Patent BE498734A successfully refreshed from Google Patents.
US3832418A
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Isobutylene dimerization process
Assignee: Gulf Research and Development Co
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Filing: 1972-05-01
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Granted: 1974-08-27
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Expires: 1992-05-01
Abstract
Abstract A process for selectively dimerizing isobutylene contained in a C4 olefin mixture employing a catalyst composition comprising a presulfided Group VI or Group VIII metal deposited on an acidic, amorphous silica-alumina support.
Inventors
- 👤 P Bercik
- 👤 A Henke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:30
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/20; B01J23/00; B01J23/70; B01J23/74; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/24; C07C2521/00; C07C2521/12; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/755
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A process for selectively dimerizing isobutylene which consists essentially of contacting the mixture of C4 mono-olefins containing isobutylene under dimerization conditions with a sulfided catalyst composition consisting essentially of 0.5 to 20 weight percent of nickel and fluorine on an acidic amorphous silica-alumina support, the maximum concentration of fluorine being 5.0 weight percent of said catalyst composition, said support comprising from 50 to 90 weight percent silica, said sulfided catalyst containing at least 0.5 mol of sulfur per mol of nickel, and recovering therefrom a mixture containing a dimer of isobutylene.
Claim 2
Dependent Claim
31 words
The process of claim 2 wherein contact between the C4 olefin mixture and catalyst composition is conducted at a liquid weight hourly space velocity in the range of 0.5 to 2.8.
Claim 3
Dependent Claim
46 words
The process of claim 3 wherein the C4 feed mixture is a liquid, the temperature in said dimerization zone is maintained in the range of 70* to 300* F., and the pressure in said dimerization zone is maintained in the range of 70 to 600 psig.
Claim 4
Dependent Claim
46 words
The process of claim 3 wherein the C4 olefin feed is a vapor, the temperature of the dimerization zone is maintained in the range of 300* to 480* F., and the pressure in said dimerization zone is maintained in the range of 600 to 1,200 psig.
References Cited (Backward Citations)
US3161697A
Cited
US3257473A
Cited
US3340319A
Cited
US3405191A
Cited
US3518323A
Cited
US3527839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |