US4018881A
Expired / Lapsed
US
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High surface area alumina and method for the preparation thereof
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-01-15
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Granted: 1977-04-19
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Expires: 1995-01-15
Abstract
Abstract A high surface area alumina is provided exhibiting a surface area ranging from about 350 to about 550 meters2/gram.
Inventors
- 👤 William J. Mattox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:02
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J35/00; B01J35/60; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/78; B01J35/61; B01J35/615; B01J35/63; B01J35/635; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
Process for preparing high surface area aluminas comprising reacting substantially anhydrous aluminum chloride with ammonia at temperatures ranging from about 100° to about 900° F. to form an aluminum chloride-ammonia complex comprising aluminum chloride polyammoniates having a composition corresponding to 3-6 moles NH 3 /mole AlCl 3 , and hydrolyzing said polyammoniates to obtain high surface area alumina.
Claim 2
Dependent Claim
58 words
Process for preparing high surface area aluminas comprising reacting substantially anhydrous aluminum chloride with ammonia at temperatures ranging from about 100° to about 900° F. to form an aluminum chloride-ammonia complex comprising aluminum chloride polyammoniates having a composition corresponding to 3-6 moles NH 3 /mole AlCl 3 , and hydrolyzing said polyammoniates to obtain high surface area alumina.
Claim 3
Dependent Claim
30 words
Process as defined in claim 1 wherein the aluminum chloride-ammonia complex is heated to temperatures of from about 500° F. to about 900° F. prior to hydrolysis of said complex.
Claim 4
Dependent Claim
18 words
Process as defined in claim 1 wherein said complex is purified by distillation or sublimation prior to hydrolysis.
Claim 5
Dependent Claim
23 words
Process as defined in claim 1 wherein the polyammoniates are hydrolyzed in a hydrolysis solution exhibiting a pH of at least about 9.
Claim 6
Dependent Claim
19 words
Process as defined in claim 1 wherein the resulting alumina is washed to substantially remove any residual chloride ion.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |