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US4247420A
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Hydrocarbon conversion catalyst preparation
Assignee: WR Grace and Co Conn
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Filing: 1979-03-23
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Granted: 1981-01-27
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Expires: 1999-03-23
Abstract
Abstract A dense, highly attrition resistant catalyst is prepared by reacting an alkali-metal silicate and aluminate under conditions which produce a thermally and hydrothermally stable cogel having a substantial surface area in pores ranging from about 25 to 75A DEG . The catalyst includes excess silicate obtained as a by-product from a Type Y zeolite synthesis.
Inventors
- 👤 Joseph S. C. Dumoulin
- 👤 Mark A. Seese
- 👤 Edwin W. Albers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:10
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/04; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A process for preparing a silica-alumina hydrogel catalyst which comprises: (a) preparing a silica-alumina cogel by reacting sodium silicate, aluminum sulfate and water to obtain a cogel slurry having a pH of about 9.0 to 9.6; (b) reacting said cogel slurry of step (a) with sodium aluminate to obtain a silica-alumina gel slurry having a pH of about 11.8 to 12.3; (c) reacting the gel slurry of step (b) with aluminum sulfate to produce an acid gel slurry having a pH of about 3.5 to 3.9; (d) reacting the acid gel slurry of step (c) with a sodium silicate containing mother liquor obtained from synthesis of sodium Y zeolite to obtain silica-alumina hydrogel catalyst slurry having a pH of about 3.8 to 4.5; and (e) recovering the catalyst obtained in step (d).
Claim 2
Dependent Claim
132 words
A process for preparing a silica-alumina hydrogel catalyst which comprises: (a) preparing a silica-alumina cogel by reacting sodium silicate, aluminum sulfate and water to obtain a cogel slurry having a pH of about 9.0 to 9.6; (b) reacting said cogel slurry of step (a) with sodium aluminate to obtain a silica-alumina gel slurry having a pH of about 11.8 to 12.3; (c) reacting the gel slurry of step (b) with aluminum sulfate to produce an acid gel slurry having a pH of about 3.5 to 3.9; (d) reacting the acid gel slurry of step (c) with a sodium silicate containing mother liquor obtained from synthesis of sodium Y zeolite to obtain silica-alumina hydrogel catalyst slurry having a pH of about 3.8 to 4.5; and (e) recovering the catalyst obtained in step (d).
Claim 3
Dependent Claim
39 words
The process of claim 1 wherein the said catalyst is recovered by filtration and the recovered composite is washed, spray dried and ion exchanged to lower the Na 2 O content thereof to below about 1 percent by weight.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said catalyst contains from about 10 to 25 percent by weight kaolin added at step (a).
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein said catalyst contains from about 5 to 50 percent by weight NaY zeolite added with the mother liquor at step (d).
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein said catalyst is exchanged with ions selected from the group consisting of ammonium, hydrogen, rare-earth, calcium, magnesium and mixtures thereof.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein a zeolite selected from the group consisting of thermally treated and/or ion exchanged zeolites is added at step (d).
Claim 8
Dependent Claim
31 words
A catalyst obtained by the process of claim 1 wherein said silica-alumina gel component is characterized by a substantial surface area in pores of about 25 to 75 A° in diameter.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |