US5490871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation
Assignee: COX SHENIKWA D
•
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
2026-11-03 14:40
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.
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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) | 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 |