US4875908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for selectively separating gaseous mixtures containing water vapor
Assignee: Individual
•
Filing: 1989-01-26
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Granted: 1989-10-24
•
Expires: 2009-01-26
Abstract
Abstract A process for selectively separating water vapor from a multiple component gaseous mixture is provided. The process comprises passing a multicomponent gaseous mixture including water vapor along and in contact with a membrane which is selectively permeable to water vapor and wherein the water vapor permeation rate Q H .sbsb.2 O is greater than 30 Nm 3 /m 2 ·hr·atm at 25° C. and the ratio of Q H .sbsb.2 O to the permeation rate Q G of the gas to be separated from the water vapor, i.e., Q H .sbsb.2 O Q G , is greater than 10,000. The membrane preferably has a thickness of about 0.1 microns to about 50 microns.
Inventors
- 👤 Hiroyasu Kikukawa
- 👤 Eiji Shimoda
- 👤 Mari Sakai
- 👤 Fumiko Kitada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; B01D53/228; B01D53/26; B01D53/268; B01D69/00; B01D69/02; B01D71/00; B01D71/06; B01D71/76; B01D71/30; B01D71/32
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
97 words
A process for selectively separating water vapor from a multiple component gaseous mixture, said process comprising passing a multicomponent gaseous mixture including water vapor along and in contact with a membrane which is selectively permeable to water vapor and wherein the water vapor permeation rate Q H .sbsb.2 O is greater than 30 Nm 3 /m 2 ·hr·atm at 25° C. and the ratio of Q H .sbsb.2 O to the permeation rate Q G of the gas to be separated from said water vapor, i.e., Q H .sbsb.2 O /Q G , is greater than 10,000.
Claim 2
Dependent Claim
97 words
A process for selectively separating water vapor from a multiple component gaseous mixture, said process comprising passing a multicomponent gaseous mixture including water vapor along and in contact with a membrane which is selectively permeable to water vapor and wherein the water vapor permeation rate Q H .sbsb.2 O is greater than 30 Nm 3 /m 2 ·hr·atm at 25° C. and the ratio of Q H .sbsb.2 O to the permeation rate Q G of the gas to be separated from said water vapor, i.e., Q H .sbsb.2 O /Q G , is greater than 10,000.
Claim 3
Dependent Claim
22 words
The process of claim 1 where the water vapor permeation rate Q H .sbsb.2 O exceeds 80 Nm 3 /m 2 ·hr·atm.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein said membrane comprises a fluororesin copolymer which contains a hydrophilic functional group.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said functional group is a sulfonic acid group.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein said functional group is a sulfonate group.
Claim 7
Dependent Claim
14 words
The process of claim 3 wherein said functional group is a sulfuric acid group.
Claim 8
Dependent Claim
14 words
The process of claim 3 wherein said functional group is a carboxylic acid group.
Claim 9
Dependent Claim
13 words
The process of claim 3 wherein said functional group is a carboxylate group.
Claim 10
Dependent Claim
14 words
The process of claim 3 wherein said functional group is an ammonium salt group.
Claim 11
Dependent Claim
28 words
The process of claim 1 wherein said membrane is a composite membrane comprising a fluororesin copolymer film which contains a hydrophilic functional group laminated to a support layer.
Claim 12
Dependent Claim
16 words
The process of claim 10 wherein said support layer is a sheet of porous, expanded polytetrafluoroethylene.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein said support layer is a sheet of cellulose.
Claim 14
Dependent Claim
15 words
The process of claim 10 wherein said support layer is a sheet of porous polyolefin.
Claim 15
Dependent Claim
14 words
The process of claim 10 wherein said support layer is a sheet of polyester.
Claim 16
Dependent Claim
14 words
The process of claim 10 wherein said support layer is a sheet of polysulfonate.
Claim 17
Dependent Claim
12 words
The process of claim 10 wherein said support layer is a fabric.
Claim 18
Dependent Claim
10 words
The process of claim 16 wherein said fabric is woven.
Claim 19
Dependent Claim
10 words
The process of claim 16 wherein said fabric is nonwoven.
Claim 20
Dependent Claim
10 words
The process of claim 16 wherein said fabric is knitted.
Claim 21
Dependent Claim
18 words
The process of claim 1 wherein said membrane has a thickness of about 0.1 to about 50 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |