Production process for producing water-absorbent polymer particles and belt dryer

• Main Authors: FUNK RUDIGER, GRUNEWALD GERALD, WEISMANTEL MATTHIAS
• Format: Patent
• Language: Chinese; English
• Published: 23.03.2018
• Subjects: BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; DRYING; DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM; HEATING; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WEAPONS

Production process for producing water-absorbent polymer particles, wherein the production process comprises the following steps: - polymerizing (S1) an aqueous monomer solution or suspension to produce an aqueous polymer gel (S2), - drying (S3) the aqueous polymer gel in a belt dryer with a conveyor belt (400), involving receiving the aqueous polymer gel on the conveyor belt (400) and conveying the polymer gel on the conveyor belt (400) in a conveying direction (C) of the conveyor belt (400), - crushing and/or grinding (S4) the dried polymer gel into water-absorbent polymer particles, wherein, for the drying (S3): - the belt dryer has a dryer structure (101), in the internal space (101i) of which the conveyor belt (400) is run. According to the invention, it is provided that - drying airis circulated in the internal space (101i) of the dryer structure (101) in counterflow (C') to the conveying direction (C) and the internal space of the dryer structure (101) is kept largely, preferably completely, at a negat