Patent US5034070A successfully refreshed from Google Patents.
Patent US4952219A successfully refreshed from Google Patents.
US4952219A
Expired / Lapsed
US
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Membrane drying of gas feeds to low temperature units
Assignee: Air Products and Chemicals Inc
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Filing: 1989-09-29
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Granted: 1990-08-28
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Expires: 2009-09-29
Abstract
Abstract A process is provided for the low temperature separation of a high purity gas product at lower power requirements by permeating a feed gas stream through a membrane having a water-to-gas-product selectivity of at least about 100, separating water from the gas stream, feeding the partially dried gas stream through a molecular sieve to remove residual water, and supplying the dried gas stream to a low temperature separation unit to separate gas product(s) from the gas stream.
Inventors
- 👤 Stephen P. DiMartino, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; B01D53/229; B01D53/26; B01D53/268
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A process for separating and recovering a product component from a feed gas mixture containing at least one other component and water, said process comprising: bringing said feed gas mixture into contact with a membrane having a water to product component selectivity of at least 100 to initially remove a portion of the water from the feed gas mixture to produce a partially dried gas stream, feeding the partially dried gas stream through a molecular sieve to remove remaining water to produce dry gas stream, supplying a dry gas stream to a low temperature separation unit to separate the product component from the dry gas stream, and subsequently recovering the product component.
Claim 2
Dependent Claim
112 words
A process for separating and recovering a product component from a feed gas mixture containing at least one other component and water, said process comprising: bringing said feed gas mixture into contact with a membrane having a water to product component selectivity of at least 100 to initially remove a portion of the water from the feed gas mixture to produce a partially dried gas stream, feeding the partially dried gas stream through a molecular sieve to remove remaining water to produce dry gas stream, supplying a dry gas stream to a low temperature separation unit to separate the product component from the dry gas stream, and subsequently recovering the product component.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the product component is nitrogen.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the membrane also separates carbon dioxide from the gas stream.
Claim 5
Dependent Claim
17 words
The process of claim 2 wherein the membrane has a water-to-nitrogen selectivity of at least about 125.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein the membrane has a water-to-nitrogen selectivity of at least about 250.
Claim 7
Dependent Claim
32 words
The process of claim 2 which comprises compressing the gas stream from which the nitrogen has been separated and feeding the compressed gas stream back to the membrane as a sweep stream.
Claim 8
Dependent Claim
45 words
The process of claim 2 which comprises compressing the gas stream from which the nitrogen has been separated, dividing it into two parts, feeding one part to the membrane as a sweep stream and feeding the other part to the molecular sieve to regenerate it.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the membrane is cellulose acetate.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein the membrane is a polysulfone.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the membrane is a polyimide.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein the membrane is a polytrimethylsilylpropyne.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein the membrane is a polytrimethylgermylpropyne.
Claim 14
Dependent Claim
14 words
The process of claim 1 wherein the membrane is a multicomponent gas separation membrane.
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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) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |