US3636067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile by absorption plural distillation andrecycle of bottoms stream to the absorber
Assignee: Monsanto Co
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Filing: 1969-10-10
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Granted: 1972-01-18
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Expires: 1989-10-10
Abstract
Abstract D R A W I N G A PROCESS FOR THE REDUCTION OF METHACRYLONITRILE CONTENT OF PRODUCT ACRYLONITRILE WHICH COMPRISES INTRODUCING AT LEAST A PORTION OF A BOTTOM FRACTION FROM ANY ACRYLONITRILE HEAVY ENDS SPLITTER COLUMN INTO AN ABSORBING COLUMN, TAKING OVERHEAD FROM SAID ABOSRBING COLUMN A FRACTION CONTAINING AT LEAST PART OF THE METHACRYLONITRILE, TAKING A BOTTOM, FRACTION FROM THE ABSORBING COLUMN, REMOVING THE ABSORBING SOLVENT FROM THE BOTTOM FRACTION AND RETURNING THE ACRYLONTRILE IN THE BOTTOM FRACTION TO THE ACRYLONTRILE HEAVY ENDS SPLITTER COLUMN.
Inventors
- 👤 Gordon H Lovett
- 👤 Ronald E Rambin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:26
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34; Y; Y10; Y10S; Y10S203/00; Y10S203/03
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |