US4098874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of alumina catalyst support or carrier material
Assignee: Honeywell UOP LLC
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Filing: 1977-04-18
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Granted: 1978-07-04
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Expires: 1997-04-18
Abstract
Abstract An alumina composition particularly useful as a catalyst support or carrier material is disclosed. The alumina is characterized by a method of preparation which comprises admixing an alpha-alumina monohydrate with an alkaline solution having a pH of at least about 7.5 and forming a stable suspension. A salt of a strong acid is commingled with the suspension to form a paste or dough which is subsequently formed into extrudates, and dried and calcined.
Inventors
- 👤 Roy T. Mitsche
- 👤 George N. Pope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:46
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J21/00; B01J21/02; B01J21/04; C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C01F7/025; C01F7/34; C01F7/36; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/62; B01J23/622; B01J23/624; B01J23/64; B01J23/656; B01J23/6567; B01J35/00; B01J35/60; C01P; C01P2006/00; C01P2006/11; C01P2006/12; C01P2006/14; C01P2006/16; C01P2006/17; C07; C07C; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
An alumina preparation method comprising: (a) admixing a finely divided alpha-alumina monohydrate with an aqueous ammonical solution having a pH of at least about 7.5 and forming a stable suspension; (b) commingling a metal salt of a strong acid with said suspension and converting said suspension to a extrudable paste or dough; (c) extruding said paste or dough; and (d) drying and thereafter calcining the extruded alumina product at a temperature of from about 450°- 850° C.
Claim 2
Dependent Claim
77 words
An alumina preparation method comprising: (a) admixing a finely divided alpha-alumina monohydrate with an aqueous ammonical solution having a pH of at least about 7.5 and forming a stable suspension; (b) commingling a metal salt of a strong acid with said suspension and converting said suspension to a extrudable paste or dough; (c) extruding said paste or dough; and (d) drying and thereafter calcining the extruded alumina product at a temperature of from about 450°- 850° C.
Claim 3
Dependent Claim
25 words
The method of claim 1 further characterized with respect to step (a) in that said alumina is a water hydrolysis product of an aluminum alkoxide.
Claim 4
Dependent Claim
30 words
The method of claim 1 further characterized with respect to step (a) in that said alumina is a water hydrolysis product of an aluminum alkoxide produced by the Ziegler process.
Claim 5
Dependent Claim
32 words
The method of claim 1 further characterized with respect to step (a) in that said alkaline solution is an aqueous ammoniacal solution having a pH of from about 7.5 to about 8.5.
Claim 6
Dependent Claim
24 words
The method of claim 1 further characterized with respect to step (b) in that said metal salt of a strong acid is a nitrate.
Claim 7
Dependent Claim
24 words
The method of claim 1 further characterized with respect to step (b) in that said metal salt of a strong acid is aluminum nitrate.
Claim 8
Dependent Claim
45 words
The method of claim 1 further characterized with respect to step (b) in that said metal salt of a strong acid is aluminum nitrate employed in an amount to provide from about 2 to about 10 wt. % of the alumina in the final product.
Claim 9
Dependent Claim
26 words
The method of claim 1 further characterized with respect to step (b) in that said suspension comprises from about 30 to about 60 wt. % alumina.
Claim 10
Dependent Claim
71 words
The method of claim 1 further characterized with respect to step (d) in that said alumina product is calcined at a temperature of from about 550° to about 750° C. to provide a surface area of from about 165 to about 215 square meters per gram, and a pore volume of from about 0.3 to about 0.4 cc/g in the pore diameter range of from about 20 to about 80 Angstroms.
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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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |