Patent US4046520A successfully refreshed from Google Patents.
US4046520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasoline production
Assignee: Chevron USA Inc
•
Filing: 1975-06-09
•
Granted: 1977-09-06
•
Expires: 1995-06-09
Abstract
Abstract A process for producing a high-octane gasoline having reduced smog-forming tendencies, which comprises: A. thermally dehydrogenating-cracking isobutane to obtain propylene and isobutene; B. hydrating propylene to obtain isopropanol; C. etherating the isopropanol with the isobutene to obtain t-butyl isopropyl ether; and D. blending the t-butyl isopropyl ether with gasoline-boiling-range hydrocarbons. Preferably the thermal dehydrogenation is carried out under conditions, specifically including a temperature between about 1125° and 1275° F., to produce a molar ratio of isobutene to propylene between 1.0 and 1.25.
Inventors
- 👤 Jacob D. Kemp
- 👤 Robert P. Sieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:12
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/02; C10L1/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
In a process for producing a high-octane gasoline by blending a hydrocarbon mixture of the gasoline range with an ether, the improvement which comprises: a. thermally dehydrogenating-cracking isobutane to obtain a mixture of propylene and isobutene; b. separating the mixture into an isobutene-rich stream and a propylene-rich stream; c. hydrating with a solid acidic hydration catalyst the propylene-rich stream to obtain isopropanol; d. etherating the isopropanol with the isobutene-rich stream to obtain t-butyl isopropyl ether; and e. blending the t-butyl isopropyl ether with gasoline-boiling-range hydrocarbons.
Claim 2
Dependent Claim
85 words
In a process for producing a high-octane gasoline by blending a hydrocarbon mixture of the gasoline range with an ether, the improvement which comprises: a. thermally dehydrogenating-cracking isobutane to obtain a mixture of propylene and isobutene; b. separating the mixture into an isobutene-rich stream and a propylene-rich stream; c. hydrating with a solid acidic hydration catalyst the propylene-rich stream to obtain isopropanol; d. etherating the isopropanol with the isobutene-rich stream to obtain t-butyl isopropyl ether; and e. blending the t-butyl isopropyl ether with gasoline-boiling-range hydrocarbons.
References Cited (Backward Citations)
US2816150A
Cited
US2848522A
Cited
US2813908A
Cited
US2861045A
Cited
US2891999A
Cited
US2803667A
Cited
US3224848A
Cited
US3285977A
Cited
US3482952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |