US4469811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a C2 -C4 paraffin dehydrogenation catalyst
Assignee: Shell USA Inc
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Filing: 1983-06-16
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Granted: 1984-09-04
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Expires: 2003-06-16
Abstract
Abstract A process is described wherein C 2 -C 4 paraffins are dehydrogenated over a catalyst which has been prepared by (a) impregnating an Al 2 O 3 carrier with an aqueous solution of a Sn-compound; (b) calcining the impregnated carrier; (c) impregnating the composition with an aqueous solution of a Pt-compound; (d) reducing the composition; (e) removing at least part of any halogen introduced in step (a) and/or (c) by treating the composition with a non-acidic solution comprising NH 4 + ions until the halogen content of the final catalyst amounts to less than 0.1% w; and (f) impregnating the composition with a non-acidic (halogen-free) aqueous solution of an alkali metal compound. The C 2 -C 4 -olefins formed are converted to aromatic gasoline over a catalyst containing a crystalline metal silicate having a ZSM-5 structure.
Inventors
- 👤 Jacques P. Lucien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:29
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/321; C07C5/324; C07C5/325; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/62; B01J23/622; B01J23/626; C07C5/327; C07C5/333; C07C5/3335; C07C5/3337
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A process for the preparation of a catalyst suitable for the dehydrogenation of C 2 -C 4 paraffins, characterized in that the preparation is carried out as follows: (a) impregnating an alumina carrier with an aqueous solution of a tin compound; (b) drying and calcining the composition; (c) impregnating the composition with an aqueous solution of a platinum compound; (d) drying and reducing the composition; (e) removing at least part of the halogen ions, which were introduced into the composition by using a halogen-containing platinum compound and/or tin compound in steps (a) and/or (c), by treating the composition with a non-acidic aqueous solution comprising NH 4 + ions to provide a final catalyst containing less than 0.1%w of halogen; and (f) drying and impregnating the composition with a non-acidic aqueous solution of an alkali metal compound and drying same.
Claim 2
Dependent Claim
139 words
A process for the preparation of a catalyst suitable for the dehydrogenation of C 2 -C 4 paraffins, characterized in that the preparation is carried out as follows: (a) impregnating an alumina carrier with an aqueous solution of a tin compound; (b) drying and calcining the composition; (c) impregnating the composition with an aqueous solution of a platinum compound; (d) drying and reducing the composition; (e) removing at least part of the halogen ions, which were introduced into the composition by using a halogen-containing platinum compound and/or tin compound in steps (a) and/or (c), by treating the composition with a non-acidic aqueous solution comprising NH 4 + ions to provide a final catalyst containing less than 0.1%w of halogen; and (f) drying and impregnating the composition with a non-acidic aqueous solution of an alkali metal compound and drying same.
Claim 3
Dependent Claim
35 words
A process as claimed in claim 1, characterized in that a catalyst is prepared which contains 0.05-2.0 pbw of platinum, 0.1-2.0 pbw of tin and 0.05-10 pbw of alkali metal per 100 pbw of alumina.
Claim 4
Dependent Claim
35 words
A process as claimed in claim 2, characterized in that a catalyst is prepared which contains 0.1-1.0 pbw of platinum, 0.2-1.0 pbw of tin and 0.1-3.0 pbw of alkali metal per 100 pbw of alumina.
Claim 5
Dependent Claim
35 words
A process as claimed in claim 3, characterized in that a catalyst is prepared which contains 0.2-0.4 pbw of platinum, 0.3-0.5 pbw of tin and 0.2-2.5 pbw of alkali metal per 100 pbw of alumina.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1, characterized in that a catalyst is prepared which comprises cesium as the alkali metal.
Claim 7
Dependent Claim
60 words
A process as claimed in claim 1, characterized in that the reducing of the composition mentioned under (d) is carried out at a temperature of 400°-600° C. using hydrogen as the reducing agent and that the removing of halogen ions from the composition mentioned under (e) is carried out by treating the composition with a solution of ammonia in water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |