US5336830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydroisomerisation catalyst and its use in the preparation of isobutene from N-butane
Assignee: SnamProgetti SpA
•
Filing: 1993-10-21
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Granted: 1994-08-09
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Expires: 2013-10-21
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 of 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
2026-11-04 19:43
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: 28
Claim 1
Independent Claim
65 words
A process for the preparation of isobutene by dehydroisomerisation of n-butane, comprising contacting, under dehydroisomerization conditions, a gaseous flow of n-butane and hydrogen, at 450°-600° C., with a fixed catalytic bed formed of a solid granular support of porous gamma-alumina on the surface of which are deposited, as the catalyst, 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica.
Claim 2
Dependent Claim
65 words
A process for the preparation of isobutene by dehydroisomerisation of n-butane, comprising contacting, under dehydroisomerization conditions, a gaseous flow of n-butane and hydrogen, at 450°-600° C., with a fixed catalytic bed formed of a solid granular support of porous gamma-alumina on the surface of which are deposited, as the catalyst, 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica.
Claim 3
Dependent Claim
91 words
A process for the preparation of isobutane by dehydroisomerization of n-butane, comprising contacting, under dehydroisomerization conditions, a gaseous flow of n-butane and hydrogen, at 450°-650° C. with a catalytic system comprising a first catalyst which is formed of a solid granular support of porous gamma-alumina on the surface of which are deposited, as the catalyst, 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica and a second catalyst formed of a porous gamma-alumina on the surface of which is deposited a catalytic quantity of silica.
Claim 4
Dependent Claim
91 words
A process for the preparation of isobutane by dehydroisomerization of n-butane, comprising contacting, under dehydroisomerization conditions, a gaseous flow of n-butane and hydrogen, at 450°-650° C. with a catalytic system comprising a first catalyst which is formed of a solid granular support of porous gamma-alumina on the surface of which are deposited, as the catalyst, 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica and a second catalyst formed of a porous gamma-alumina on the surface of which is deposited a catalytic quantity of silica.
Claim 5
Dependent Claim
124 words
A process for the preparation of isobutene by dehydroisomerization of n-butane, comprising contacting, under dehydroisomerization conditions, a gaseous flow of n-butane and hydrogen at 450°-600° C. with a catalytic system comprising a first catalyst which is formed of a solid granular support of porous gamma-alumina on the surface of which are deposited, as the catalyst, 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica and a second catalyst formed of Boralite B having in its anhydrous or calcined form the following molar composition with the components expressed as oxides: C.sub.2/n 0B.sub.2 O.sub.3 (5-50)SiO.sub.2 where C is selected from the group consisting of a metallic cation of valence n, H + , NH 4 + , and mixtures thereof.
Claim 6
Dependent Claim
124 words
A process for the preparation of isobutene by dehydroisomerization of n-butane, comprising contacting, under dehydroisomerization conditions, a gaseous flow of n-butane and hydrogen at 450°-600° C. with a catalytic system comprising a first catalyst which is formed of a solid granular support of porous gamma-alumina on the surface of which are deposited, as the catalyst, 0.1 to 1% by weight of platinum and 0.5 to 5% by weight of silica and a second catalyst formed of Boralite B having in its anhydrous or calcined form the following molar composition with the components expressed as oxides: C.sub.2/n 0B.sub.2 O.sub.3 (5-50)SiO.sub.2 where C is selected from the group consisting of a metallic cation of valence n, H + , NH 4 + , and mixtures thereof.
Claim 7
Dependent Claim
20 words
The process of claim 2, wherein the weight ratio between the first and second catalysts varies from 20:80 to 80:20.
Claim 8
Dependent Claim
11 words
The process of claim 4, wherein the weight ratio is 70:30.
Claim 9
Dependent Claim
43 words
The process of claim 2, wherein the catalysts are homogeneously distributed in the catalytic bed or are arranged in the form of two contiguous layers, with the layer of the first catalyst being contacted first by the gaseous flow of n-butane and hydrogen.
Claim 10
Dependent Claim
59 words
The process of claim 3, wherein the weight ratio between the first and second catalysts varies from 20:80 to 80:20 and, wherein the catalysts are homogeneously distributed in the catalytic bed or are arranged in the form of two contiguous layers, with the layer of the first catalyst being contacted first by the gaseous flow of n-butane and hydrogen.
Claim 11
Dependent Claim
23 words
The process of claim 1, wherein in the gaseous flow a molar ratio between hydrogen and n-butane is maintained between 1:1 and 5:1.
Claim 12
Dependent Claim
23 words
The process of claim 2, wherein in the gaseous flow, a molar ratio between hydrogen and n-butane is maintained between 1:1 and 5:1.
Claim 13
Dependent Claim
23 words
The process of claim 3, wherein in the gaseous flow, a molar ratio between hydrogen and n-butane is maintained between 1:1 and 5:1.
Claim 14
Dependent Claim
23 words
The process of claim 1, wherein in the gaseous flow, a molar ratio between hydrogen and n-butane is maintained between 1:1 and 3:1.
Claim 15
Dependent Claim
23 words
The process of claim 2, wherein in the gaseous flow, a molar ratio between hydrogen and n-butane is maintained between 1:1 and 3:1.
Claim 16
Dependent Claim
27 words
The process of claim 1, wherein the gaseous flow of n-butane and hydrogen is diluted with nitrogen before being placed in contact with the fixed catalytic bed.
Claim 17
Dependent Claim
45 words
The process of claim 2, wherein the gaseous flow, a molar ratio between hydrogen and n-butane is maintained between 1:1 and 3:1 and, wherein the gaseous flow of n-butane and hydrogen is diluted with nitrogen before being placed in contact with the fixed catalytic system.
Claim 18
Dependent Claim
27 words
The process of claim 3, wherein the gaseous flow of n-butane and hydrogen is diluted with nitrogen before being placed in contact with the fixed catalytic system.
Claim 19
Dependent Claim
42 words
The process of claim 1, wherein the dehydroisomerization reaction is conducted at 450° to 600° C., at a pressure of 200 mm. Hg to 5 kg/cm 2 and with an hourly spatial speed of 0.5 to 5 hour -1 (n-butane weight/catalyst weight).
Claim 20
Dependent Claim
42 words
The process of claim 2, wherein the dehydroisomerization reaction is conducted at 450° to 600° C., at a pressure of 200 mm Hg to 5 kg/cm 2 and with an hourly spatial speed of 0.5 to 5 hour -1 (n-butane weight/catalyst weight).
Claim 21
Dependent Claim
42 words
The process of claim 3, wherein the dehydroisomerization reaction is conducted at 450° to 600° C., at a pressure of 200 mm. Hg to 5 kg/cm 2 and with an hourly spatial speed of 0.5 to 5 hour -1 (n-butane weight/catalyst weight).
Claim 22
Dependent Claim
35 words
The process of claim 16, wherein the temperature is 500° to 580° C., the pressure is 400 mm. Hg to 2 kg/cm 2 , and the spatial speed is 2 to 4 hour -1 .
Claim 23
Dependent Claim
35 words
The process of claim 16, wherein the temperature is 500° to 580° C., the pressure is 400 mm. Hg to 2 kg/cm 2 , and the spatial speed is 2 to 4 hour -1 .
Claim 24
Dependent Claim
35 words
The process of claim 18, wherein the temperature is 500° to 580° C., the pressure is 400 mm. Hg to 2 kg/cm 2 , and the spatial speed is 2 to 4 hour -1 .
Claim 25
Dependent Claim
85 words
A process for the preparation of isobutane by dehydroisomerisation of n-butane, comprising contacting, under dehydroisomerization conditions, gaseous flow of n-butane and hydrogen, at a temperature in the range of 450° C.-600° C., with a fixed catalytic bed formed of a catalyst having 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, and wherein said catalyst Is subjected to a reduction treatment before use in dehydroisomerisation.
Claim 26
Dependent Claim
85 words
A process for the preparation of isobutane by dehydroisomerisation of n-butane, comprising contacting, under dehydroisomerization conditions, gaseous flow of n-butane and hydrogen, at a temperature in the range of 450° C.-600° C., with a fixed catalytic bed formed of a catalyst having 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, and wherein said catalyst Is subjected to a reduction treatment before use in dehydroisomerisation.
Claim 27
Dependent Claim
112 words
A process for the preparation of isobutene by dehydroisomerisation of n-butane, comprising contacting, under dehydroisomerization conditions, gaseous flow of n-butane and hydrogen, at a temperature in the range of 450° C.-600° C., with a fixed catalytic bed formed of a catalytic system having a first 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 and a second catalyst formed of porous gamma-alumina on the surface of which is deposited a catalytic quantity of silica, and wherein said catalytic system is subject to a reduction treatment before use in dehydroisomerisation.
Claim 28
Dependent Claim
112 words
A process for the preparation of isobutene by dehydroisomerisation of n-butane, comprising contacting, under dehydroisomerization conditions, gaseous flow of n-butane and hydrogen, at a temperature in the range of 450° C.-600° C., with a fixed catalytic bed formed of a catalytic system having a first 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 and a second catalyst formed of porous gamma-alumina on the surface of which is deposited a catalytic quantity of silica, and wherein said catalytic system is subject to a reduction treatment before use in dehydroisomerisation.
References Cited (Backward Citations)
US5275995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |