Patent US4486202A successfully refreshed from Google Patents.
US4486202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetric gas separation membranes
Assignee: Permea Inc
•
Filing: 1983-06-30
•
Granted: 1984-12-04
•
Expires: 2003-06-30
Abstract
Abstract Asymmetric gas separation membranes of materials having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture, exhibit significantly improved permeation selectivities for the at least one gas when the asymmetric membrane is contacted on one or both surfaces with an effective amount of a Lewis acid. The improved asymmetric gas separation membranes, process for producing the improved membrane, and processes utilizing such membranes for selectively separating at least one gas from a gaseous mixture by permeation are disclosed.
Inventors
- 👤 Raymond F. Malon
- 👤 Anthony Zampini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:36
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
An asymmetric gas separation membrane exhibiting improved gas separation selectivity comprising, a preformed asymmetric separation membrane of material having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture which has been contacted on one or both surfaces with an effective amount of a Lewis acid, wherein with respect to the at least one gas, the acid contacted membrane exhibits a separation factor greater than the separation factor exhibited by the membrane before acid contact.
Claim 2
Dependent Claim
88 words
An asymmetric gas separation membrane exhibiting improved gas separation selectivity comprising, a preformed asymmetric separation membrane of material having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture which has been contacted on one or both surfaces with an effective amount of a Lewis acid, wherein with respect to the at least one gas, the acid contacted membrane exhibits a separation factor greater than the separation factor exhibited by the membrane before acid contact.
Claim 3
Dependent Claim
27 words
The improved asymmetric gas separation membrane of claim 1 wherein the separation factor for the one gas of the gas mixture is increased by at least 100%.
Claim 4
Dependent Claim
46 words
The improved asymmetric gas separation membrane of claim 1 wherein the material of the asymmetric membrane is comprised of a material selected from the group consisting of polymers and copolymers and substituted polymers of polyethers, polysulfones, polyaryleneoxides, polyethersulfones, cellulose esters, and copolymers of styrene and acrylonitrile.
Claim 5
Dependent Claim
33 words
The improved asymmetric gas separation membrane of claim 1 wherein the at least one gas is selected from the group consisting of carbon monoxide, nitrogen, oxygen, helium, methane, ethane, hydrogen, and carbon dioxide.
Claim 6
Dependent Claim
40 words
The improved asymmetric gas separation membrane according to claim 1 wherein the separation factor for the separation of hydrogen from a gaseous mixture comprised of hydrocarbons of 1 to about 5 carbon atoms is improved by at least about 200%.
Claim 7
Dependent Claim
103 words
A multicomponent gas separation membrane exhibiting improved gas separation selectivity and resistance to hydrocarbons degradation, comprising, an asymmetric membrane coated with one or more materials, said membrane having selective permeation of at least one of a gaseous mixture over that of one or more remaining gases of the gaseous mixture which has been contacted on one or both surfaces with an effective amount of a Lewis acid, wherein with respect to the at least one gas, the acid contacted multicomponent gas separation membrane exhibits an improved separation factor greater than the separation factor exhibited by the multicomponent gas separation membrane before acid treatment.
Claim 8
Dependent Claim
103 words
A multicomponent gas separation membrane exhibiting improved gas separation selectivity and resistance to hydrocarbons degradation, comprising, an asymmetric membrane coated with one or more materials, said membrane having selective permeation of at least one of a gaseous mixture over that of one or more remaining gases of the gaseous mixture which has been contacted on one or both surfaces with an effective amount of a Lewis acid, wherein with respect to the at least one gas, the acid contacted multicomponent gas separation membrane exhibits an improved separation factor greater than the separation factor exhibited by the multicomponent gas separation membrane before acid treatment.
References Cited (Backward Citations)
US3657113A
Cited
US3616607A
Cited
US4199445A
Cited
US3745202A
Cited
US3775308A
Cited
US3954925A
Cited
US3980456A
Cited
US4230463A
Cited
US4371487A
Cited
US4340480A
Cited
US4364759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |