초록

A permselective polyimide membrane having phenylindane residues incorporated into the polyimide backbone chain exhibiting high selectivity while maintaining good gas permeation rates and a process for using.

대표청구항 ▼

A process of separating a component from a mixture of gases having high selectivity and gas permeation rates comprising bringing the mixture into contact with a feed side of a permselective composite or asymmetric membrane in a manner to cause a portion of the mixture to pass through the membrane to

A process of separating a component from a mixture of gases having high selectivity and gas permeation rates comprising bringing the mixture into contact with a feed side of a permselective composite or asymmetric membrane in a manner to cause a portion of the mixture to pass through the membrane to a permeate side, the resulting gas mixture on the permeate side being enriched in the component over that of the mixture on the feed side; the membrane being formed from a polyimide polymer having incorporated into the repeating polymer unit a phenylindane residue of the form; [Figure] wherein R, R1 and R2 are independently －H or lower alkyl having from 1 to 6 carbon atoms. An asymmetric membrane formed of a polyimide polymer having incorporated into the repeating polymer unit a phenylindane residue of the form: [Figure] wherein R, R1 and R2 are independently －H or lower alkyl having from 1 to 6 carbon atoms.