Polyimide gas separation membranes

Details Polyimide gas separation membranes Polyimide gas separation membranes

1986-10-27

1988-01-05

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 55158, 21050039, B01D 5322

Patent

active

047173947

ABSTRACT:
Semi-flexible aromatic polyimides, prepared by polycondensation of dianhydrides with diamines having alkyl substituents on all ortho positions to the amine functions, or with mixtures of diamines, some components having substituents on all positions ortho to the amine functions, are disclosed. Membranes formed from this class of polyimides have improved environmental stability and superior gas permeability. The range of gas permeation properties observed allows for the tailoring of membrane material for widely diverse gas separations. The high permeabilities of some gases from multicomponent mixtures is due to the optimization of the molecular free volume in the polymer.

REFERENCES:
patent: Re30351 (1980-07-01), Hoehn et al.
patent: 3816303 (1974-06-01), Wrasidlo
patent: 3822202 (1974-07-01), Hoehn
patent: 3925211 (1975-12-01), Schumann et al.
patent: 4113628 (1978-09-01), Alegranti
patent: 4240914 (1980-12-01), Iwama et al.
patent: 4358378 (1982-11-01), Iwama et al.
patent: 4370290 (1983-01-01), Makino et al.
patent: 4378324 (1983-03-01), Makino et al.
patent: 4378400 (1983-03-01), Makino et al.
patent: 4440643 (1984-04-01), Makino et al.
patent: 4460526 (1984-07-01), Makino et al.
patent: 4474662 (1984-10-01), Makino et al.
patent: 4474858 (1984-10-01), Makino et al.
patent: 4485056 (1984-11-01), Makino et al.
patent: 4486376 (1984-12-01), Makino et al.
patent: 4528004 (1985-07-01), Makino et al.
patent: 4532041 (1985-07-01), Shuey et al.
patent: 4578166 (1986-03-01), Uno et al.

Affiliated with

Also associated with

Rating

Polyimide gas separation membranes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polyimide gas separation membranes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyimide gas separation membranes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-6928