Patent US3661723A successfully refreshed from Google Patents.
US3661723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering of acrylonitrile and hydrocyanic acid by addition of acetonitrile to the aqueous acid neutralized effluent
Assignee: Standard Oil Co
•
Filing: 1970-05-15
•
Granted: 1972-05-09
•
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 19:34
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US26401A
Cited
US3328266A
Cited
US3050546A
Cited
US3257445A
Cited
US3201918A
Cited
US3372986A
Cited
US3444234A
Cited
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 |