Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-06-13
1991-10-29
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 68, 55158, B01D 5322, B01D 7164
Patent
active
050612980
ABSTRACT:
The present invention is a class of semi-permeable polymeric membranes and processes for using such membranes to separate one or more components of a gas mixture. The membranes which are formed from a polymer blend of a first polyimide containing an aromatic diamine and a second polyimide containing an alkenylated diamine having an allyl or allylaryl group exhibit high gas perm-selectivities. The polyimide blends can be surface modified by treatment with an activating force such as high energy electromagnetic irradiation or with a free radical source to impart enhanced selectivity to the membrane without causing a large decrease in composite permeance. These membranes formed from polyimide blends are especially useful in effecting the separation of oxygen and nitrogen from air.
REFERENCES:
patent: Re30351 (1980-07-01), Hoehn et al.
patent: 3822202 (1974-07-01), Hoehn
patent: 4180552 (1979-12-01), Graham et al.
patent: 4378400 (1983-03-01), Makino et al.
patent: 4528004 (1985-07-01), Makino et al.
patent: 4657564 (1987-04-01), Langsam
patent: 4690873 (1987-09-01), Makino et al.
patent: 4705540 (1987-11-01), Hayes
patent: 4717393 (1988-01-01), Hayes
patent: 4717394 (1988-01-01), Hayes
patent: 4746474 (1988-05-01), Kohn
patent: 4830640 (1989-05-01), Nakamura et al.
patent: 4838900 (1989-06-01), Hayes
patent: 4880442 (1989-11-01), Hayes
patent: 4897092 (1990-01-01), Burgoyne, Jr. et al.
patent: 4929405 (1990-05-01), Kohn
patent: 4932982 (1990-06-01), Hayes
patent: 4932983 (1990-06-01), Hayes
patent: 4948400 (1990-08-01), Yamada et al.
patent: 4952220 (1990-08-01), Langsam et al.
patent: 4954144 (1990-09-01), Burgoyne, Jr. et al.
patent: 4981497 (1991-01-01), Hayes
Kim et al., "Reverse Permselectivity" of N.sub.2 over CH.sub.4 in "Aromtic Polyimides", J. Appl. Poly Sci., vol. 34, (1987), p. 1767-1771.
Bott Richard H.
Burgoyne, Jr William F.
Langsam Michael
Air Products and Chemicals Inc.
Gourley Keith D.
Marsh William F.
Simmons James C.
Spitzer Robert
LandOfFree
Gas separating membranes formed from blends of polyimide polymer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas separating membranes formed from blends of polyimide polymer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas separating membranes formed from blends of polyimide polymer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1397623