Patent US4500667A successfully refreshed from Google Patents.
US4500667A
Expired / Lapsed
US
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Polymer blended membranes
Assignee: Honeywell UOP LLC
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Filing: 1983-10-26
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Granted: 1985-02-19
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Expires: 2003-10-26
Abstract
Abstract Gas separation membranes comprising an organic polymer-inorganic compound blend may be prepared by admixing an organic polymer such as poly(vinyl alcohol) with a heteropoly acid or salt thereof such as dodecamolybdophosphoric acid in a mutually miscible solvent. After allowing the mixture to react for a period of time sufficient to form a blend, the solution may be cast on an appropriate casting surface and, after the solvent has been evaporated, the desired membrane which may have a thickness of from about 1 to about 50 microns is recovered.
Inventors
- 👤 Anthony J. Polak
- 👤 Allyson J. Beuhler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:56
CPC Classifications
B; B01; B01D; B01D71/00; B01D69/00; B01D69/14; B01D69/141; C; C08; C08K; C08K3/00; C08K3/18; C08K3/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
A thin film membrane which comprises a blend of: (1) from about 10% to about 70% by weight of a heteropoly acid and salts thereof having the generic formula: A.sub.m [X.sub.x Y.sub.y O.sub.z ].nH.sub.2 O in which X is selected from the group consisting of boron, aluminum, gallium, silicon, germanium, tin, phosphorus, arsenic, antimony, bismuth, selenium, tellurium, iodine, and metals of the first, second, third and fourth transitional metal series of the Periodic Table and where Y is dissimilar from X and is selected from at least one metal of the first, second, third and fourth transitional metal series of the Periodic Table, A is selected from the group consisting of hydrogen, ammonium, sodium, potassium, lithium, rubidium, cesium, beryllium, magnesium, calcium, strontium and barium, m is an integer of from about 1 to 10, y is an integer of from 6 to 12 based on x being equal to 1, z is an integer of from 30 to 80 and n is an integer of from 3 to 100 and, (2) from about 90% to about 30% by weight of a polymer compatible with said compound selected from the group consisting of poly (vinyl alcohol), poly(vinyl fluoride), polyethylene oxide, polyethyleneinine, polyvinylmethylethyl ether and phenol formaldehyde resins.
Claim 2
Dependent Claim
206 words
A thin film membrane which comprises a blend of: (1) from about 10% to about 70% by weight of a heteropoly acid and salts thereof having the generic formula: A.sub.m [X.sub.x Y.sub.y O.sub.z ].nH.sub.2 O in which X is selected from the group consisting of boron, aluminum, gallium, silicon, germanium, tin, phosphorus, arsenic, antimony, bismuth, selenium, tellurium, iodine, and metals of the first, second, third and fourth transitional metal series of the Periodic Table and where Y is dissimilar from X and is selected from at least one metal of the first, second, third and fourth transitional metal series of the Periodic Table, A is selected from the group consisting of hydrogen, ammonium, sodium, potassium, lithium, rubidium, cesium, beryllium, magnesium, calcium, strontium and barium, m is an integer of from about 1 to 10, y is an integer of from 6 to 12 based on x being equal to 1, z is an integer of from 30 to 80 and n is an integer of from 3 to 100 and, (2) from about 90% to about 30% by weight of a polymer compatible with said compound selected from the group consisting of poly (vinyl alcohol), poly(vinyl fluoride), polyethylene oxide, polyethyleneinine, polyvinylmethylethyl ether and phenol formaldehyde resins.
Claim 3
Dependent Claim
23 words
The membrane as set forth in claim 1 in which said membrane possesses a thickness of from about 0.1 to about 50 microns.
Claim 4
Dependent Claim
22 words
The membrane as set forth in claim 1 in which said polymer comprises poly(vinyl alcohol) and said heteropoly acid comprises dodecamolybdophosphoric acid.
Claim 5
Dependent Claim
22 words
The membrane as set forth in claim 1 in which said polymer comprises poly(vinyl alcohol) and said heteropoly acid comprises dodecatungstophosphoric acid.
Claim 6
Dependent Claim
22 words
The membrane as set forth in claim 1 in which said polymer comprises cellulose acetate and said heteropoly acid comprises dodecamolybdophosphoric acid.
Claim 7
Dependent Claim
22 words
The membrane as set forth in claim 1 in which said polymer comprises poly(vinyl alcohol) and said heteropoly salt comprises uranyl orthophosphate.
Claim 8
Dependent Claim
22 words
The membrane as set forth in claim 1 in which said polymer comprises poly(vinyl alcohol) and said heteropoly salt comprises ammonium phosphomolybdate.
References Cited (Backward Citations)
US4024036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |