Patent ID: 9308478
Filing Date: 2016-04-12
CPC Classification: B01D

Claim Text:
1. A method for hydrophilizing a hollow fiber membrane module, the method comprising hydrophilizing an external-pressure type hollow fiber membrane module which comprises a plurality of hollow fiber membranes and a casing having an upper nozzle and a lower nozzle respectively in upper and lower ends thereof and in which the hollow fiber membranes are bonded and fixed in an upper part of the casing with hollow portions of the hollow fiber membranes being open to form an upper bonded/fixed layer and are bonded and fixed to an inside of the casing in a lower part of the casing with the hollow portions being sealed to form a lower bonded/fixed layer, by introducing an alcohol-containing liquid from the upper nozzle, causing the alcohol-containing liquid to permeate the hollow fiber membranes from a hollow portion-side thereof to an outside thereof, and discharging the alcohol-containing liquid from the lower nozzle, wherein a permeation rate of the alcohol-containing liquid is controlled so that an air layer is formed in a space between the casing and the outside of the hollow fiber membranes.