Patent US2689229A successfully refreshed from Google Patents.
US2689229A
Expired / Lapsed
US
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Regeneration of ion-exchange materials
Assignee: Standard Oil Development Co
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Filing: 1951-12-04
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Granted: 1954-09-14
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Expires: 1971-12-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles N Kimberlin
- 👤 Elroy M Gladrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:51
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/142; C01B33/143; C01B33/1435; B; B01; B01J; B01J49/00; B01J49/50; B01J49/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF REGENERATING A CATION EXCHANGE RESIN FOLLOWING AN EXCHANGE CYCLE WHEREIN SILICA HYDROSOL WAS PRODUCED FROM AN ALKALI METAL SILICATE SOLUTION IN AN EXCHANGE CYCLE, WHICH COMPRISES TREATING THE USED EXCHANGE RESIN CONTAINING EXCHANGEABLE ALKALI METAL IONS WITH BOTH SULFURIC ACID AND SULFOROUS ACID, THE TOTAL AMOUNT OF ACID BEING SUCH AS TO SUBSTANTIALLY COMPLETELY REGENERATE THE RESIN, THE SULFURIC ACID BEING USED IN AN AMOUNT SUBSTANTIALLY CHEMICALLY EQUIVALENT TO THE ALKALI METAL IONS, THE SULFUROUS ACID, CALCULATED AS A MONOBASIC ACID, BEING USED IN AN AMOUNT SUFFICIENT TO SUBSTANTIALLY COMPLETE THE REGENERATION OF THE RESIN, PASSING THE RESULTING SOLUTION CONTAINING BISULFITE IONS TO A DISTILLATION ZONE TO REMOVE AND RECOVER SUBSTANTIALLY THE TOTAL BISULFITE CONTENT OF THE SOLUTION.
Claim 2
Independent Claim
121 words
A METHOD OF REGENERATING A CATION EXCHANGE RESIN FOLLOWING AN EXCHANGE CYCLE WHEREIN SILICA HYDROSOL WAS PRODUCED FROM AN ALKALI METAL SILICATE SOLUTION IN AN EXCHANGE CYCLE, WHICH COMPRISES TREATING THE USED EXCHANGE RESIN CONTAINING EXCHANGEABLE ALKALI METAL IONS WITH BOTH SULFURIC ACID AND SULFOROUS ACID, THE TOTAL AMOUNT OF ACID BEING SUCH AS TO SUBSTANTIALLY COMPLETELY REGENERATE THE RESIN, THE SULFURIC ACID BEING USED IN AN AMOUNT SUBSTANTIALLY CHEMICALLY EQUIVALENT TO THE ALKALI METAL IONS, THE SULFUROUS ACID, CALCULATED AS A MONOBASIC ACID, BEING USED IN AN AMOUNT SUFFICIENT TO SUBSTANTIALLY COMPLETE THE REGENERATION OF THE RESIN, PASSING THE RESULTING SOLUTION CONTAINING BISULFITE IONS TO A DISTILLATION ZONE TO REMOVE AND RECOVER SUBSTANTIALLY THE TOTAL BISULFITE CONTENT OF THE SOLUTION.
References Cited (Backward Citations)
US2564820A
Cited
US2366651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |