US3945919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the environmentally favorable destruction of solid and/or liquid cyanide waste
Assignee: Evonik Operations GmbH
•
Filing: 1972-08-02
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Granted: 1976-03-23
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Expires: 1992-08-02
Abstract
Abstract Solid and/or liquid cyanide waste is destroyed under environmentally favorable conditions by adding water to the cyanide and heating the mixture at high temperature and with the use of pressure.
Inventors
- 👤 Ulrich Schindewolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:19
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/35; C; C02; C02F; C02F1/00; C02F1/02; C02F1/025; A62D2101/00; A62D2101/20; A62D2101/26; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A process for destroying liquid or solid cyanide waste under environmentally favorable conditions consisting essentially of providing the cyanide with water in the presence of a salt of a transition metal as a catalyst and heating the aqueous mixture to a temperature of 120° to 200°C. at superatmospheric pressure to form ammonia and formic acid or a salt thereof.
Claim 2
Dependent Claim
59 words
A process for destroying liquid or solid cyanide waste under environmentally favorable conditions consisting essentially of providing the cyanide with water in the presence of a salt of a transition metal as a catalyst and heating the aqueous mixture to a temperature of 120° to 200°C. at superatmospheric pressure to form ammonia and formic acid or a salt thereof.
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein the cyanide waste comprises a cyanide salt.
Claim 4
Dependent Claim
13 words
A process according to claim 2 wherein the salt is an alkali cyanide.
Claim 5
Dependent Claim
12 words
A process according to claim 2 wherein the salt is sodium cyanide.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein the temperature is 140° to 180°C.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein the metal is iron, cobalt or nickel.
Claim 8
Dependent Claim
22 words
A process according to claim 1 wherein the ammonia formed in the reaction is removed from the reaction zone as a gas.
References Cited (Backward Citations)
US2194438A
Cited
US2261921A
Cited
US2459464A
Cited
US3505217A
Cited
US3617567A
Cited
US3650949A
Cited
US3697421A
Cited
US3772194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |