US4532370A
Expired / Lapsed
US
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Process for synthesizing 1-butene by dimerization of ethylene
Assignee: IFP Energies nouvelles
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Filing: 1984-09-20
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Granted: 1985-07-30
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Expires: 2004-09-20
Abstract
Abstract Process for synthesizing 1-butene by dimerization of ethylene, in the presence of a catalyst formed by reacting, in a hydrocarbon medium, a trialkylaluminum with a mixture of an alkyl titanate with an ether. The activity and the selectivity are improved when adding the ether to a pre-formed mixture of alkyl titanate with trialkylaluminum.
Inventors
- 👤 Nhuong Le Quan
- 👤 Daniel Cruypelinck
- 👤 Dominique Commereuc
- 👤 Yves Chauvin
- 👤 Gerard Leger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:59
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/02; B01J31/0201; B01J31/0211; B01J31/0212; B01J31/12; B01J31/14; B01J31/143; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/30; B01J2531/00; B01J2531/40; B01J2531/46; C07C2531/00; C07C2531/02; C07C2531/12; C07C2531/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
An improved process for converting ethylene to 1-butene wherein ethylene is contacted with a catalyst obtained by reacting an alkyl titanate with an alkylaluminum compound, characterized in that said catalyst results from reacting a preformed mixture of alkyl titanate and ether, in a molar ratio ether/titanate from 0.5:1 to 10:1, with an aluminum compound of formula AIR 3 or AIR 2 H, wherein each R is a hydrocarbyl radical.
Claim 2
Dependent Claim
69 words
An improved process for converting ethylene to 1-butene wherein ethylene is contacted with a catalyst obtained by reacting an alkyl titanate with an alkylaluminum compound, characterized in that said catalyst results from reacting a preformed mixture of alkyl titanate and ether, in a molar ratio ether/titanate from 0.5:1 to 10:1, with an aluminum compound of formula AIR 3 or AIR 2 H, wherein each R is a hydrocarbyl radical.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the molar ratio of the ether to the alkyl titanate is from about 1:1 to 3:1.
Claim 4
Dependent Claim
23 words
A process according to claim 1, wherein said reaction is performed in a solvent consisting of hexenes recovered as by-products of the reaction.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein the ether is diethylether, isopropylether, dibutylether, methyltert-butylether, tetrahydrofuran, 1,4-dioxane, dihydropyran or ethyleneglycol dimethylether.
Claim 6
Dependent Claim
11 words
A process according to claim 4, wherein the ether is 1,4-dioxane.
Claim 7
Dependent Claim
11 words
A process according to claim 4, wherein the ether is tetrahydrofuran.
Claim 8
Dependent Claim
49 words
A process according to claim 1, wherein the reaction of the preformed mixture of alkyl titanate and ether with the aluminum compound is performed at a temperature from -10° to +45° C. in ethylene atmosphere and the temperature is then increased to 50°-70° C. to convert ethylene to 1-butene.
Claim 9
Dependent Claim
34 words
A process according to claim 7, wherein the admixed catalyst components are maintained at a temperature from -10° to +45° C. for 30 seconds to 24 hours before increasing the temperature to 50°-70° C.
Claim 10
Dependent Claim
62 words
A process according to claim 1, wherein the molar ratio of the aluminum compound to the titanium compound is from 1:1 to 20:1 and the titanium concentration is from 10 -4 to 0.5 mole per liter when the catalyst is used for converting ethylene to 1-butene at a temperature from 20° to 150° C. under a pressure from 0.5 to 8 MPa.
Claim 11
Dependent Claim
15 words
A process according to claim 9 wherein the temperature is from 20° to 70° C.
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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |