US4747854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective chromatographic process using an ion-exchanged, dehydrated chabazite adsorbent
Assignee: Air Products and Chemicals Inc
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Filing: 1987-06-25
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Granted: 1988-05-31
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Expires: 2007-06-25
Abstract
Abstract The present invention relates to a process for the selective adsorption and separation of one or more constituents from a gas stream in a gas chromatograph, wherein the gas stream is contacted with a dehydrated chabazite adsorbent having a residual water content of less than 1.5 wt % and having at least 50% of any exchangeable ion capacity exchanged with a polyvalent metal cation. The process of the present invention both anticipates separation of the constituents due to either a difference in the heats of adsorption of the constituents or a size exclusion effect.
Inventors
- 👤 Peter J. Maroulis
- 👤 Charles G. Coe
- 👤 Steven M. Kuznicki
- 👤 David A. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:03
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
In a process for the selective adsorption and separation of one or more constituents from a gas stream, wherein the gas stream is contacted with a zeolitic adsorbent contained within a column maintained within a gas chromatograph while having an inert carrier gas continually flowing through the column, the improvement for the selective adsorption and separation of the constituents comprises utilizing a dehydrated chabazite adsorbent having a residual water content of less than 1.5 wt% as the zeolite adsorbent, wherein the dehydrated chabazite has at least 50% of any exchangeable ion capacity exchanged with a polyvalent metal cation.
Claim 2
Dependent Claim
98 words
In a process for the selective adsorption and separation of one or more constituents from a gas stream, wherein the gas stream is contacted with a zeolitic adsorbent contained within a column maintained within a gas chromatograph while having an inert carrier gas continually flowing through the column, the improvement for the selective adsorption and separation of the constituents comprises utilizing a dehydrated chabazite adsorbent having a residual water content of less than 1.5 wt% as the zeolite adsorbent, wherein the dehydrated chabazite has at least 50% of any exchangeable ion capacity exchanged with a polyvalent metal cation.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the polyvalent metal cation is a divalent metal.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the polyvalent metal cation is an alkaline earth metal.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the polyvalent metal cation is calcium.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein two of the constituents which are separated from each other are argon and oxygen.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein argon and oxygen are present in the gas stream in trace amounts.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |