Patent US3637889A successfully refreshed from Google Patents.
US3637889A
Expired / Lapsed
US
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Process for separating a tertiary olefin
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1970-03-09
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Granted: 1972-01-25
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Expires: 1990-03-09
Abstract
Abstract A PROCESS FOR SEPARATING A TERTIARY OLEFIN PRESENT IN C4-C5 CRACKED PETROLEUM FRACTIONS BY (1) REACTING THE C4-C5 FRACTION WITH A C1 TO C4 PRIMARY ALIPHATIC ALCOHOL AT 70 TO 150*C. IN THE PRESENCE OF A SMALL AMOUNT OF SULFURIC ACID CATALYST TO SELECTIVELY CONVERT A TERTIARY OLEFIN, SUCH AS ISOBUTYLENE, TO A TERTIARY BUTYL ALKYL ETHER, (2) SEPARATING THE ETHER FROM THE UNREACTED OLEFINS AND PASSING IT OVER A METAL SULFATE CATALYST MAINTAINED AT 150 TO 250* C. TO RECOVER THE ISOBUTYLENE AND THE ALCOHOL. THE ALCOHOL MAY THEN BE RECYCLED TO THE FIRST REACTION. BOTH REACTIONS CAN BE PERFORMED WITH HIGH REACTIVITY AND SELECTIVITY.
Inventors
- 👤 Yoshihiro Watanabe
- 👤 Jiro Kobayashi
- 👤 Tooru Tokumaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:52
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C7/00; C07C7/148; C07C7/14875; C07C7/14891; C07C2527/00; C07C2527/02; C07C2527/053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |