US2905534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of synthetic alumina catalyst bases
Assignee: ChampionX LLC
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Filing: 1955-10-13
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Granted: 1959-09-22
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Expires: 1975-10-13
Abstract
No abstract record available.
Inventors
- 👤 David G Braithwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:43
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; Y; Y10; Y10S; Y10S48/00; Y10S48/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A METHOD OF TREATING AN IMPURE ALUMINA CATALYST BASE TO REMOVE METALLIC CATION AND INORGANIC ANION CONTAMINANTS SAID CATION CONTAMINANT INCLUCING SODIUM IONS PRESENT IN AN AMOUNT SUBSTANTIALLY GREATER THAN 0.05% AND SAID ANION CONTAMINANT INCLUDING SULFATE IONS PRESENT IN AN AMOUNT GREATER THAN 0.5% COMPRISING SUSPENDING THE ALUMINA BASE IN AN AQUEOUS SOLUTION CONTAINING AN ALKALI METAL CARBONATE IN SUFFICIENT AMOUNT TO PRODUCE A PH OF ABOUT 8 TO ABOUT 14 IN THE RESULTING SLURRY, ADDING SUFFICIENT ACID TO THE SLURRY TO OBTAIN A PH OF ABOUT 7 TO ABOUT 8, SEPARATING OUT THE ALUMINA BASE SLURRY AND WASHING SAID BASE WITH NEUTRAL WATER UNTIL THE QUANTITY OF SAID SODIUM IONS IN SAID ALUMINA CATALYST IS REDUCED BELOW 0.05%, EXPRESSED AS NA2O, AND UNTIL THE QUANTITY OF SAID SULFATE IONS IN SAID CATALYST IS REDUCED BELOW 0.5%
Claim 2
Independent Claim
138 words
A METHOD OF TREATING AN IMPURE ALUMINA CATALYST BASE TO REMOVE METALLIC CATION AND INORGANIC ANION CONTAMINANTS SAID CATION CONTAMINANT INCLUCING SODIUM IONS PRESENT IN AN AMOUNT SUBSTANTIALLY GREATER THAN 0.05% AND SAID ANION CONTAMINANT INCLUDING SULFATE IONS PRESENT IN AN AMOUNT GREATER THAN 0.5% COMPRISING SUSPENDING THE ALUMINA BASE IN AN AQUEOUS SOLUTION CONTAINING AN ALKALI METAL CARBONATE IN SUFFICIENT AMOUNT TO PRODUCE A PH OF ABOUT 8 TO ABOUT 14 IN THE RESULTING SLURRY, ADDING SUFFICIENT ACID TO THE SLURRY TO OBTAIN A PH OF ABOUT 7 TO ABOUT 8, SEPARATING OUT THE ALUMINA BASE SLURRY AND WASHING SAID BASE WITH NEUTRAL WATER UNTIL THE QUANTITY OF SAID SODIUM IONS IN SAID ALUMINA CATALYST IS REDUCED BELOW 0.05%, EXPRESSED AS NA2O, AND UNTIL THE QUANTITY OF SAID SULFATE IONS IN SAID CATALYST IS REDUCED BELOW 0.5%
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |