US3658932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isomerization of 4-methylpentene-1
Assignee: Texas Petrochemicals Corp
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Filing: 1969-09-29
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Granted: 1972-04-25
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Expires: 1989-09-29
Abstract
Abstract 4-METHYLPENTENE-1 CAN BE ISOMERIZED IN GOOD YIELDS TO 4-METHYLPENTENE-2 USING A MOLECULAR SIEVE CATALYST HAVING A PORE SIZE OF 4 A. FOR EXAMPLE, TYPE 13X GAVE 65.6 PERCENT YIELD OF 4-MP-2. THE SELECTIVITY OF THE CATALYSTS CAN BE IMPROVED BY SUBSTITUTING A NOBLE METAL ION FOR A PORTION OF THE SODIUM IN THE CATALYST, E.G. YIELD GO TO 73.5 PERCENT. THIS RESULT IS CONTRARY TO THE THERMODYNAMIC EQUILIBRIUM WHICH INDICATES THE PREDOMINATE PRODUCT IS 2-METHYLPENTENE-2 AND 4-MP-2 IS ONLY A MINOR PRODUCT. 4-MP-2 CAN BE REACTED WITH ETHYLENE OVER A 10 PERCENT MO03-ALUMINA CATALYST TO GIVE GOOD YIELDS OF 3-METHYLBUTENE-1 WHICH CAN BE DEHYDROGENATED TO ISOPRENE.
Inventors
- 👤 Robert P Arganbright
- 👤 Mervin M Simpson Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:20
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/068; B01J23/00; B01J23/38; B01J23/40; B01J23/44; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/2791
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |