US5275995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydroisomerization catalyst and its use in the preparation of isobutene from n-butane
Assignee: SnamProgetti SpA
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Filing: 1991-07-29
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Granted: 1994-01-04
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Expires: 2011-07-29
Abstract
Abstract A catalyst is described for the preparation of isobutene by dehydroisomerization of n-butane consisting of a solid, granular support of porous gamma-alumina on the surface of which catalytic quantities of platinum, silica and preferably also one or more promotors are deposited. In a preferred form of embodiment this catalyst is used with a second catalyst which may be formed of Boralite B or a solid granular support gamma-alumina on the surface of which catalytic quantities of silica are deposited. The present invention relates also to the process of dehydroisomerization of n-butane to isobutene in which the catalyst is used and the relative operating conditions.
Inventors
- 👤 Giuseppe Bellussi
- 👤 Aldo Giusti
- 👤 Laura Zanibelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:15
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; C; C07; C07C; C07C5/00; C07C5/32; C07C5/373
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
A catalyst for the preparation of isobutene by dehydroisomerisation of n-butane, said catalyst formed of a solid granular support of porous gamma-alumina on the surface of which are deposited 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica.
Claim 2
Dependent Claim
44 words
A catalyst for the preparation of isobutene by dehydroisomerisation of n-butane, said catalyst formed of a solid granular support of porous gamma-alumina on the surface of which are deposited 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica.
Claim 3
Dependent Claim
16 words
A catalyst in accordance with claim 1 containing in addition catalytic quantities of tin and/or indium.
Claim 4
Dependent Claim
49 words
A catalyst in accordance with claim 1, characterised in that the support is gamma-alumina with a surface area of 100 to 400 m 2 /g and a total volume of pore of 0.5 to 1.5 ml/g, in the form of granules of a size of 0.4 to 5 mm.
Claim 5
Dependent Claim
18 words
A catalyst in accordance with claim 1 containing silica in a quantity of 1 to 2.5% by weight.
Claim 6
Dependent Claim
43 words
A catalyst in accordance with claim 2 containing tin in a quantity of 0.1 to 1% and indium in a quantity of 0.05 to 1% by weight, with the weight ratios of platinum/indium of 0.3:1 to 1.5:1 and platinum/tin of 0.5:1 to 2:1.
Claim 7
Dependent Claim
162 words
A process for the preparation of the catalyst as described in claim 1, said process consisting of: 1. decomposing alkyl orthosilicate in the presence of gamma-alumina, at a temperature of between 100° and 400° C. at a pressure of 10 to 30 kg/cm 2 for a contact time of 1 to 20 hours, and treating the resulting product first in an inert atmosphere at a temperature of 100° to 400° C., for a time of 1 to 4 hours, and then in an oxidizing atmosphere at a temperature of 400° to 600° C. for a time of 2 to 8 hours; 2. impregnating the product obtained in step 1) with an acid aqueous solution of a compound of platinum, and possibly tin/or indium, drying the said impregnated support at a temperature of 100° to 130° C. in an air flow and calcining at a temperature of 400° to 600° C. in an air flow for a time of 2 to 8 hours.
Claim 8
Dependent Claim
31 words
A catalytic system comprising a first catalyst, according to claim 1, and a second catalyst formed of porous gamma-alumina on the surface of which is deposited a catalytic quantity of silica.
Claim 9
Dependent Claim
63 words
A catalytic system comprising a first catalyst, according to claim 1, and a second catalyst formed of Boralite B having in its anhydrous and calcined form the following molar composition with the components expressed as oxides: C.sub.2/n O.B.sub.2 O.sub.3.(5-50) SiO.sub.2 where C is selected from a metallic cation of valence n, H + , NH 4 + , or a mixture of these.
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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) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |