Patent ID: 8580012
Filing Date: 2013-11-12
Classification: B01D,C08G,D01F

Abstract:
1. 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 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