US3654094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying propylene oxide by plural stage distillation
Assignee: Daicel Corp
•
Filing: 1970-03-18
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Granted: 1972-04-04
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Expires: 1990-03-18
Abstract
Abstract A PROCESS FOR PURIFYING PROPYLENE OXIDE FROM A REACTION MIXTURE CONTAINING PROPYLENE OXIDE, PROPYLENE, PERACETIC ACID, ACETIC ACID AND THE REACTION SOLVENT, IN WHICH THE REACTION MIXTURE IS DISTILLED UNDER A PRESSURE OF 1.3-5.0 KG.CM.2 SO THAT A DISTILLATE CONTAINING PROPYLENE OXIDE AND PROPYLENE IS DISCHARGED FROM THE COLUMN HEAD, CONDENSING THE DISTILLATE AND THEN SUBJECTING THE CONDENSED DISTILLATE TO A SECOND DISTILLATION TO RECOVER PROPYLENE OXIDE FROM THE BOTTOM OF THE SECOND DISTILLATION COLUMN.
Inventors
- 👤 Kazuo Yamagishi
- 👤 Osamu Kageyama
- 👤 Yoshiaki Numa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:57
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/32; Y; Y10; Y10S; Y10S203/00; Y10S203/09
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |