US4529416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation kinetics in commercial pellets
Assignee: Air Products and Chemicals Inc
•
Filing: 1983-02-11
•
Granted: 1985-07-16
•
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
2026-10-30 21:04
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.
References Cited (Backward Citations)
US1844476A
Cited
US2487824A
Cited
US2472489A
Cited
US2671058A
Cited
US2882244A
Cited
US2944627A
Cited
US3164454A
Cited
US3202518A
Cited
GB979398A
Cited
US3436357A
Cited
US3242641A
Cited
US3280536A
Cited
US3619412A
Cited
US3551353A
Cited
US3564816A
Cited
US3597155A
Cited
US3641095A
Cited
US3636679A
Cited
US3738087A
Cited
US3796022A
Cited
US3901826A
Cited
US3923477A
Cited
US3957463A
Cited
US4013429A
Cited
US4137054A
Cited
US4147521A
Cited
US4264340A
Cited
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 |