Patent US4758251A successfully refreshed from Google Patents.
US4758251A
Expired / Lapsed
US
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Separation of gases through gas enrichment membrane composites
Assignee: Honeywell International Inc
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Filing: 1987-07-27
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Granted: 1988-07-19
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Expires: 2007-07-27
Abstract
Abstract Thin film composite membranes having as a permselective layer a film of a homopolymer of certain vinyl alkyl ethers are useful in the separation of various gases. Such homopolymers have a molecular weight of greater than 30,000 and the alkyl group of the vinyl alkyl monomer has from 4 to 20 carbon atoms with branching within the alkyl moiety at least at the carbon atom bonded to the ether oxygen or at the next adjacent carbon atom. These membranes show excellent hydrolytic stability, especially in the presence of acidic or basic gaseous components.
Inventors
- 👤 Raymond J. Swedo
- 👤 Paul R. Kurek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:32
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/38
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
108 words
A process for the separation of a gas from a gaseous mixture containing said gas comprising passing a stream of the mixture over the surface of a membrane at separation conditions, where the membrane is a thin film composite comprising a porous support backing material having a thin film of a homopolymer of a vinyl alkyl ether composited on the surface of the support and where the alkyl moiety is a branched chain containing from 4 to about 20 carbon atoms with branching at least on the carbon bonded to the ether oxygen or the carbon adjacent thereto, and recovering at least the permeate enriched in said gas.
Claim 2
Dependent Claim
108 words
A process for the separation of a gas from a gaseous mixture containing said gas comprising passing a stream of the mixture over the surface of a membrane at separation conditions, where the membrane is a thin film composite comprising a porous support backing material having a thin film of a homopolymer of a vinyl alkyl ether composited on the surface of the support and where the alkyl moiety is a branched chain containing from 4 to about 20 carbon atoms with branching at least on the carbon bonded to the ether oxygen or the carbon adjacent thereto, and recovering at least the permeate enriched in said gas.
Claim 3
Dependent Claim
36 words
The process of claim 1 in which the separation conditions include a temperature in the range from about ambient to about 70° C. and a pressure from about 20 to about 100 pounds per square inch.
Claim 4
Dependent Claim
42 words
The process of claim 1 where the porous support backing material is selected from the group consisting of polysulfones, sulfonated polysulfones, blends of polysulfone and sulfonated poly(ether sulfone), polycarbonates, microporous polypropylene, polyamides, polyphenylene oxide, polyesters, canvas, cotton, and linen, or combinations thereof.
Claim 5
Dependent Claim
14 words
The process of claim 3 where the porous support backing material is a polysulfone.
Claim 6
Dependent Claim
24 words
The process of claim 3 where the porous support backing material is a sulfonated polysulfone or a blend of polysulfone and sulfonated poly(ether sulfone).
Claim 7
Dependent Claim
27 words
The process of claim 1 where the thin film is a homopolymer of a vinyl alkyl ether where the alkyl moiety contains 4 to 8 carbon atoms.
Claim 8
Dependent Claim
16 words
The process of claim 6 where the thin film is a homopolymer of vinyl isobutyl ether.
Claim 9
Dependent Claim
16 words
The process of claim 6 where the thin film is a homopolymer of vinyl sec-butyl ether.
Claim 10
Dependent Claim
22 words
The process of claim 1 where the gas mixture consists essentially of oxygen and nitrogen and the permeate is enriched in oxygen.
Claim 11
Dependent Claim
16 words
The process of claim 1 where the homopolymer has a molecular weight of at least 30,000.
Claim 12
Dependent Claim
18 words
The process of claim 10 where the homopolymer has a molecular weight from about 200,000 to about 1,000,000.
Claim 13
Dependent Claim
83 words
A membrane which is a thin film composite comprising a porous support backing material having a thin film of thickness from about 100 to about 10,000 Angstroms of a homopolymer of a vinyl alkyl ether composited thereon where the alkyl moiety is a branched chain containing from 4 to about 20 carbon atoms with branching at least at the carbon atom bonded to the ether oxygen or the carbon atom adjacent thereto, and the homopolymer has a molecular weight of at least 30,000.
Claim 14
Dependent Claim
83 words
A membrane which is a thin film composite comprising a porous support backing material having a thin film of thickness from about 100 to about 10,000 Angstroms of a homopolymer of a vinyl alkyl ether composited thereon where the alkyl moiety is a branched chain containing from 4 to about 20 carbon atoms with branching at least at the carbon atom bonded to the ether oxygen or the carbon atom adjacent thereto, and the homopolymer has a molecular weight of at least 30,000.
Claim 15
Dependent Claim
42 words
The membrane of claim 12 where the porous support backing material is selected from the group consisting of polysulfones, sulfonated polysulfones, blends of polysulfone and sulfonated poly(ether sulfone), polycarbonates, microporous polypropylene, polyamides, polyphenylene oxide, polyesters, canvass, cotton, and linen, or combinations thereof.
Claim 16
Dependent Claim
14 words
The membrane of claim 13 where the porous support backing material is a polysulfone.
Claim 17
Dependent Claim
24 words
The membrane of claim 13 where the porous support backing material is a sulfonated polysulfone or a blend of polysulfone and sulfonated poly(ether sulfone).
Claim 18
Dependent Claim
28 words
The membrane of claim 12 where the thin films a homopolymer of a vinyl alkyl ether where the alkyl moiety contains from 4 to about 8 carbon atoms.
Claim 19
Dependent Claim
16 words
The membrane of claim 16 where the thin film is a homopolymer of vinyl isobutyl ether.
Claim 20
Dependent Claim
16 words
The membrane of claim 16 where the thin film is a homopolymer of vinyl sec-butyl ether.
Claim 21
Dependent Claim
18 words
The membrane of claim 12 where the homopolymer has a molecular weight of from 200,000 to about 1,000,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |