US3210399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing acrylonitrile free from acetonitrile
Assignee: Osterreichische Stickstoffwerke AG
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Filing: 1962-04-02
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Granted: 1965-10-05
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Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Krzemicki Kasimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A METHOD OF SEPARATING ACETONITRILE FROM A GAS MIXTURE PRODUCED IN THE SYNTHESIS OF ACRYLONITRILE BY REACTION OF PROPYLENE WITH AMMONIA AND OXYGEN, SUCH GAS MIXTURE CONTAINING WATER INSOLUBLE GASES AS MAIN CONSTITUENT AND AS A MAXIMUM CONTAINING 20 PARTS BY WEIGHT OF ACETONITRILE PER 100 PARTS BY WEIGHT OF ACRYLONITRILE WHICH COMPRISES SUBJECTING SUCH GAS MIXTURE PRODUCED IN THE SYNTHESIS TO A WASH WITH WATER AT ATMOSPHERIC PRESSURE AND A TEMPERATURE OF 10* TO 60*C. IN A COUNTERCURRENT EXTRACTION COLUMN, THE QUANTITY OF WATER EMPLOYED FOR SUCH WASH BEING SUFFICIENT TO ABSORB ALL OF THE ACETONITRILE CONTAINED IN THE GAS MIXTURE DURING SUCH WASH AND NOT BEING IN EXCESS OF THAT DERIVED FROM THE EQUATION: X=(T/2)+3 WHEREIN X IS THE QUANTITY OF WATER IN PARTS BY WEIGHT PER PART BY WEIGHT OF ACRYLONITRILE IN THE GAS MIXTURE AND T IS THE ABSORPTION TEMPERATURE EMPLOYED IN THE WASH IN DEGREES C. AND RECOVERING THE ACRYLONITRILE FROM THE GAS MIXTURE THUS FREED FROM ACETONITRILE.
Claim 2
Independent Claim
163 words
A METHOD OF SEPARATING ACETONITRILE FROM A GAS MIXTURE PRODUCED IN THE SYNTHESIS OF ACRYLONITRILE BY REACTION OF PROPYLENE WITH AMMONIA AND OXYGEN, SUCH GAS MIXTURE CONTAINING WATER INSOLUBLE GASES AS MAIN CONSTITUENT AND AS A MAXIMUM CONTAINING 20 PARTS BY WEIGHT OF ACETONITRILE PER 100 PARTS BY WEIGHT OF ACRYLONITRILE WHICH COMPRISES SUBJECTING SUCH GAS MIXTURE PRODUCED IN THE SYNTHESIS TO A WASH WITH WATER AT ATMOSPHERIC PRESSURE AND A TEMPERATURE OF 10* TO 60*C. IN A COUNTERCURRENT EXTRACTION COLUMN, THE QUANTITY OF WATER EMPLOYED FOR SUCH WASH BEING SUFFICIENT TO ABSORB ALL OF THE ACETONITRILE CONTAINED IN THE GAS MIXTURE DURING SUCH WASH AND NOT BEING IN EXCESS OF THAT DERIVED FROM THE EQUATION: X=(T/2)+3 WHEREIN X IS THE QUANTITY OF WATER IN PARTS BY WEIGHT PER PART BY WEIGHT OF ACRYLONITRILE IN THE GAS MIXTURE AND T IS THE ABSORPTION TEMPERATURE EMPLOYED IN THE WASH IN DEGREES C. AND RECOVERING THE ACRYLONITRILE FROM THE GAS MIXTURE THUS FREED FROM ACETONITRILE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |