Patent US3987155A successfully refreshed from Google Patents.
US3987155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-porosity, high-surface area, low-bulk density alumina
Assignee: Vista Chemical Co
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Filing: 1975-03-17
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Granted: 1976-10-19
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Expires: 1995-03-17
Abstract
Abstract A high-porosity, high-surface area, low-density alumina and a method for preparing said alumina. The alumina typically has a surface area from about 260 to about 400 m 2 /g, a pore volume from about 1.0 to about 2.75 cc/g, a loose bulk density from about 7.5 to about 25 lb/ft 3 , and is produced by contacting aqueous alumina slurries with an effective amount of an organic solvent and drying the resulting solvent-aqueous alumina mixture.
Inventors
- 👤 William C. Ziegenhain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:39
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B82; B82Y; B82Y30/00; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; B01J35/61; B01J35/615; B01J35/63; B01J35/638; B01J35/64; B01J35/647; B01J35/653; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16; C01P2006/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A method for producing low-density, high-porosity, high surface area alumina from an aqueous alumina slurry produced by the water hydrolysis of aluminum alkoxides and containing up to about 32 weight percent Al 2 O 3 , said method comprising: a. mixing said aqueous alumina slurry with an organic solvent selected from the group consisting of ethanol, propanol, isopropanol, butanol, isobutanol and tertiary butanol to form a solvent-aqueous alumina mixture containing said solvent in an amount equal to from about 25 to about 250 percent of the amount of solvent required to azeotropically remove the water from said aqueous alumina slurry upon drying said mixture, b. drying said solvent-aqueous alumina mixture; and, c. recovering alumina having a pore volume (0-10000 A) from about 1.0 to about 2.75 cc/g, a loose bulk density from about 7.5 to about 25 lb/ft 3 and a surface area from about 260 to about 400 m 2 /g.
Claim 2
Independent Claim
152 words
A method for producing low-density, high-porosity, high surface area alumina from an aqueous alumina slurry produced by the water hydrolysis of aluminum alkoxides and containing up to about 32 weight percent Al 2 O 3 , said method comprising: a. mixing said aqueous alumina slurry with an organic solvent selected from the group consisting of ethanol, propanol, isopropanol, butanol, isobutanol and tertiary butanol to form a solvent-aqueous alumina mixture containing said solvent in an amount equal to from about 25 to about 250 percent of the amount of solvent required to azeotropically remove the water from said aqueous alumina slurry upon drying said mixture, b. drying said solvent-aqueous alumina mixture; and, c. recovering alumina having a pore volume (0-10000 A) from about 1.0 to about 2.75 cc/g, a loose bulk density from about 7.5 to about 25 lb/ft 3 and a surface area from about 260 to about 400 m 2 /g.
Claim 3
Dependent Claim
45 words
The method of claim 1 wherein said aqueous alumina slurry contains from about 5 to about 25 weight percent Al 2 O 3 and is contacted with said organic solvent in an amount at least sufficient to form an azeotropic mixture with the water present.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein said aqueous alumina slurry contains from about 10 to about 20 weight percent Al 2 O 3 .
Claim 5
Dependent Claim
45 words
The method of claim 1 wherein said alumina has a loose bulk density from about 9 to about 15 lb/ft 3 , a pore volume from about 1.5 to about 2.75 cc/g and a surface area from about 300 to about 400 m 2 /g.
Claim 6
Dependent Claim
131 words
In a method for producing alpha alumina monohydrate by the water hydrolysis of aluminum alkoxides containing from about 1 to about 30 carbon atoms, said method consisting of a. reacting said aluminum alkoxides with an aqueous solution to produce an aqueous alumina slurry and an organic portion; b. separating said organic portion and said aqueous alumina slurry; and c. drying said aqueous alumina slurry, the improvement comprising; mixing an organic solvent selected from the group consisting of ethanol, propanol, isopropanol, butanol, isobutanol, and tertiary butanol with said aqueous alumina slurry to form a solvent-aqueous alumina mixture containing said solvent in an amount equal to from about 25 to about 250 percent of the amount of said solvent required to azeotropically remove the water from said aqueous alumina slurry prior to drying.
Claim 7
Dependent Claim
131 words
In a method for producing alpha alumina monohydrate by the water hydrolysis of aluminum alkoxides containing from about 1 to about 30 carbon atoms, said method consisting of a. reacting said aluminum alkoxides with an aqueous solution to produce an aqueous alumina slurry and an organic portion; b. separating said organic portion and said aqueous alumina slurry; and c. drying said aqueous alumina slurry, the improvement comprising; mixing an organic solvent selected from the group consisting of ethanol, propanol, isopropanol, butanol, isobutanol, and tertiary butanol with said aqueous alumina slurry to form a solvent-aqueous alumina mixture containing said solvent in an amount equal to from about 25 to about 250 percent of the amount of said solvent required to azeotropically remove the water from said aqueous alumina slurry prior to drying.
Claim 8
Dependent Claim
38 words
The improvement of claim 5 wherein said solvent is present in an amount equal to from about 25 to about 250 percent of the amount of solvent required to remove the water present in said aqueous alumina slurry.
References Cited (Backward Citations)
US2970891A
Cited
US3394990A
Cited
US3264063A
Cited
US3419352A
Cited
US3577353A
Cited
DE1903066A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |