US4557736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary ion exchanged type X zeolite adsorbent
Assignee: Air Products and Chemicals Inc
•
Filing: 1984-10-29
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Granted: 1985-12-10
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Expires: 2004-10-29
Abstract
Abstract The present invention involves an improved adsorbent for gas separation processes. The adsorbent comprises a binary ion exchanged Type X zeolite wherein between 5% and 40% of the available ion sites are occupied by Ca, and between 60% and 95% of the available ion sites are occupied by Sr. The present adsorbent is especially useful for the adsorption of N 2 from an air stream at superambient pressure to produce an O 2 -rich product stream.
Inventors
- 👤 Shivaji Sircar
- 👤 Roger R. Conrad
- 👤 William J. Ambs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2256/00; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/102; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40088; B01D2259/4009
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A binary ion exchanged Type X zeolite adsorbent wherein between 5% and 40% of the available ion sites are occupied by Ca and between 60% and 95% of the available ion sites are occupied by Sr.
Claim 2
Dependent Claim
36 words
A binary ion exchanged Type X zeolite adsorbent wherein between 5% and 40% of the available ion sites are occupied by Ca and between 60% and 95% of the available ion sites are occupied by Sr.
Claim 3
Dependent Claim
27 words
A binary ion exchanged Type X zeolite adsorbent in accordance with claim 1 wherein between 8% and 12% of the available ion sites are occupied by Ca.
Claim 4
Dependent Claim
27 words
A binary ion exchanged Type X zeolite adsorbent in accordance with claim 2 wherein between 88% and 92% of the available ion sites are occupied by Sr.
Claim 5
Dependent Claim
23 words
A binary ion exchanged Type X zeolite adsorbent in accordance with claim 1 wherein 0-5% of the ion sites are occupied by Na.
Claim 6
Dependent Claim
71 words
A process for producing an oxygen-enriched stream from a gas stream comprising nitrogen and oxygen, said process comprising: contacting said gas stream with a binary ion exchanged Type X zeolite adsorbent so as to adsorb a portion of the nitrogen present in said gas stream wherein between 5% and 40% of the available ion sites on the adsorbent are occupied by Ca and between 60% and 95% are occupied by Sr.
Claim 7
Dependent Claim
71 words
A process for producing an oxygen-enriched stream from a gas stream comprising nitrogen and oxygen, said process comprising: contacting said gas stream with a binary ion exchanged Type X zeolite adsorbent so as to adsorb a portion of the nitrogen present in said gas stream wherein between 5% and 40% of the available ion sites on the adsorbent are occupied by Ca and between 60% and 95% are occupied by Sr.
Claim 8
Dependent Claim
36 words
A process in accordance with claim 5 wherein said gas stream is contacted with a binary ion exchanged Type X zeolite adsorbent wherein between 8% and 12% of the available ion sites are occupied by Ca.
Claim 9
Dependent Claim
36 words
A process in accordance with claim 6 wherein said gas stream is contacted with a binary ion exchanged Type X zeolite adsorbent wherein between 88% and 92% of the available ion sites are occupied by Sr.
Claim 10
Dependent Claim
30 words
The process in accordance with claim 5 wherein the adsorbent bed is subsequently depressurized and purged with an oxygen-rich stream to regenerate the adsorbent bed and produce a nitrogen-rich stream.
Claim 11
Dependent Claim
112 words
A process for removing nitrogen from a gas stream comprising nitrogen and oxygen, said process comprising: a. establishing and maintaining said gas stream at a temperature between 0° and 50° C. and at a pressure between 1 atm and 5 atm; and b. passing said feed gas over an adsorbent bed comprising a binary ion exchanged Type X zeolite wherein between 5% and 40% of the available ion sites are occupied by Ca, and between 60% and 95% of the available ion sites are occupied by Sr, such that at least a portion of the nitrogen in said gas stream is adsorbed by the adsorbent bed, thereby leaving an oxygen-rich product stream.
Claim 12
Dependent Claim
112 words
A process for removing nitrogen from a gas stream comprising nitrogen and oxygen, said process comprising: a. establishing and maintaining said gas stream at a temperature between 0° and 50° C. and at a pressure between 1 atm and 5 atm; and b. passing said feed gas over an adsorbent bed comprising a binary ion exchanged Type X zeolite wherein between 5% and 40% of the available ion sites are occupied by Ca, and between 60% and 95% of the available ion sites are occupied by Sr, such that at least a portion of the nitrogen in said gas stream is adsorbed by the adsorbent bed, thereby leaving an oxygen-rich product stream.
Claim 13
Dependent Claim
22 words
The process in accordance with claim 9 wherein said adsorbent bed is initially pressurized to about 3.7 atm with an oxygen-enriched gas.
Claim 14
Dependent Claim
32 words
The process in accordance with claim 10 wherein said adsorbent bed is depressurized and subsequently back-purged with an oxygen-rich gas stream to remove part of the nitrogen, thereby regenerating the adsorbent bed.
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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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |