Patent ID: 9126148
Filing Date: 2015-09-08
Classification: B01D,C02F,C12H

Abstract:
1. A process for producing a clarified liquid, comprising a filtration step in which a suspended solid-containing liquid is filtered with a porous membrane whose membrane wall is constructed of a hydrophobic polymer and a hydrophilic polymer, wherein when the membrane wall is divided into 3 sections in the film thickness direction to form region “a” containing one wall surface A of the membrane wall, region “c” containing the other wall surface C and region “b” between region “a” and region “c,” the hydrophilic polymer content ratio C a in region “a” is greater than the hydrophilic polymer content ratio C c in region “c,” and the mean pore size of the wall surface C is larger than the mean pore size of the wall surface A, wherein the filtration is internal pressure filtration.