Composite films adapted for selective gas separation.

摘要

A gas-permeable composite film comprising a gas-selective film consisting of at least one layer for separating and concentrating an intended gas from mixed gases, and a covering layer formed on the selective film. The covering layer has a critical surface tension not larger than 30 dyne cm and a contact angle of water of not smaller than 90 DEG . A method of regenerating the film used over a long term is also described in which the used film is contacted with an organic liquid medium inert to the material for the film.