US5114440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the adsorptive oxygen-enrichment of air with mixtures of ca zeolite a molecular sieves by means of vacuum swing adsorption
Assignee: Bayer AG
•
Filing: 1991-03-19
•
Granted: 1992-05-19
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Expires: 2011-03-19
Abstract
Abstract A process for oxygen-enrichment of air by means of vacuum swing adsorption (VSA) using Ca zeolite A molecular sieves, the improvement wherein the adsorbers of the VSA units are filled with Ca zeolite A molecular sieves which have different adsorption characteristics.
Inventors
- 👤 Gerhard Reiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:11
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0259; C01B13/0262; C01B13/027; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/30; B01D2253/302; B01D2256/00; B01D2256/10; B01D2257/00; B01D2257/10; B01D2257/104; B01D2259/00; B01D2259/40; B01D2259/403; B01D53/047; B01D53/0476; C01B2210/00; C01B2210/0043; C01B2210/0046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
In a process for oxygen-enrichment of air by means of vacuum swing adsorption (VSA) with adsorbers containing Ca zeolite A molecular sieves, the improvement wherein the adsorbers of the VSA units are filled with separate layers of Ca zeolite A molecular sieves which have different adsorption characteristics.
Claim 2
Dependent Claim
47 words
In a process for oxygen-enrichment of air by means of vacuum swing adsorption (VSA) with adsorbers containing Ca zeolite A molecular sieves, the improvement wherein the adsorbers of the VSA units are filled with separate layers of Ca zeolite A molecular sieves which have different adsorption characteristics.
Claim 3
Dependent Claim
73 words
Process according to claim 1, wherein the adsorber has a crude gas intake end, which is a bottom layer of the adsorber, and an O 2 product end, which is a top layer of the adsorber, the crude gas intake end consists of Ca zeolite A adsorbent having the lowest adsorption capacity for nitrogen and the O 2 product end consists of Ca zeolite A adsorbent having the highest adsorption capacity for nitrogen.
Claim 4
Dependent Claim
33 words
Process according to claim 2, wherein a transition of the zeolite qualities from the adsorber crude gas intake end to the adsorber O 2 product end is effected virtually smoothly through several layers.
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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) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |