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US5490871A
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Gas separation
Assignee: COX SHENIKWA D
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Filing: 1994-01-28
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Granted: 1996-02-13
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Expires: 2014-01-28
Abstract
Abstract During a purge step of a PSA plant the waste gas being vented is analyzed to identify when a preselected volume of the waste gas contains purge gas after which the purge step is stopped.
Inventors
- 👤 John R. Coates
- 👤 Paul W. Kingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:39
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/30; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2256/00; B01D2256/12; B01D2259/00; B01D2259/40; B01D2259/40007; B01D2259/40009
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A pressure swing adsorption method of producing a product gas from a feed gas mixture including the product gas comprising repeatedly performing a cycle of operations which includes the steps of: a) contacting the feed gas mixture with a bed of adsorbent material which adsorbs preferentially at least one other component of the feed gas mixture relative to the product gas. thereby producing said product gas as nonadsorbed component; b) desorbing the bed; c) purging the bed with said product gas; d) sensing when the gas leaving the bed during the purging step contains a preselected volume of said product gas; and e) on reaching the preselected volume stopping the purge step.
Claim 2
Dependent Claim
112 words
A pressure swing adsorption method of producing a product gas from a feed gas mixture including the product gas comprising repeatedly performing a cycle of operations which includes the steps of: a) contacting the feed gas mixture with a bed of adsorbent material which adsorbs preferentially at least one other component of the feed gas mixture relative to the product gas. thereby producing said product gas as nonadsorbed component; b) desorbing the bed; c) purging the bed with said product gas; d) sensing when the gas leaving the bed during the purging step contains a preselected volume of said product gas; and e) on reaching the preselected volume stopping the purge step.
Claim 3
Dependent Claim
44 words
A method as claimed in claim 1, in which there are a plurality of such beds of adsorbent material each operating on a similar cycle but sequenced to be out-of-phase with one another such that a substantially continuous supply of product gas is produced.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1 or 2, in which the feed gas mixture is air and the product gas is oxygen.
References Cited (Backward Citations)
US3775946A
Cited
US4197095A
Cited
US4315759A
Cited
US4440548A
Cited
US4648888A
Cited
US4472177A
Cited
US4631073A
Cited
US4693730A
Cited
US4917710A
Cited
US5071453A
Cited
US5207806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-12 | 1999-08-14 | 2000-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-12 | 2003-08-14 | 2004-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-12 | 2007-08-14 | 2008-02-13 | $7700.00 | Window Closed / Lapsed |