Patent ID: 9051067
Filing Date: 2015-06-09
Classification: B01J,B29B,B65B,C08F,C08J

Abstract:
1. A method for producing a particulate water-absorbing agent comprising: a polymerization step for obtaining a polymer gel; a drying step for drying said polymer gel to obtain a particulate water-absorbing resin; a classification step for sieving said particulate water-absorbing resin; a surface cross-linking step for cross-linking the neighborhood of the surface of the particulate water-absorbing resin obtained in the classification step to obtain a particulate water-absorbing agent; a packaging step for filling a packaging material container with said particulate water-absorbing agent for packaging; and a transportation step for transporting the products produced in each of the steps to the other steps; wherein fine powders contained in gas composed principally of air, in any of the steps, are collected by use of a trapping material heated to a temperature at or higher than 60° C.; said trapping material, having a trapping efficiency equal to or higher than 90% for trapping Japanese Industry Standard (JIS) 12-type carbon black with a particle diameter of 0.03 μm to 0.2 μm and being a membrane filter composed of a membrane that captures the fine powders generated from any of the steps at the surface thereof and a substrate that supports the membrane, is provided in a fine powder capturing apparatus in at least one of the steps; and the fine powder capturing apparatus is only connected via a pipeline to, but is not placed within, any of the apparatuses for performing any of the steps.