US2777822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica-alumina cracking catalyst production
Assignee: WR Grace and Co
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Filing: 1953-04-27
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Granted: 1957-01-15
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles P Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:32
CPC Classifications
B; B01; B01J; B01J21/00; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR PORDUCING A SILICA-ALUMINA HYDROCARBON CRACKING CATALYST COMPRISING THE STEPS OF COMMINGLING SULFURIC ACID WITH SODIUM SILICATE SOLUTION TO FORM A SILICA HYDROGEL IN AQUEOUS SLURRY AT A PH OF BETWEEN 9.5 ANBD 10.5, AGING SAID HYDROGEL IN SAID SLURRY, COMMINGLING THE RESULTING HYDROGEL SLURRY WITH AN ADDITIONAL QUANTITY OF SULFURIC ACID TO REDUCE THE PH TO ABOUT 7.0, COMMINGLING THEREWITH AN AMOUNT OF ALUMINUM SULFATE SOLUTION SUFFICIENT TO PRODUCE THE FINAL PRODUCT HAVING TH EDESIRED ALUMINA TO SILICA RATIO, SAID ALUM SOLUTION CONTAINING ABOUT 11/2% TO 21/2% OF SULFURIC ACID, ADDING TO THE RESULTING MIXTURE SUFFICIENT AMMONIA TO PRECIPITATE THE ALUMINA AND FILTERING WASHING, AND DRYING THE RESULTING PRODUCT.
Claim 2
Dependent Claim
112 words
A PROCESS FOR PORDUCING A SILICA-ALUMINA HYDROCARBON CRACKING CATALYST COMPRISING THE STEPS OF COMMINGLING SULFURIC ACID WITH SODIUM SILICATE SOLUTION TO FORM A SILICA HYDROGEL IN AQUEOUS SLURRY AT A PH OF BETWEEN 9.5 ANBD 10.5, AGING SAID HYDROGEL IN SAID SLURRY, COMMINGLING THE RESULTING HYDROGEL SLURRY WITH AN ADDITIONAL QUANTITY OF SULFURIC ACID TO REDUCE THE PH TO ABOUT 7.0, COMMINGLING THEREWITH AN AMOUNT OF ALUMINUM SULFATE SOLUTION SUFFICIENT TO PRODUCE THE FINAL PRODUCT HAVING TH EDESIRED ALUMINA TO SILICA RATIO, SAID ALUM SOLUTION CONTAINING ABOUT 11/2% TO 21/2% OF SULFURIC ACID, ADDING TO THE RESULTING MIXTURE SUFFICIENT AMMONIA TO PRECIPITATE THE ALUMINA AND FILTERING WASHING, AND DRYING THE RESULTING PRODUCT.
References Cited (Backward Citations)
US2462236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |