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US 9,751,958 B2Granted
Use of heating steam condensate for producing water-absorbent polymer particles
AssigneeBASF SE
InventorsRüdiger Funk, Jürgen Schröder
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Abstract
The present invention relates to a process for producing water-absorbing polymer particles, wherein an aqueous monomer solution is polymerized and the monomer solution is prepared using steam condensate.
Claims9
A process for producing water-absorbing polymer particles, comprising preparing an aqueous monomer solution or suspension by mixing
- a) at least one ethylenically unsaturated monomer bearing an acid group,
- b) optionally a neutralizing agent,
- c) water at least partly as a steam condensate and the steam condensate comprises less than 1 ppm of dissolved oxygen, and
- d) at least one crosslinker,
- then inertizing the monomer solution or suspension, polymerizing the inertized monomer solution or suspension, then drying the resulting polymer gel, grinding, and classifying,
- wherein the steam condensate is obtained from the condensation of steam in heat exchangers used for drying air in forced air belt dryers in the drying step.
3 more elements
Dependencies are inferred from the claim text.