Patent ID: 8318895
Filing Date: 2012-11-27
Classification: B01J,C08F,C08L

Abstract:
1. A process for recycling superabsorbent polymer fines in the production of superabsorbent polymer gel, compromising the steps of: a) dissolving at least one acrylic acid monomer and/or its sodium salt and a cross-linking agent in an aqueous solution to form a monomer solution; b) polymerizing the mixture obtained in step a) to produce a superabsorbent polymer gel; c) treating the superabsorbent polymer fines with a caustic solution containing from about 0.1 to about 12% caustic based on the weight of the superabsorbent polymer fines to form caustic treated superabsorbent polymer fines; and d) mixing the caustic treated superabsorbent polymer fines obtained in step c) with the superabsorbent polymer gel obtained in step b) to provide an aqueous fluid absorbent polymer, wherein the content of the superabsorbent polymer fines relative to the total amount of the superabsorbent polymer gel is from about 0.1 to about 30 wt %.