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US4038337A
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Process for isomerizing alkenes
Assignee: SnamProgetti SpA
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Filing: 1975-08-01
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Granted: 1977-07-26
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Expires: 1995-08-01
Abstract
Abstract The invention relates to the skeleton isomerization of alkenes and, more particularly, to the catalyst for the isomerization reaction, the catalyst being prepared by treating an oxide of a metal of the group comprising aluminium, titanium, magnesium, silicon, chrome, zirconium, iron and their mixtures, preferably an active alumina, with a silicon compound, preferably an alkyl ester of the orthosilicic acid, and then subjecting the thus treated oxide to drying and to a controlled oxidation. Thus catalyst is obtained which permits higher yields and selectivity of the isomerization reaction to be achieved, as well as a longer operative life of the catalyst before the regeneration thereof.
Inventors
- 👤 Giovanni Manara
- 👤 Vittorio Fattore
- 👤 Bruno Notari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:32
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/2206; C07C5/2213; B; B01; B01J; B01J37/00; B01J37/08; B01J37/082; B01J21/00; B01J21/12; B01J37/02; B01J37/0201; B01J37/0209; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
106 words
A process for the skeleton isomerization of alkenes which comprises contacting an alkene having at least four carbon atoms or a mixture of alkenes having at least four carbon atoms with a catalyst consisting essentially of alumina previously treated with a silicon compound having the formula ##STR2## wherein X, Y, Z and W are selected from the group of --R, --OR, --Cl, --Br, --SiH 3 , --COOR, --SiH n Cl m , R being either hydrogen or an alkyl, cycloalkyl, aromatic, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms, n and m being whole numbers in the range of from 1 to 3.
Claim 2
Dependent Claim
106 words
A process for the skeleton isomerization of alkenes which comprises contacting an alkene having at least four carbon atoms or a mixture of alkenes having at least four carbon atoms with a catalyst consisting essentially of alumina previously treated with a silicon compound having the formula ##STR2## wherein X, Y, Z and W are selected from the group of --R, --OR, --Cl, --Br, --SiH 3 , --COOR, --SiH n Cl m , R being either hydrogen or an alkyl, cycloalkyl, aromatic, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms, n and m being whole numbers in the range of from 1 to 3.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein R is a methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl, cyclohexyl, cyclopentyl, phenyl, phenyl cyclohexyl or alkylphenyl radical.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein R is a methyl, ethyl, n-propyl, isopropyl, isobutyl or n-butyl radical.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the silicon compound is selected from the group of the methyl, ethyl, n-propyl, isopropyl, isobutyl and n-butyl tetrasilicates.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the silicon compound is tetraethylorthosilicate.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the alumina has deposited thereon from 0.5 to 12% of silica, based on the total weight of the catalyst.
Claim 8
Dependent Claim
25 words
A process of claim 6 wherein the alumina has deposited thereon from 1 to 7% of silica, based on the total weight of the catalyst.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein the process is carried out at temperatures in the range of from 300° to 600° C.
Claim 10
Dependent Claim
21 words
The process of claim 8 wherein the process is carried out at temperatures in the range of 400° to 550° C.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein the process is carried out at a pressure ranging from one to ten atmospheres.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the process is carried out at a feeding space velocity ranging from 0.1 to 20.
Claim 13
Dependent Claim
21 words
The process of claim 11 wherein the process is carried out at a feeding space velocity ranging from 0.2 to 10.
Claim 14
Dependent Claim
18 words
The process of claim 1 wherein the alkene is butene, in a gas mixture consisting essentially of butene.
Claim 15
Dependent Claim
18 words
The process of claim 1 wherein the alkene is pentene, in a gas mixture consisting essentially of pentane.
Claim 16
Dependent Claim
113 words
A process for the skeleton isomerization of alkenes which comprises contacting an alkene having at least four carbon atoms or a mixture of alkenes having at least four carbon atoms with a catalyst consisting essentially of alumina previously treated with a silicon compound having the formula ##STR3## wherein X, Y, Z and W are selected from the group of --R, --OR, --Cl, --Br, --SiH 3 , -- COOR, --SiH n Cl m , R being either hydrogen or a methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl, cyclohexyl, cyclopentyl, phenyl, phenyl cyclohexyl or alkylphenyl radical having up to 30 carbon atoms, n and m being whole numbers in the range of from 1 to 3.
Claim 17
Dependent Claim
113 words
A process for the skeleton isomerization of alkenes which comprises contacting an alkene having at least four carbon atoms or a mixture of alkenes having at least four carbon atoms with a catalyst consisting essentially of alumina previously treated with a silicon compound having the formula ##STR3## wherein X, Y, Z and W are selected from the group of --R, --OR, --Cl, --Br, --SiH 3 , -- COOR, --SiH n Cl m , R being either hydrogen or a methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl, cyclohexyl, cyclopentyl, phenyl, phenyl cyclohexyl or alkylphenyl radical having up to 30 carbon atoms, n and m being whole numbers in the range of from 1 to 3.
Claim 18
Dependent Claim
59 words
A process for producing isobutene which comprises contacting butene at temperatures of from 300° to 600° C. and at a pressure of from one to ten atmospheres with a catalyst consisting essentially of alumina previously treated with tetraethylorthosilicate to deposit thereon silica in an amount of from 0.5 to 12% by weight based on the weight of the catalyst.
Claim 19
Dependent Claim
59 words
A process for producing isobutene which comprises contacting butene at temperatures of from 300° to 600° C. and at a pressure of from one to ten atmospheres with a catalyst consisting essentially of alumina previously treated with tetraethylorthosilicate to deposit thereon silica in an amount of from 0.5 to 12% by weight based on the weight of the catalyst.
Claim 20
Dependent Claim
28 words
The process of claim 16 wherein the silica is deposited in an amount of from 1 to 7% by weight based on the total weight of the catalyst.
Claim 21
Dependent Claim
61 words
A process for producing linear butenes which comprises contacting isobutene at a temperature of from 300° to 600° C. and at a pressure of from one to ten atmospheres with a catalyst consisting essentially of alumina previously treated with tetraethylorthosilicate to deposit thereon silica in an amount of from 0.5 to 12% by weight based on the weight of the catalyst.
Claim 22
Dependent Claim
61 words
A process for producing linear butenes which comprises contacting isobutene at a temperature of from 300° to 600° C. and at a pressure of from one to ten atmospheres with a catalyst consisting essentially of alumina previously treated with tetraethylorthosilicate to deposit thereon silica in an amount of from 0.5 to 12% by weight based on the weight of the catalyst.
Claim 23
Dependent Claim
28 words
The process of claim 18 wherein the silica is deposited in an amount of from 1 to 7% by weight based on the total weight of the catalyst.
Claim 24
Dependent Claim
60 words
A process for producing isopentenes which comprises contacting pentene at a temperature of from 300° to 600° C. and at a pressure of from one to ten atmospheres with a catalyst consisting essentially of alumina previously treated with tetraethylorthosilicate to deposit thereon silica in an amount of from 0.5 to 12% by weight based on the weight of the catalyst.
Claim 25
Dependent Claim
60 words
A process for producing isopentenes which comprises contacting pentene at a temperature of from 300° to 600° C. and at a pressure of from one to ten atmospheres with a catalyst consisting essentially of alumina previously treated with tetraethylorthosilicate to deposit thereon silica in an amount of from 0.5 to 12% by weight based on the weight of the catalyst.
Claim 26
Dependent Claim
28 words
The process of claim 20 wherein the silica is deposited in an amount of from 1 to 7% by weight based on the total weight of the catalyst.
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |