US3970554A
Expired / Lapsed
US
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Process for detoxification of cyanides and nitriles with peroxygen compounds
Assignee: Evonik Operations GmbH
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Filing: 1974-10-16
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Granted: 1976-07-20
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Expires: 1994-10-16
Abstract
Abstract Waste water containing cyanides, cyanohydrins and/or organic nitriles are detoxified by adding a peroxide compound in the presence of iodide ion or free iodine, in a given case in the presence of silver ions.
Inventors
- 👤 Joachim Fischer
- 👤 Helmut Knorre
- 👤 Gerhard Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:16
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/766; C02F1/722
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
63 words
In a process for the detoxification of waste water containing a member of the group consisting of inorganic cyanides, organic unsubstituted nitriles and organic cyanohydrins by the addition of a peroxygen compound the improvement comprising carrying out the detoxification in the presence of an iodine source selected from the group consisting of iodine, iodide ions and a mixture of iodine and iodide ions.
Claim 2
Dependent Claim
63 words
In a process for the detoxification of waste water containing a member of the group consisting of inorganic cyanides, organic unsubstituted nitriles and organic cyanohydrins by the addition of a peroxygen compound the improvement comprising carrying out the detoxification in the presence of an iodine source selected from the group consisting of iodine, iodide ions and a mixture of iodine and iodide ions.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein silver ions are also present.
Claim 4
Dependent Claim
46 words
The process of claim 2 wherein the peroxygen compounds is hydrogen peroxide and the materials added to the waste water consist essentially of (1) an iodine source which is iodine, iodide ions or a mixture of iodine and iodide ions, (2) silver ions, (3) hydrogen peroxide.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein the iodine source is sodium iodide, sodium triiodide, potassium iodide or potassium triiodide and the silver is employed as silver nitrate or silver iodide.
Claim 6
Dependent Claim
20 words
The process of claim 2 wherein the pH is between 6 and 12 and the temperature between 10° and 80°C.
Claim 7
Dependent Claim
13 words
The processs of claim 5 wherein the pH is between 8 and 12.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the pH is between 9 and 11.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein the pH is between 10 and 11.
Claim 10
Dependent Claim
12 words
The process of claim 5 wherein the peroxygen compound is hydrogen peroxide.
Claim 11
Dependent Claim
53 words
The process of claim 5 wherein the iodine source is used in an amount of 1 to 50 mg I - per liter of waste water to be detoxified and the silver is used in an amount of 1 to 1000 micrograms Ag + per cubic meter of waste water to be detoxified.
Claim 12
Dependent Claim
29 words
The process of claim 10 wherein the silver is used in an amount of 1 to 10 micrograms Ag + per cubic meter of waste water to be detoxified.
Claim 13
Dependent Claim
38 words
The process of claim 11 wherein the iodine source is used in an amount of 5 mg I - and the silver in an amount of 1 microgram Ag + per liter of waste water to be detoxified.
Claim 14
Dependent Claim
30 words
The process of claim 5 wherein the iodine source is sodium iodide, sodium triiodide, potassium iodide or potassium triiodide and the silver is employed as silver nitrate or silver iodide.
Claim 15
Dependent Claim
28 words
The processs of claim 13 wherein the iodine source is aqueous potassium iodide or aqueous potassium triiodide solution and the silver is employed as aqueous silver nitrate solution.
Claim 16
Dependent Claim
14 words
The process of claim 13, wherein the progress of the detoxification is measured potentiographically.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |