Patent US2959539A successfully refreshed from Google Patents.
US3661723A
Expired / Lapsed
US
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Process for recovering of acrylonitrile and hydrocyanic acid by addition of acetonitrile to the aqueous acid neutralized effluent
Assignee: Standard Oil Co
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Filing: 1970-05-15
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Granted: 1972-05-09
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Expires: 1990-05-15
Abstract
Abstract An improved process for the recovery of acrylonitrile, hydrocyanic acid, and acetonitrile from an aqueous solution of these nitriles wherein the aqueous solution is obtained by contacting the product mixture from a catalytic vapor phase reaction of propylene, ammonia, and air, with an acidic solution in an ammonia neutralization column to remove unreacted ammonia therefrom, where the improvement comprises adding additional acetonitrile to the effluent from the ammonia neutralizing column and distilling the aqueous effluent to recover the nitriles from solution.
Inventors
- 👤 Kiyoshi Ohashi
- 👤 Morihiko Ohkuni
- 👤 Otoharu Kurayoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:24
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US26401A
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US3328266A
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US3050546A
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US3257445A
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US3201918A
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US3372986A
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US3444234A
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |