Patent US2662860A successfully refreshed from Google Patents.
US2662860A
Expired / Lapsed
US
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Method for the production of molded alumina carrier and catalyst
Assignee: Shell Development Co
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Filing: 1950-11-28
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Granted: 1953-12-15
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Expires: 1970-11-28
Abstract
No abstract record available.
Inventors
- 👤 Engel Willem Frederik
- 👤 Krijger Pieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/882; A; A41; A41F; A41F11/00; A41F11/16; B01J21/00; B01J21/02; B01J21/04; B01J21/16; B01J37/00; B01J37/0009; B01J37/04; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0434
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
METHOD FOR PREPARING ALUMINUM OXIDE MOLDED PARTICLES PARTICULARLY SUITED FOR USE IN CATALYSIS WHICH COMPRISES IN COMBINATION THE STEPS OF GRINDING ALUMINA TRIHYDRATE TO A POWDER OF A GRAIN SIZE LESS THAN 0.5 MM. SUCH THAT AT LEAST 5% BY WEIGHT IS OF PARTICLE SIZE LARGER THAN 210 MICRONS AND FROM 30 TO 60% BY WEIGHT IS SMALLER THAN 74 MICRONS, MIXING THE RESULTANT POWDER OF ALUMINA TRIHYDRATE WITH BETWEEN 1% AND ABOUT 6% OF A WATER SOLUBLE SALT OF ALUMINUM AND A STRONG ACID AND SUFFICIENT WATER BETWEEN 12 AND 20% BY WEIGHT BASED ON THE HYDRATED ALUMINA TO FORM A PASTE, EXTRUDING SAID PASTE INTO FORMED PELLETS, DRYING SAID PELLETS AND CALCINING THEM AT A TEMPERATURE OF 200-300* C. UNTIL BOUND HYDRATE WATER SUBSTANTIALLY CEASES TO BE SET FREE AND THEN AT A TEMPERATURE BETWEEN 400 AND 800* C. TO OBTAIN GAMMA ALUMINA.
Claim 2
Dependent Claim
145 words
METHOD FOR PREPARING ALUMINUM OXIDE MOLDED PARTICLES PARTICULARLY SUITED FOR USE IN CATALYSIS WHICH COMPRISES IN COMBINATION THE STEPS OF GRINDING ALUMINA TRIHYDRATE TO A POWDER OF A GRAIN SIZE LESS THAN 0.5 MM. SUCH THAT AT LEAST 5% BY WEIGHT IS OF PARTICLE SIZE LARGER THAN 210 MICRONS AND FROM 30 TO 60% BY WEIGHT IS SMALLER THAN 74 MICRONS, MIXING THE RESULTANT POWDER OF ALUMINA TRIHYDRATE WITH BETWEEN 1% AND ABOUT 6% OF A WATER SOLUBLE SALT OF ALUMINUM AND A STRONG ACID AND SUFFICIENT WATER BETWEEN 12 AND 20% BY WEIGHT BASED ON THE HYDRATED ALUMINA TO FORM A PASTE, EXTRUDING SAID PASTE INTO FORMED PELLETS, DRYING SAID PELLETS AND CALCINING THEM AT A TEMPERATURE OF 200-300* C. UNTIL BOUND HYDRATE WATER SUBSTANTIALLY CEASES TO BE SET FREE AND THEN AT A TEMPERATURE BETWEEN 400 AND 800* C. TO OBTAIN GAMMA ALUMINA.
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) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |