Patent US5549733A successfully refreshed from Google Patents.
US5549733A
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Process for the production of a gas by adsorption
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1995-03-24
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Granted: 1996-08-27
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Expires: 2015-03-24
Abstract
Abstract In a "vacuum" type cycle, the depressurization of a first adsorber at the high pressure of the cycle is effected by placing it in communication with the outlet of a second adsorber at the low pressure of the cycle. This communication takes place simultaneously with countercurrent pumping in a first stage for the second adsorber and in a second stage for the first adsorber, the recompression to the high pressure of the cycle being effected by production gas. Used for the production of oxygen from air.
Inventors
- 👤 Christine Marot
- 👤 Pierre Petit
- 👤 Xavier Vigor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; C; C01; C01B; C01B13/00; C01B13/02; B01D2256/00; B01D2256/12; B01D2259/00; B01D2259/40; B01D2259/40011; B01D2259/40028; B01D2259/4003; B01D2259/40058; B01D2259/40067; B01D2259/40077; B01D2259/40081; B01D2259/403; B01D2259/41
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A process for the production of a less-adsorbable gas from a gaseous mixture containing said less-adsorbable gas in an adsorption system comprising three adsorbers, each adsorber subject to a pressure swing adsorption cycle comprising the following successive steps: a) a production step substantially at a high pressure of the cycle with co-current admission of the gaseous mixture and production of the less adsorbable gas as a product gas; b) a first depressurization co-current towards another adsorber in its step e); c) a second depressurization counter-current and simultaneously co-current towards another adsorber in its step f); d) a third depressurization counter-current, down to a low pressure of the cycle; e) an elution counter-current with gas from another adsorber in its step b); f) a first recompression counter-current with gas from another adsorber in its step c); and g) a second recompression counter-current with product gas up to substantially the high pressure of the cycle.
Claim 2
Dependent Claim
153 words
A process for the production of a less-adsorbable gas from a gaseous mixture containing said less-adsorbable gas in an adsorption system comprising three adsorbers, each adsorber subject to a pressure swing adsorption cycle comprising the following successive steps: a) a production step substantially at a high pressure of the cycle with co-current admission of the gaseous mixture and production of the less adsorbable gas as a product gas; b) a first depressurization co-current towards another adsorber in its step e); c) a second depressurization counter-current and simultaneously co-current towards another adsorber in its step f); d) a third depressurization counter-current, down to a low pressure of the cycle; e) an elution counter-current with gas from another adsorber in its step b); f) a first recompression counter-current with gas from another adsorber in its step c); and g) a second recompression counter-current with product gas up to substantially the high pressure of the cycle.
Claim 3
Dependent Claim
22 words
The process of claim 1, further comprising effecting the counter-current depressurization and elution in steps c) , d) and e) by pumping.
Claim 4
Dependent Claim
18 words
Process according to claim 1, wherein the high pressure of the cycle is slightly greater than atmospheric pressure.
Claim 5
Dependent Claim
33 words
Process according to claim 1, wherein the duration of steps c), d) and e) is equal to k×T3, T being the total duration and k a whole number at least equal to 1.
Claim 6
Dependent Claim
15 words
Process according to claim 4, wherein the duration of step a) is equal to k×T/3.
Claim 7
Dependent Claim
16 words
Process according to claim 1, wherein the gas is oxygen, and the gaseous mixture is air.
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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) | 1999-08-27 | 2000-02-26 | 2000-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-27 | 2004-02-26 | 2004-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-27 | 2008-02-26 | 2008-08-27 | $7700.00 | Window Closed / Lapsed |