US2782149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of refining acrylonitrile by distillation
Assignee: Kemanord AB
•
Filing: 1952-12-22
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Granted: 1957-02-19
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Expires: 1972-12-22
Abstract
No abstract record available.
Inventors
- 👤 Sunden Olof
- 👤 Carlsson Carl Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:21
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD OF REMOVING DIVINYL ACETYLENE FROM A CRUDE ACRYLONITRILE, WHICH COMPRISES THE STEPS OF SUBJECTING THE CRUDE ACRYLONITRILE TO FRACTIONAL DISTILLATION, REGULATING THE WATER CONTENT IN THE STILL SO THAT THE WATER CONTENT IN THE TOP PRODUCT AT LEAST CORRESPONDS WITH THE WATER CONTENT IN A TERNARY AZEOPTROPIC MIXTURE OF ACRYLONITRILE, DIVINYL ACETYLENE AND WATER, WITH A BOILING POINT OF 67.5*C. DISTILLING OFF SAID TERNARY AZEOTRIPIC MIXTURE AND RECOVERING THE ACRYLONITRILE SUBSTANTIALLY FREE FROM DIVINYL ACETYLENE AND WATER AT THE BOTTOM OF THE STILL.
Claim 2
Independent Claim
85 words
THE METHOD OF REMOVING DIVINYL ACETYLENE FROM A CRUDE ACRYLONITRILE, WHICH COMPRISES THE STEPS OF SUBJECTING THE CRUDE ACRYLONITRILE TO FRACTIONAL DISTILLATION, REGULATING THE WATER CONTENT IN THE STILL SO THAT THE WATER CONTENT IN THE TOP PRODUCT AT LEAST CORRESPONDS WITH THE WATER CONTENT IN A TERNARY AZEOPTROPIC MIXTURE OF ACRYLONITRILE, DIVINYL ACETYLENE AND WATER, WITH A BOILING POINT OF 67.5*C. DISTILLING OFF SAID TERNARY AZEOTRIPIC MIXTURE AND RECOVERING THE ACRYLONITRILE SUBSTANTIALLY FREE FROM DIVINYL ACETYLENE AND WATER AT THE BOTTOM OF THE STILL.
References Cited (Backward Citations)
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US2417635A
Cited
US2415662A
Cited
US2579638A
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US2621204A
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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) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |