Patent US4529416A successfully refreshed from Google Patents.
US4529416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation kinetics in commercial pellets
Assignee: Air Products and Chemicals Inc
•
Filing: 1983-02-11
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Granted: 1985-07-16
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Expires: 2003-02-11
Abstract
Abstract To improve the column dynamics of commercial pelleted sodium aluminosilicate zeolite adsorbents used in gas separation, the pellets are treated by washing in dilute aqueous mineral acid. The treatment is most effective as applied to sodium mordenite pellets, employing hydrochloric acid of about 0.1 normality.
Inventors
- 👤 Shivaji Sircar
- 👤 William J. Ambs
- 👤 Roger R. Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:21
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0462; B01D53/047; B01J20/186; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D53/0407; B01D53/0423; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
The method of improving the dynamic adsorption properties of pelletized sodium aluminosilicate zeolites used in gas separation processes by removing binder material and unreacted aluminosilicate materials formed on the zeolite during pellet formation, which comprises treating such pellets with a mild wash of dilute aqueous monoprotic mineral acid at an acid concentration not in excess of 0.3 normality.
Claim 2
Independent Claim
58 words
The method of improving the dynamic adsorption properties of pelletized sodium aluminosilicate zeolites used in gas separation processes by removing binder material and unreacted aluminosilicate materials formed on the zeolite during pellet formation, which comprises treating such pellets with a mild wash of dilute aqueous monoprotic mineral acid at an acid concentration not in excess of 0.3 normality.
Claim 3
Dependent Claim
16 words
The method as defined in claim 1 wherein said acid is HCl of about 0.1 normality.
Claim 4
Dependent Claim
18 words
The method as defined in claim 2 wherein such treating is carried out by successively applied acid dosages.
Claim 5
Dependent Claim
22 words
The method as defined in claim 2 wherein said acid is applied at a dosage of 0.5-3 liters per pound of adsorbent.
Claim 6
Dependent Claim
16 words
The method as defined in claim 2 wherein said pelleted zeolite consists essentially of sodium mordenite.
Claim 7
Dependent Claim
16 words
The method as defined in claim 1 wherein said pelleted zeolite consists essentially of sodium mordenite.
Claim 8
Dependent Claim
13 words
The method as defined in claim 1 wherein said pelleted zeolite is 13X.
Claim 9
Dependent Claim
89 words
In methods of gas separation by selective pressure swing adsorption or thermal swing adsorption of a component of a mixed gas stream, the improvement which comprises passing such mixed gas stream through a sorbent bed comprising pelletized sodium aluminosilicate zeolite adsorbent which has been subjected to a mild wash in dilute aqueous monoprotic mineral acid at a concentration not in excess of 0.3 normal to remove binder material and unreacted aluminosilicate materials formed on the zeolite adsorbent during pellet formation to improve the dynamic adsorption properties of the adsorbent.
Claim 10
Dependent Claim
89 words
In methods of gas separation by selective pressure swing adsorption or thermal swing adsorption of a component of a mixed gas stream, the improvement which comprises passing such mixed gas stream through a sorbent bed comprising pelletized sodium aluminosilicate zeolite adsorbent which has been subjected to a mild wash in dilute aqueous monoprotic mineral acid at a concentration not in excess of 0.3 normal to remove binder material and unreacted aluminosilicate materials formed on the zeolite adsorbent during pellet formation to improve the dynamic adsorption properties of the adsorbent.
Claim 11
Dependent Claim
16 words
The improvement as defined in claim 8 wherein said zeolite adsorbent consists essentially of sodium mordenite.
Claim 12
Dependent Claim
16 words
The improvement as defined in claim 9 wherein said mixed gas stream comprises oxygen and nitrogen.
Claim 13
Dependent Claim
20 words
The improvement as defined in claim 8 wherein said aqueous acid is hydrochloric at a concentration of about 0.1 normal.
Claim 14
Dependent Claim
35 words
The improvement as defined in claim 8 wherein said zeolite adsorbent is one that has been washed in aqueous hydrochloric acid at a dosage of 0.5-3 liters of such acid per pound of the adsorbent.
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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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |