Patent ID: 6544316
Filing Date: 2003-04-08
Classification: B01D

Abstract:
A process for separating hydrogen from a gaseous hydrocarbon in a multicomponent gas mixture comprising hydrogen, the gaseous hydrocarbon, and a third gaseous component, the process comprising the steps of:(a) bringing the gas mixture into contact with the feed side of a separation membrane having a feed side and a permeate side, the separation membrane having a selective layer comprising: a polymer comprising repeat units of a fluorinated cyclic structure of an at least 5-member ring, the polymer having a fractional free volume no greater than about 0.3; (b) providing a driving force for transmembrane permeation; (c) withdrawing from the permeate side a permeate stream enriched in hydrogen compared to the gas mixture; (d) withdrawing from the feed side a residue stream depleted in hydrogen compared to the gas mixture.