Gas Separation Membranes Based on Fluorinated and Perfluorinated Polymers

摘要

A process for separating components of a gas mixture using gas-separation copolymer membranes. These membranes use a selective layer made from copolymers of partially fluorinated or perfluorinated dioxolane monomers and a second monomer, such as dioxane or a partially fluorinated dioxolane. The resulting membranes have superior selectivity performance for gas pairs of interest while maintaining fast gas permeance compared to membranes prepared using conventional perfluoropolymers, such as Teflon® AF, Hyflon® AD, and Cytop®.

主权项

1. A process for separating two components, A and B, of a gas fluid mixture having a ratio (Rf) of A:B, comprising:
(a) passing the gas mixture across a separation membrane having a feed side and a permeate side, the separation membrane having a selective layer comprising a copolymer comprising a perfluorinated dioxolane monomer and a perfluorinated dioxane monomer; (b) providing a driving force for transmembrane permeation; (c) withdrawing from the permeate side a permeate stream having a ratio (Rp) of A:B, where Rp>Rf; and (d) withdrawing from the feed side a residue stream having a ratio (Rr) of A:B, where Rr