US4925460A
Expired / Lapsed
US
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Chabazite for gas separation
Assignee: Air Products and Chemicals Inc
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Filing: 1989-07-20
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Granted: 1990-05-15
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Expires: 2009-07-20
Abstract
Abstract An improved adsorbent for gas separation comprising a lithium exchanged chabazite having a Si/Al ratio between 2.1 and 2.8 wherein at least 65% of the exchangeable ion capacity is in the lithium form.
Inventors
- 👤 Charles G. Coe
- 👤 Thomas R. Gaffney
- 👤 Rajagopalan S. Srinivasan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:26
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2253/1085; B01D2256/00; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/102; B01D2257/108; B01D2257/11; B01D53/04; B01D53/047; B01D53/0476
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
78 words
A process for separating a gas mixture comprising a first component and a second component wherein said first component has a higher heat of adsorption than the second component, said process comprising bringing said gas mixture into contact with lithium exchanged chabazite having a Si/Al ratio from about 2.1 to 2.8 wherein at least 65% of the exchangeable ion capacity is in the lithium form, such that said chabazite selectively adsorbs the first component from the gas mixture.
Claim 2
Dependent Claim
78 words
A process for separating a gas mixture comprising a first component and a second component wherein said first component has a higher heat of adsorption than the second component, said process comprising bringing said gas mixture into contact with lithium exchanged chabazite having a Si/Al ratio from about 2.1 to 2.8 wherein at least 65% of the exchangeable ion capacity is in the lithium form, such that said chabazite selectively adsorbs the first component from the gas mixture.
Claim 3
Dependent Claim
13 words
A process in accordance with claim 1 wherein nitrogen is the first component.
Claim 4
Dependent Claim
34 words
A process in accordance with claim 1 wherein said gas mixture contains nitrogen as the first component and oxygen as the second component and said chabazite selectively adsorbs nitrogen to produce an oxygen-concentrated stream.
Claim 5
Dependent Claim
13 words
A process in accordance with claim 1 wherein said gas mixture is air.
Claim 6
Dependent Claim
27 words
A process in accordance with claim 1 wherein said gas mixture is brought into contact with the chabazite adsorbent in an O 2 pressure swing adsorption process.
Claim 7
Dependent Claim
22 words
A process in accordance with claim 5 which is carried out within a pressure range from about 1 atm to 15 atm.
Claim 8
Dependent Claim
27 words
A process in accordance with claim 1 wherein said gas mixture is brought into contact with the chabazite adsorbent in an O 2 vacuum swing adsorption process.
Claim 9
Dependent Claim
29 words
A process in accordance with claim 7 wherein said gas mixture is brought into contact with said chabazite adsorbent within a pressure range from about 0 to 3 atm.
Claim 10
Dependent Claim
28 words
A process in accordance with claim 1 wherein said gas mixture is brought into contact with the chabazite adsorbent in a vacuum swing adsorption process to produce nitrogen.
Claim 11
Dependent Claim
28 words
A process in accordance with claim 1 wherein said gas mixture is brought into contact with said chabazite adsorbent at a temperature from about 15° to 70° C.
Claim 12
Dependent Claim
38 words
A process in accordance with claim 1 wherein nitrogen is selectively adsorbed from a gas mixture comprising nitrogen and a component selected from the group consisting of Ar, H 2 , He, Kr, Ne, Xe and mixtures thereof.
Claim 13
Dependent Claim
28 words
A process in accordance with claim 1 wherein CH 4 is selectively adsorbed from a gas mixture comprising CH 4 and H 2 , He or mixtures thereof.
Claim 14
Dependent Claim
21 words
A process in accordance with claim 1 which is carried out within a pressure range from about 0 to 15 atm.
Claim 15
Dependent Claim
43 words
An adsorbent for selectively adsorbing nitrogen from a gas mixture containing nitrogen and oxygen, said adsorbent comprising lithium exchanged chabazite having a Si/Al ratio from about 2.1 and 2.8 wherein at least 65% of the exchangeable ion capacity is in the lithium form.
Claim 16
Dependent Claim
43 words
An adsorbent for selectively adsorbing nitrogen from a gas mixture containing nitrogen and oxygen, said adsorbent comprising lithium exchanged chabazite having a Si/Al ratio from about 2.1 and 2.8 wherein at least 65% of the exchangeable ion capacity is in the lithium form.
Claim 17
Dependent Claim
52 words
A process for preparing a chabazite extrudate comprising: treating alumina bound zeolite Y extrudate having a total Si/Al ratio of about 1.2 with silica sol sufficient to give a mixture with Si/Al from 1.9 to 2.5 and subsequently heating the resultant mixture in the presence of KOH to produce a chabazite extrudate.
Claim 18
Dependent Claim
52 words
A process for preparing a chabazite extrudate comprising: treating alumina bound zeolite Y extrudate having a total Si/Al ratio of about 1.2 with silica sol sufficient to give a mixture with Si/Al from 1.9 to 2.5 and subsequently heating the resultant mixture in the presence of KOH to produce a chabazite extrudate.
Claim 19
Dependent Claim
20 words
A process in accordance with claim 15 wherein the resultant reactant mixture is heated in the presence of 6-12M KOH.
Claim 20
Dependent Claim
24 words
A process in accordance with claim 15 wherein the chabazite extrudate are ion exchanged into the lithium form by treatment with about 1M LiCl.
Claim 21
Dependent Claim
23 words
A process in accordance with claim 17 wherein said chabazite extrudate is ion exchanged with NaCl prior to being ion exchanged with LiCl.
Claim 22
Dependent Claim
28 words
A process in accordance with claim 17 wherein the chabazite extrudate ion exchanged into the lithium form is subsequently dehydrated by heating to a temperature from 250°-500° C.
Claim 23
Dependent Claim
37 words
A process in accordance with claim 17 wherein the resultant lithium exchanged chabazite extrudate has a Si/Al ratio from about 2.1 to 2.8 and at least 65% of the exchangeable ion capacity is in the lithium form.
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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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |