Patent ID: 8580012

Claim:
A method for producing an asymmetric hollow fiber gas separation membrane, comprising: mixing a polyimide component A and a polyimide component B to prepare a multicomponent polyimide mixed solution in a combination such that N A and N B satisfy equation 1: 2.35 ×N A −2.09 <N B <450 ×N A −1.12 (equation 1); further subjecting said multicomponent polyimide mixed solution to a polymerization-imidization reaction; forming an asymmetric hollow fiber polyimide membrane by a phase inversion process using said multicomponent polyimide mixed solution; and then, subjecting said asymmetric hollow fiber polyimide membrane to a heat treatment having a maximum temperature in a range from 350 to 450° C., wherein the polyimide component A is a starting material component of a polyimide A comprising a fluorine atom in its chemical structure and/or a polymerization-imidization reaction product of said starting material component, N A is a number averaged degree of polymerization of said polyimide component A, the polyimide component B is a starting material component of a polyimide B and/or a polymerization-imidization reaction product of said starting material component, and N B is a number averaged degree of polymerization of said polyimide component B.