METHOD FOR MANUFACTURING POROUS HOLLOW FIBER SEPARATION MEMBRANE

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a porous hollow fiber separation membrane which is capable of simultaneously satisfying both of high water permeation performance and separation performance of a nano filtration level or both of high gas permeation performance and gas separation performance. SOLUTION: The porous hollow fiber separation membrane is manufactured by extruding a spinning stock solution which is prepared by using polyether imide and polyamide imide at a blending ratio of 2/8 to 9/1 and dissolving these polymers at a concentration of 25 to 35 wt.% into a solidifying bath from double annular nozzles under heating conditions of >=70 deg.C and solidifying the same.