Patent ID: 9527045
Filing Date: 2016-12-27
CPC Classification: B01D

Claim Text:
1. A method for producing a carbon molecular sieve (CMS) membrane, comprising the steps of forming films or hollow fibers made of a polyimide polymer or copolymer to produce a precursor membrane, and pyrolyzing the precursor membrane under conditions sufficient to form a CMS membrane, wherein: the polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units; each dianhydride-derived unit being the dianhydride-derived moiety of formula (I): at least 50% but not all of the diamine-derived units are the diamine-derived moiety of formula (A) with the balance of the diamine-derived units being the diamine-derived moiety of formula (H): each R X X X