US3981979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a pure high surface area alumina
Assignee: CROSFIELD CHEMICALS COMPANY A DIVISION OF INDOPCO Inc A CORP OF DELAWARE
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Filing: 1975-06-06
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Granted: 1976-09-21
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Expires: 1995-06-06
Abstract
Abstract Pure, high surface area alumina is produced by the reaction of aluminum salts with lower aliphatic epoxides in an aqueous media and is washed with aqueous solutions of ammonia which have a pH of at least 7.
Inventors
- 👤 David G. Braithwaite
- 👤 Virgil L. Seale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:35
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/46; C01P; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A process for producing a pure, high surface area alumina which comprises reacting in an aqueous media an acidic aluminum salt from the group consisting of aluminum chloride and aluminum sulfate, with a lower aliphatic epoxide from the group consisting of ethylene oxide, 1,2-propylene oxide and epichlorohydrin, to form an alumina gel, washing said gel with an aqueous solution of ammonia which has a pH of at least 7, said gel being characterized as porous and filterable, separating said aqueous solution of ammonia from said gel, and then recovering the purified alumina as a product of the process.
Claim 2
Dependent Claim
98 words
A process for producing a pure, high surface area alumina which comprises reacting in an aqueous media an acidic aluminum salt from the group consisting of aluminum chloride and aluminum sulfate, with a lower aliphatic epoxide from the group consisting of ethylene oxide, 1,2-propylene oxide and epichlorohydrin, to form an alumina gel, washing said gel with an aqueous solution of ammonia which has a pH of at least 7, said gel being characterized as porous and filterable, separating said aqueous solution of ammonia from said gel, and then recovering the purified alumina as a product of the process.
Claim 3
Dependent Claim
35 words
The process of claim 1 where the lower aliphatic epoxide is ethylene oxide, the acidic aluminum salt is aluminum chloride and the pH of the ammonia solution is within the range of 7.5 to 10.5.
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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |