US4133871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing alumina
Assignee: Vista Chemical Co
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Filing: 1977-08-01
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Granted: 1979-01-09
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Expires: 1997-08-01
Abstract
Abstract An improvement in the method of preparing alumina by water hydrolysis of aluminum alkoxides is disclosed. Briefly, the improvement comprising admixing the water and aluminum alkoxide under high velocity conditions prior to passing the resulting admixture to the reactor. The improved process results in a product having improved physical properties, particularly pore volume and bulk density.
Inventors
- 👤 William C. Ziegenhain
- 👤 Ronald L. Poe
- 👤 Larry L. Bendig
- 👤 John F. Scamehorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:42
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
In the method of preparing alumina by water hydrolysis of aluminum alkoxides in a reactor, and wherein the alkoxide groups contain from 2 to 40 carbon atoms, the improvement comprising admixing the water and aluminum alkoxide, wherein said aluminum alkoxide has a velocity of greater than 40 feet per second, prior to passing the resulting admixture to the reactor, said improved process being characterized further in that (a) the resulting product has improved pore volume and bulk density properties and (b) the velocity is defined by the formula V = F/p A wherein V = velocity in feet per second, F = rate of flow in pounds per second, p = density in pounds per cubic foot, and A = orifice area in square feet.
Claim 2
Dependent Claim
125 words
In the method of preparing alumina by water hydrolysis of aluminum alkoxides in a reactor, and wherein the alkoxide groups contain from 2 to 40 carbon atoms, the improvement comprising admixing the water and aluminum alkoxide, wherein said aluminum alkoxide has a velocity of greater than 40 feet per second, prior to passing the resulting admixture to the reactor, said improved process being characterized further in that (a) the resulting product has improved pore volume and bulk density properties and (b) the velocity is defined by the formula V = F/p A wherein V = velocity in feet per second, F = rate of flow in pounds per second, p = density in pounds per cubic foot, and A = orifice area in square feet.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the amount of water is in the range of about 0.5 to about 5 pounds per pound of aluminium alkoxide.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the water has a velocity of greater than 40 feet per second.
Claim 5
Dependent Claim
17 words
The method of claim 2 wherein the alkoxide has a velocity greater than 100 feet per second.
Claim 6
Dependent Claim
41 words
The method of claim 2 wherein (a) the temperature of the water is in the range of about 50 to about 150° C. and (b) the temperature of the alkoxide is in the range of about 40 to about 150° C.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein the water has a velocity of greater than 40 feet per second.
Claim 8
Dependent Claim
18 words
The method of claim 5 wherein the alkoxide has a velocity of greater than 100 feet per second.
Claim 9
Dependent Claim
61 words
The method of claim 1 wherein (a) the amount of water is in the range of about 1.0 to about 30 pounds per pound of aluminum alkoxide, (b) the alkoxide has a velocity of greater than 170 feet per second, and (c) the temperature of the water and the alkoxide is in the range of about 70 to about 120° C.
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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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |