Patent US3795004A successfully refreshed from Google Patents.
Patent US3131156A successfully refreshed from Google Patents.
US3131156A
Expired / Lapsed
US
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Preparation of a silica-alumina cracking catalyst
Assignee: WR Grace and Co
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Filing: 1960-10-21
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Granted: 1964-04-28
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Expires: 1980-10-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles P Wilson
- 👤 Frank G Clapetta
- 👤 Jr James W Elston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:05
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR PREPARING A SILICA-ALUMINA HYDROCARBON CRACKING CATALYST WHICH COMPRISES PROVIDING AN ALKALI METAL SILICATE SOLUTION HAVING A SILICA TO ALKALI METAL OXIDE RATIO OF ABOUT 3:1 TO 3.4:1, CONTACTING SAID SILICATE SOLUTION WITH CARBON DIOXIDE IN AN AMOUNT SUFFICIENT TO CONVERT SUBSTANTIALLY ALL OF THE FREE ALKALI IN THE SILICATE TO ALKALI METAL CARBONATE AND FROM A SILICA HYDROGEL CONTAINING DISSOLVED CARBONATE, PREPARING A BASIC ALUMINUM SULFATE SOL BY ADJUSTING AN ALUMINUM SULFATE SOLUTION CONTAINING SUFFICIENT ALUMINA TO GIVE ABOUT 25% ACTIVE ALUMINA IN THE FINAL CATALYST TO A PH OF ABOUT 3.7 WITH CALCIUM CARBONATE, COMMINGLING THE SILICA HYDROGEL WITH SAID SOL THUS REACTING SUBSTANTIALLY COMPLETE WITH THE RESIDUAL SODIUM CARBONATE AND THEREBY PRECIPITATING THE BASIC ALUMINUM SULFATE AS ALUMINA AND PURIFYING AND DRYING THE RESULTING COMPOSITE.
Claim 2
Dependent Claim
130 words
A PROCESS FOR PREPARING A SILICA-ALUMINA HYDROCARBON CRACKING CATALYST WHICH COMPRISES PROVIDING AN ALKALI METAL SILICATE SOLUTION HAVING A SILICA TO ALKALI METAL OXIDE RATIO OF ABOUT 3:1 TO 3.4:1, CONTACTING SAID SILICATE SOLUTION WITH CARBON DIOXIDE IN AN AMOUNT SUFFICIENT TO CONVERT SUBSTANTIALLY ALL OF THE FREE ALKALI IN THE SILICATE TO ALKALI METAL CARBONATE AND FROM A SILICA HYDROGEL CONTAINING DISSOLVED CARBONATE, PREPARING A BASIC ALUMINUM SULFATE SOL BY ADJUSTING AN ALUMINUM SULFATE SOLUTION CONTAINING SUFFICIENT ALUMINA TO GIVE ABOUT 25% ACTIVE ALUMINA IN THE FINAL CATALYST TO A PH OF ABOUT 3.7 WITH CALCIUM CARBONATE, COMMINGLING THE SILICA HYDROGEL WITH SAID SOL THUS REACTING SUBSTANTIALLY COMPLETE WITH THE RESIDUAL SODIUM CARBONATE AND THEREBY PRECIPITATING THE BASIC ALUMINUM SULFATE AS ALUMINA AND PURIFYING AND DRYING THE RESULTING COMPOSITE.
References Cited (Backward Citations)
US2886512A
Cited
US3066092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |