Process for producing superabsorbents
AssigneeBASF SE
InventorsMonte Alan Peterson, Ronny De Kaey, Karl Possemiers, Juergen Schroeder, Ruediger Funk, Matthias Weismantel
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Abstract
The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, wherein the monomer solution comprises partly neutralized acrylic acid formed by continuous mixing of acrylic acid and an aqueous solution of a base, the apparatus for preparing the partly neutralized acrylic acid comprises a vessel (B), and the feed line to vessel (B) ends inside vessel (B) below the liquid Level of the partly neutralized acrylic acid.
Claims14
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.
Dependencies are inferred from the claim text.