US4226743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica-alumina hydrogel catalyst
Assignee: WR Grace and Co Conn
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Filing: 1979-03-12
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Granted: 1980-10-07
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Expires: 1999-03-12
Abstract
Abstract A dense, attrition resistant catalyst is prepared by precipitating a silica alumina hydrogel at high pH, and subsequently reacting the alkaline hydrogel with sufficient acid aluminum salt at a pH below 4 to obtain an acidic hydrogel slurry. The slurry is then processed into a catalyst by spray drying, washing and ion exchanging. The catalyst may include substantial quantities of clay and/or crystalline aluminosilicate zeolites.
Inventors
- 👤 Mark A. Seese
- 👤 Edwin W. Albers
- 👤 John S. Magee, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:22
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16; B01J21/12; B01J23/00; B01J23/02; B01J23/04; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/085; B01J29/088; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A process for preparing a silica-alumina hydrogel catalyst which comprises: (a) reacting solutions of sodium silicate and acid aluminum salt at a pH of about 9.0 to 9.6 to obtain a silica-alumina cogel; (b) reacting said silica-alumina cogel with sodium aluminate solution to obtain an alkaline gel slurry having a pH of about 11.8 to 12.3; (c) reacting said gel slurry with an acid aluminum salt to obtain an acid gel slurry having a pH of below 4; (d) reacting said acid gel slurry with a base to precipitate alumina and to obtain a silica-alumina hydrogel catalyst slurry having a pH of about 4.5 to 6; (e) recovering the hydrogel from said slurry; and (f) washing, forming and drying said hydrogel to obtain dense, attrition resistant catalyst particles.
Claim 2
Dependent Claim
128 words
A process for preparing a silica-alumina hydrogel catalyst which comprises: (a) reacting solutions of sodium silicate and acid aluminum salt at a pH of about 9.0 to 9.6 to obtain a silica-alumina cogel; (b) reacting said silica-alumina cogel with sodium aluminate solution to obtain an alkaline gel slurry having a pH of about 11.8 to 12.3; (c) reacting said gel slurry with an acid aluminum salt to obtain an acid gel slurry having a pH of below 4; (d) reacting said acid gel slurry with a base to precipitate alumina and to obtain a silica-alumina hydrogel catalyst slurry having a pH of about 4.5 to 6; (e) recovering the hydrogel from said slurry; and (f) washing, forming and drying said hydrogel to obtain dense, attrition resistant catalyst particles.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said pH at step (c) is lowered to a level of from about 3.5 to 3.9.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said acid aluminum salt is aluminum sulfate.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said alkaline gel slurry at step (b) has a pH of about 12.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein said hydrogel is combined with crystalline alumina silicate zeolite and/or clay.
Claim 7
Dependent Claim
12 words
A cracking catalyst prepared by way of the process of claim 1.
Claim 8
Dependent Claim
28 words
A catalyst of claim 6 which contains from about 10 to 30 percent by weight of a crystalline alumino-silicate zeolite, and 15 to 25 percent by weight clay.
Claim 9
Dependent Claim
15 words
The catalyst of claim 7 wherein said zeolite is exchanged with rare earth metal ions.
References Cited (Backward Citations)
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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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |