US2688003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of spheroidal silica alumina catalyst
Assignee: Shell Development Co
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Filing: 1951-05-14
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Granted: 1954-08-31
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Expires: 1971-05-14
Abstract
No abstract record available.
Inventors
- 👤 Lloyd B Ryland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:27
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/03; B01J37/036; B01J21/00; B01J21/12; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
THE METHOD FOR THE PRODUCTION OF MICROSPHEROIDAL SILICA-ALUMINA GEL CATALYST WHICH COMPRISES DISPERSING MICROSPHEROIDAL PARTICLES OF PARTIALLY HYDRATED SODIUM SILICATE HAVING A RATIO OF SIO2/NA2O BETWEEN 1.6 AND 4.2 AND A WATER CONTENT BETWEEN ABOUT 8% AND ABOUT 19% IN AN AGITATED COLD SOLUTION OF AT LEAST A 0.05 MOLAR CONCENTRATION OF AN ALUMIUM SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF H2SO4, HC1, AND HNO3, SAID SOLUTION AMOUNTING TO AT LEAST 10 LITRES PER KILOGRAM OF SAID SODIUM SILICATE AND CONTAINING AT LEAST 125% OF THE STOICHIOMETRIC AMOUNT OF AL+++ EQUIVALENT TO THE NA+ CONTENT OF SAID SODIUM SILICATE, RETAINING THE PARTICLES OF SODIUM SILICATE IN SAID SOLUTION UNTIL THE REACTION IS SUBSTANTIALLY COMPLETE, SEPARATING THE RESULTING MICROSPHERIODAL GEL PARTICLES FROM THE SAID SOLUTION AND WASHING, DRYING, AND CALCINING THE SEPARATED PARTICLES.
Claim 2
Independent Claim
135 words
THE METHOD FOR THE PRODUCTION OF MICROSPHEROIDAL SILICA-ALUMINA GEL CATALYST WHICH COMPRISES DISPERSING MICROSPHEROIDAL PARTICLES OF PARTIALLY HYDRATED SODIUM SILICATE HAVING A RATIO OF SIO2/NA2O BETWEEN 1.6 AND 4.2 AND A WATER CONTENT BETWEEN ABOUT 8% AND ABOUT 19% IN AN AGITATED COLD SOLUTION OF AT LEAST A 0.05 MOLAR CONCENTRATION OF AN ALUMIUM SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF H2SO4, HC1, AND HNO3, SAID SOLUTION AMOUNTING TO AT LEAST 10 LITRES PER KILOGRAM OF SAID SODIUM SILICATE AND CONTAINING AT LEAST 125% OF THE STOICHIOMETRIC AMOUNT OF AL+++ EQUIVALENT TO THE NA+ CONTENT OF SAID SODIUM SILICATE, RETAINING THE PARTICLES OF SODIUM SILICATE IN SAID SOLUTION UNTIL THE REACTION IS SUBSTANTIALLY COMPLETE, SEPARATING THE RESULTING MICROSPHERIODAL GEL PARTICLES FROM THE SAID SOLUTION AND WASHING, DRYING, AND CALCINING THE SEPARATED PARTICLES.
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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |