US2684978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing acrylonitrile
Assignee: Monsanto Chemicals Ltd
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Filing: 1951-04-02
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Granted: 1954-07-27
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Expires: 1971-04-02
Abstract
No abstract record available.
Inventors
- 👤 Carlyle J Stehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:51
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE PROCESS FOR PURIFYING A WATER SOLUTION OF ACRYLONITRILE CONTAINING ACETYLENIC POLYMERFORMING IMPURITIES WHICH COMPRISES TREATING SAID WATER SOLUTION WITH STEAM AT A TEMPERATURE SUFFICIENTLY HIGH SO AS TO VOLATILIZE AT LEAST 1% BUT NOT IN EXCESS OF 50% OF SAID ACRYLONITRILE, WHEREBY SAID POLYMER-FORMING IMPURITIES ARE SUBSTANTIALLY COMPLETELY ELIMINATED FROM SAID WATER SOLUTION AND A GASEOUS MIXTURE OF SAID IMPURITIES AND ACRYLONITRILE OBTAINED, THEN TREATING SAID GASEOUS MIXTURE WITH WATER AND GASEOUS ACETYLENE, WHEREBY SAID ACRYLONITRILE IS DISSOLVED IN SAID WATER AND SAID IMPURITIES TRANSFERRED TO SAID ACETYLENE, THEN TREATING SAID ACETYLENE WITH AN ABSORBENT WHEREBY SAID POLYMER FORMING IMPURITIES ARE REMOVED THEREFROM.
Claim 2
Dependent Claim
104 words
THE PROCESS FOR PURIFYING A WATER SOLUTION OF ACRYLONITRILE CONTAINING ACETYLENIC POLYMERFORMING IMPURITIES WHICH COMPRISES TREATING SAID WATER SOLUTION WITH STEAM AT A TEMPERATURE SUFFICIENTLY HIGH SO AS TO VOLATILIZE AT LEAST 1% BUT NOT IN EXCESS OF 50% OF SAID ACRYLONITRILE, WHEREBY SAID POLYMER-FORMING IMPURITIES ARE SUBSTANTIALLY COMPLETELY ELIMINATED FROM SAID WATER SOLUTION AND A GASEOUS MIXTURE OF SAID IMPURITIES AND ACRYLONITRILE OBTAINED, THEN TREATING SAID GASEOUS MIXTURE WITH WATER AND GASEOUS ACETYLENE, WHEREBY SAID ACRYLONITRILE IS DISSOLVED IN SAID WATER AND SAID IMPURITIES TRANSFERRED TO SAID ACETYLENE, THEN TREATING SAID ACETYLENE WITH AN ABSORBENT WHEREBY SAID POLYMER FORMING IMPURITIES ARE REMOVED THEREFROM.
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) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |