US4293723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of isobutene to aromatics or polyisobutylene with modified gamma alumina composition
Assignee: Shell USA Inc
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Filing: 1980-04-21
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Granted: 1981-10-06
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Expires: 2000-04-21
Abstract
Abstract A novel aluminous composition prepared by impregnating porous gamma alumina with aluminum hydride and subsequently heating the impregnated alumina to a temperature of from about 300° C. to about 900° C. in a non-oxidizing environment. The composition is useful as a catalyst in reactions catalyzed by acid catalysts.
Inventors
- 👤 Lynn H. Slaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:50
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; C; C07; C07C; C07C2/00; C07C2521/00; C07C2521/02; C07C2521/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A process for dehydrocoupling isobutene to aromatics which comprises contacting the isobutene at about 450° C.-650° C. with an aluminous composition prepared by a process which comprises impregnating a substantially dehydrated gamma alumina with aluminum hydride dissolved in an anhydrous, non-hydroxyl containing organic solvent, drying the impregnated alumina to remove the solvent and subsequently heating the impregnated alumina at a temperature of about 300° to about 900° C. in a nonoxidizing atmosphere wherein the aluminum hydride added ranges from about 3 to about 7 percent by weight measured as aluminum metal.
Claim 2
Dependent Claim
91 words
A process for dehydrocoupling isobutene to aromatics which comprises contacting the isobutene at about 450° C.-650° C. with an aluminous composition prepared by a process which comprises impregnating a substantially dehydrated gamma alumina with aluminum hydride dissolved in an anhydrous, non-hydroxyl containing organic solvent, drying the impregnated alumina to remove the solvent and subsequently heating the impregnated alumina at a temperature of about 300° to about 900° C. in a nonoxidizing atmosphere wherein the aluminum hydride added ranges from about 3 to about 7 percent by weight measured as aluminum metal.
Claim 3
Dependent Claim
82 words
A process for oligomerizing isobutene to a mixture of C 8 , C 12 and C 16 olefins which comprises contacting the isobutene at about 75°-150° C. with an aluminous composition prepared by a process which comprises impregnating a substantially dehydrated gamma alumina with aluminum hydride dissolved in an anhydrous, non-hydroxyl containing organic solvent, drying the impregnated alumina to remove the solvent and subsequently heating the impregnated alumina at a temperature of about 300° to about 900° C. in a nonoxidizing atmosphere.
Claim 4
Dependent Claim
82 words
A process for oligomerizing isobutene to a mixture of C 8 , C 12 and C 16 olefins which comprises contacting the isobutene at about 75°-150° C. with an aluminous composition prepared by a process which comprises impregnating a substantially dehydrated gamma alumina with aluminum hydride dissolved in an anhydrous, non-hydroxyl containing organic solvent, drying the impregnated alumina to remove the solvent and subsequently heating the impregnated alumina at a temperature of about 300° to about 900° C. in a nonoxidizing atmosphere.
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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |