US3715309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for detoxicating waste waters charged with organic cyanide impurities
Assignee: Air Liquide SA
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Filing: 1970-09-17
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Granted: 1973-02-06
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Expires: 1990-09-17
Abstract
Abstract A PROCESS FOR DETOXICATING WASTE WATERS WHICH CONTAIN ORGANIC CYANIDE IMPURITIES, PARTICULARLY NITRILES CONSISTS IN RAPID DEGRADATION OF THE NITRILES INTO AMIDES AND THEN INTO SALTS OF ORGANIC ACIDS BY TREATMENT WITH HYDROGEN PEROXIDE IN ALKALI MEDIUM, AND THE PER COMPOUNDS. THIS PROCESS, WHICH HAS THE ADVANTAGE OF SATURATING THE EFFLUENTS WITH OXYGEN, PERMITS THE TOTAL PURIFICATION TO A RESIDUAL CONTENT LOWER THAN 0.5 P.P.M. OF ANY EFFLUENT COMING FROM CHEMICAL SYNTHESIS PLANTS, SUCH AS THE FACTORIES FOR THE PRODUCTION OF PLASTIC MATERIALS OR SYNTHETIC FIBERS, AND CONTAINING ORGANIC NITRILES.
Inventors
- 👤 J Zumbrunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |