Patent US3192236A successfully refreshed from Google Patents.
Patent US2681306A successfully refreshed from Google Patents.
US2681306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile by extractive distillation
Assignee: EIDP Inc
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Filing: 1952-02-06
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Granted: 1954-06-15
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Expires: 1972-02-06
Abstract
No abstract record available.
Inventors
- 👤 Harold S Kemp
- 👤 Gilbert M Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:02
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A PROCESS FOR THE PURIFICATION OF ACRYLONITRILE CONTAINING LOW BOILING AND WATER-MISCIBLE IMPURITIES WHICH COMPRISES FEEDING IMPURE CARYLONITRILE INTO A FRACTIONATING COLUME HAVING ABOUT 50 PLATES; INTRODUCING SUFFICIENT WATER INTO SAID COLUMN NEAR THE TOP PLATE OT PROVIDE ABOUT 95 MOL PER CENT OF WATER ON MOST OF THE PLATES OF SAID COLUMN; HEATING SAID ACRYLONITRILE AND SAID WATER; PASSING THE RESULTANT VAPORS CONTAINING ACRYLONITRILE TO A CONDENSER FOR CONDENSATION; AND REMOVING WATER AND SUBSTANTIALLY ALL OF SAID IMPURITIES FROM THE BOTTOM OF SAID COLUMN.
Claim 2
Dependent Claim
85 words
A PROCESS FOR THE PURIFICATION OF ACRYLONITRILE CONTAINING LOW BOILING AND WATER-MISCIBLE IMPURITIES WHICH COMPRISES FEEDING IMPURE CARYLONITRILE INTO A FRACTIONATING COLUME HAVING ABOUT 50 PLATES; INTRODUCING SUFFICIENT WATER INTO SAID COLUMN NEAR THE TOP PLATE OT PROVIDE ABOUT 95 MOL PER CENT OF WATER ON MOST OF THE PLATES OF SAID COLUMN; HEATING SAID ACRYLONITRILE AND SAID WATER; PASSING THE RESULTANT VAPORS CONTAINING ACRYLONITRILE TO A CONDENSER FOR CONDENSATION; AND REMOVING WATER AND SUBSTANTIALLY ALL OF SAID IMPURITIES FROM THE BOTTOM OF SAID COLUMN.
References Cited (Backward Citations)
US2404163A
Cited
US2417635A
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US2415662A
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US2555798A
Cited
US2444589A
Cited
US2551593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |