Carbon molecular sieve membrane from a microporous spirobisindane-based polyimide precursor with enhanced ethylene/ethane mixed-gas selectivity

Abstract

A highly selective carbon molecular sieve (CMS) membrane derived from a novel spirobisindane-based polyimide was synthesized. The mixed-gas ethylene/ethane selectivity of 15.6 at 20 bar is the highest reported value for CMS-type membranes to date.