Patent ID: 7479227

Claim:
A pervaporation process for separating a first component from a liquid organic mixture, comprising the steps of: a) passing the liquid organic mixture across 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 cyclic structure of an at least 5-member fluorinated ring, the polymer having a fractional free volume less than 0.3, a glass transition temperature of at least about 100° C., and an oxygen permeability below 800 Barrer; (b) providing a driving force for transmembrane permeation; (c) withdrawing from the permeate side a permeate vapor stream enriched in the first component compared to the liquid organic mixture; (d) withdrawing from the feed side a residue liquid stream depleted in the first component compared to the liquid organic mixture.