US3839230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the active-alumina catalyst properties
Assignee: PETROCHIM INST DE CERCETARI PE
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Filing: 1972-03-06
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Granted: 1974-10-01
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Expires: 1992-03-06
Abstract
Abstract A process for producing active aluminum with a surface area in the range of 50-200 m2/g wherein performed alumina gel bodies are shaped and dried and the shaped dried bodies are autoclaved at a temperature of more than 100* C in contact with vapors of an aqueous ammonia solution containing 0.5 to 20 percent by weight NH3 for a period of 2 to 12 hours. The resulting hydrated aluminum, with a molar ratio of water of crystallization to Al2O3 of less than 1.4, is thereafter calcined in air.
Inventors
- 👤 A Cobzaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:15
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J37/00; B01J37/0009; C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C01P; C01P2006/00; C01P2006/12; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/503
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
96 words
A PROCESS FOR PRODUCING ACTIVE ALUMINA WHICH COMPRISES THE STEPS OF: FORMING BODIES OF ALUMINA GEL BY SHAPING SAID ALUMINA GEL AND DRYING THE SHAPED BODIES; AUTOCLAVING THE DRIED SHAPED BODIES IN CONTACT WITH THE STEAM AND AMMONIA OF AND OUT OF CONTACT WITH THE LIQUID WITH STEAM AND AMMONIA AMMONIA SOLUTION CONTAINING 0.5-20 PERCENT BY WEIGHT NH3 AT A TEMPERATURE OF SUBSTANTIALLY 150* TO 250*C FOR A PERIOD OF 2 TO 12 HOURS; AND THEREAFTER CALCINING THE AUTOCLAVED BODIES IN AIR, THE RESULTING ACTIVE ALUMINA HAVING A SURFACE AREA OF SUBSTANTIALLY 50 TO 200 M2/G.
Claim 2
Dependent Claim
96 words
A PROCESS FOR PRODUCING ACTIVE ALUMINA WHICH COMPRISES THE STEPS OF: FORMING BODIES OF ALUMINA GEL BY SHAPING SAID ALUMINA GEL AND DRYING THE SHAPED BODIES; AUTOCLAVING THE DRIED SHAPED BODIES IN CONTACT WITH THE STEAM AND AMMONIA OF AND OUT OF CONTACT WITH THE LIQUID WITH STEAM AND AMMONIA AMMONIA SOLUTION CONTAINING 0.5-20 PERCENT BY WEIGHT NH3 AT A TEMPERATURE OF SUBSTANTIALLY 150* TO 250*C FOR A PERIOD OF 2 TO 12 HOURS; AND THEREAFTER CALCINING THE AUTOCLAVED BODIES IN AIR, THE RESULTING ACTIVE ALUMINA HAVING A SURFACE AREA OF SUBSTANTIALLY 50 TO 200 M2/G.
Claim 3
Dependent Claim
9 words
The product made by the process of claim 1.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |