US4387085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high surface area alumina
Assignee: Honeywell International Inc
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Filing: 1981-11-25
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Granted: 1983-06-07
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Expires: 2001-11-25
Abstract
Abstract A high surface area alumina is prepared by heating a solution of an aluminum trialkoxide in a secondary or tertiary alcohol solvent to a sub-critical temperature at which the solvent decomposes to form water, and the water so formed hydrolyzes the aluminum trialkoxide. Solutions include aluminum tri-s-butoxide in s-butanol. The resultant aluminas have surface areas 500 m2/g or greater.
Inventors
- 👤 Anthony J. Fanelli
- 👤 Arthur T. Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:21
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01P; C01P2006/00; C01P2006/10; C01P2006/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A process for preparing a high surface area alumina which comprises the steps: (a) dissolving an aluminum trialkoxide in a secondary or tertiary alcohol solvent to form a water-free solution, (b) heating the water-free solution to a first temperature at which the solvent decomposes to form an alkene or ether and water, and the water so formed hydrolyzes the aluminum trialkoxide to form alumina and alkanol; said first temperature being below the critical temperature of said solvent; (c) cooling the solution to a temperature at which the decomposition of solvent stops; and (d) recovering the alumina as a dry material of surface area at least about 500 m 2 /g.
Claim 2
Dependent Claim
110 words
A process for preparing a high surface area alumina which comprises the steps: (a) dissolving an aluminum trialkoxide in a secondary or tertiary alcohol solvent to form a water-free solution, (b) heating the water-free solution to a first temperature at which the solvent decomposes to form an alkene or ether and water, and the water so formed hydrolyzes the aluminum trialkoxide to form alumina and alkanol; said first temperature being below the critical temperature of said solvent; (c) cooling the solution to a temperature at which the decomposition of solvent stops; and (d) recovering the alumina as a dry material of surface area at least about 500 m 2 /g.
Claim 3
Dependent Claim
43 words
The process of claim 1 wherein said aluminum tri-alkoxide is of the formula Al(OR) 3 wherein R is s-alkyl of 3-6 carbons and said solvent is a secondary alcohol of 3-6 carbons, said alkanol formed in said step (b) corresponding to said solvent.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein said aluminum trialkoxide is aluminum tri-s-butoxide and said solvent is s-butanol.
Claim 5
Dependent Claim
22 words
The process of claim 1 or 2 or 3 wherein said first temperature is between about 200° C. and about 300° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |