Method for the production of superabsorbents

US12239947B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thomas Pfeiffer · Kumhausen, DE
• Ruediger Funk · Ludwigshafen, DE
• Marco Krueger · Mannheim, DE
• Karl J. Possemiers · Schilde, BE
• Juergen Schroeder · Ludwigshafen, DE
• Matthias Weismantel · Bad Orb, DE

Key dates

• Filing date: Aug 9, 2019
• Grant date: Mar 4, 2025
• Expiry date: May 16, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing superabsorbent particles by polymerizing a monomer solution, comprising the steps of continuously polymerizing the monomer solution on the continuous belt of a belt reactor, comminuting the polymer gel obtained, rinsing the polymer gel obtained on the underside of the belt reactor into a separation unit with water, separating the polymer gel from the water in the separation unit and recycling the polymer gel into the comminution, wherein the polymer gel has a swelling capacity in water of at least 100 g/g, the dwell time of the polymer gel in the rinse water is less than 40 minutes, and the separation unit has openings with a clear width of at least 1 mm.