US6059858A
Expired / Lapsed
US
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High temperature adsorption process
Assignee: Messer LLC
•
Filing: 1998-10-20
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Granted: 2000-05-09
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Expires: 2018-10-20
Abstract
Abstract Oxygen is removed from gas streams by subjecting the gas stream to a pressure swing adsorption process carried out at temperature in the range of 300 to 1400° C. using as adsorbent a perovskite material having the structural formula A 1-x M x BO 3- δ, where A is a rare earth ion, M is Na, Ca, Sr, Ba or mixtures of these, B is Co, Mn, Cr or Fe, x varies from 0.1 to 1 and δ is the deviation from stoichiometric composition resulting from the substitution of Sr, Ca and Ba for rare earth ions.
Inventors
- 👤 Yue-Sheng Lin
- 👤 Donald L. MacLean
- 👤 Yongxian Zeng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:39
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/04; C01B21/0405; C01B21/0433; C01B21/045; C01B21/0455; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/22; B01D53/228; B01J; B01J20/00; B01J20/02; B01J20/06; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; C01B13/0255; C01B13/0259; C01B13/0262; B01D2253/00; B01D2253/10; B01D2256/00; B01D2256/10; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/104; B01D2257/50; B01D2257/504; B01D2257/80; B01D2259/00; B01D2259/40; B01D2259/40007; B01D2259/40009; B01D2259/40011; B01D2259/40043; B01D2259/4005; B01D2259/40056; C01B2210/00; C01B2210/0043; C01B2210/0046; C01B2210/0051; C01B2210/0062; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
110 words
A process for separating oxygen from a gas mixture at a temperature in the range of about 300 to about 1400° C. comprising (a) passing said gas mixture through at least one adsorption zone containing an oxygen-selective mixed conductor at an absolute pressure in the range of about 1 to about 50 bara, thereby preferentially adsorbing oxygen from said gas mixture, and (b) desorbing oxygen from said oxygen-selective mixed conductor by: (1) reducing the pressure in said at least one adsorption zone to about 10 -3 to about 5 bara; (2) purging said at least one adsorption zone with a substantially oxygen-free gas; or (3) combinations of (1) and (2).
Claim 2
Dependent Claim
110 words
A process for separating oxygen from a gas mixture at a temperature in the range of about 300 to about 1400° C. comprising (a) passing said gas mixture through at least one adsorption zone containing an oxygen-selective mixed conductor at an absolute pressure in the range of about 1 to about 50 bara, thereby preferentially adsorbing oxygen from said gas mixture, and (b) desorbing oxygen from said oxygen-selective mixed conductor by: (1) reducing the pressure in said at least one adsorption zone to about 10 -3 to about 5 bara; (2) purging said at least one adsorption zone with a substantially oxygen-free gas; or (3) combinations of (1) and (2).
Claim 3
Dependent Claim
22 words
The process of claim 1, further comprising repeatedly performing steps (a) and (b) in sequence as steps of a cyclic adsorption process.
Claim 4
Dependent Claim
142 words
The process of claim 2, wherein said oxygen-selective mixed conductor is selected from the group consisting of: (2a) perovskite substances having the structural formula A 1-x M x BO 3- δ, where A is a rare earth ion, M is Na, Ca, Sr, Ba or mixtures of these, B is Co, Mn, Cr, Fe or mixtures of these, x varies from 0 to 1 and δ is the deviation from stoichiometric composition resulting from the substitution of Sr, Ca and Ba for rare earth ions; (2b) ceramic substances selected from the group consisting of Bi 2 O 3 , ZrO 2 , CeO 2 , ThO 2 , HfO 2 and mixtures of these, the ceramic substance being doped with CaO, rare earth metal oxides or mixtures of these; (2c) brownmillerite oxide; and (2d) mixtures of any of (2a), (2b) and (2c).
Claim 5
Dependent Claim
16 words
The process of claim 3, wherein said oxygen-selective mixed conductor is a perovskite substance of (2a).
Claim 6
Dependent Claim
13 words
The process of claim 4, wherein x varies from about 0.1 to 1.
Claim 7
Dependent Claim
14 words
The process of claim 4, wherein A is La, Y or mixtures of these.
Claim 8
Dependent Claim
14 words
The process of claim 4, wherein M is Ca, Sr or mixtures of these.
Claim 9
Dependent Claim
14 words
The process of claim 4, wherein B is Co, Fe or mixtures of these.
Claim 10
Dependent Claim
31 words
The process of claim 4, wherein A is La, Y or mixtures of these, M is Ca, Sr or mixtures of these and B is Co, Fe or mixtures of these.
Claim 11
Dependent Claim
11 words
The process of claim 9, wherein x is 0.2 to 1.
Claim 12
Dependent Claim
56 words
The process of claim 3, wherein said oxygen-selective mixed conductor is a ceramic substance of (2b), said ceramic substance being doped with a rare earth metal oxide selected from the group consisting of Y 2 O 3 , Nb 2 O 3 , Sm 2 O 3 , Gd 2 O 3 and mixtures of these.
Claim 13
Dependent Claim
27 words
The process of claim 3, wherein said at least one adsorption zone contains particulate material having a thermal conductivity greater than that of said oxygen-selective mixed conductor.
Claim 14
Dependent Claim
16 words
The process of claim 12, wherein said particulate material is mixed with said oxygen-selective mixed conductor.
Claim 15
Dependent Claim
19 words
The method of claim 12, wherein said particulate material and said oxygen-selective mixed conductor are formed into alternating layers.
Claim 16
Dependent Claim
19 words
The process of claim 3, wherein moisture selective adsorbent is positioned upstream or downstream of said oxygen-selective mixed conductor.
Claim 17
Dependent Claim
31 words
The process of claim 15, wherein particulate material having a thermal conductivity greater than that of said oxygen-selective mixed conductor is positioned between said moisture-selective adsorbent and said oxygen-selective mixed conductor.
Claim 18
Dependent Claim
20 words
The process of claim 3, wherein carbon dioxide selective adsorbent is positioned upstream or downstream of said oxygen-selective mixed conductor.
Claim 19
Dependent Claim
31 words
The process of claim 17, wherein particulate material having a thermal conductivity greater than that of said oxygen-selective mixed conductor is positioned between said carbon dioxide-selective adsorbent and said mixed conductor.
Claim 20
Dependent Claim
20 words
The process of claim 1, carried out at a temperature in the range of about 600 to about 1200° C.
Claim 21
Dependent Claim
49 words
The process of claim 1, wherein step (a) is carried out at an absolute pressure in the range of about 1 to 20 bara and step (b) is carried out by reducing the pressure in said at least one adsorption zone to about 10 -2 to about 1 bara.
Claim 22
Dependent Claim
20 words
The process of claim 1, carried out at a temperature in the range of about 750 to about 1100° C.
Claim 23
Dependent Claim
25 words
The process of claim 1, wherein step (b) is carried out by reducing the pressure in said at least one adsorption zone to subatmospheric pressure.
Claim 24
Dependent Claim
22 words
The process of claim 1, further comprising, during step (b), purging said at least one adsorption zone with a substantially oxygen-free gas.
Claim 25
Dependent Claim
20 words
The process of claim 23, wherein said substantially oxygen-free gas is steam, carbon dioxide, nitrogen, argon, helium or mixtures thereof.
Claim 26
Dependent Claim
11 words
The process of claim 1, wherein said gas 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) | 2003-05-09 | 2003-11-08 | 2004-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-09 | 2007-11-08 | 2008-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-09 | 2011-11-08 | 2012-05-09 | $7700.00 | Window Closed / Lapsed |