Patent ID: 8911534

Claim:
An ethane/ethylene separation membrane prepared by a process comprising dissolving an amount of 3,3′,4,4′-benzophenone tetracarboxylic dianhydride 5(6)-amino-1-(4′-aminopheny)-1,3,3-trimethylindane in a solvent such that a solution is formed; forming asymmetric hollow fiber precursors from the solution; at least partially drying the asymmetric hollow fiber precursors with a second solvent; solvent-exchanging the asymmetric hollow fiber precursors in hexane; and at least partially pyrolyzing the asymmetric hollow fiber precursors under vacuum or in an inert atmosphere to form an asymmetric hollow fiber carbon molecular sieve membrane therefrom, the asymmetric hollow fiber carbon molecular sieve membrane having an ethylene permeance of at least 0.25 Gas Permeation Units and an ethylene/ethane selectivity of at least 6.3.