of a monomer solution, comprising
a) partly neutralized acrylic acid,
b) at least one crosslinker, and
c) at least one initiator,
drying a resulting polymer gel, optionally grinding and classifying a resulting dried polymer gel and optionally thermally post-crosslinking and cooling resulting polymer particles, wherein the partly neutralized acrylic acid is formed by continuous mixing of acrylic acid, an aqueous solution of a base, and optionally water, an apparatus for preparing the partly neutralized acrylic acid comprises a ring line (R), a vessel (B), a heat exchanger (W), and a pump (P), and a feed line to vessel (B) ends inside vessel (B) below a liquid level of the partly neutralized acrylic acid.