US3920547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of destroying cyanides
Assignee: Houston Research Inc
•
Filing: 1974-05-06
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Granted: 1975-11-18
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Expires: 1994-05-06
Abstract
Abstract A method for the destruction of cyanides in an aqueous cyanide solution, particularly an aqueous solution of cyanides complexed with iron, wherein such cyanides are destroyed by contacting an aqueous solution thereof with an ozone-containing gas, while simultaneously irradiating the aqueous cyanide solution with ultraviolet light. The method is preferably carried out while maintaining the pH of the aqueous cyanide solution within the range of pH 5 to pH 9. Increased reactivity can also be achieved by heating the aqueous cyanide solution. The method is preferably carried out by contacting the aqueous cyanide solution and an ozone-containing gas in a plurality of separate contact zones, countercurrently or with parallel flow, with the irradiation of the aqueous cyanide solution with ultraviolet light being carried out in at least one of the separate contact zones, preferably at least the final contact zone.
Inventors
- 👤 Richard Lee Garrison
- 👤 Jr Herman W Prengle
- 👤 Charles E Mauk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:31
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; C02F1/325; C02F1/72; C02F1/78; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
45 words
A METHOD FOR THE DESTRUCTION OF CYANIDES IN AN AQUEOUS CYANIDE SOLUTION, WHICH COMPRISES: CONTACTING AN AQUEOUS SOLUTION OF CYANIDES WITH AN OZONECONTAINING GAS IN AN AMOUNT EFFECTIVE TO REACT WITH AND DESTROY THE CYANIDES; AND SIMULTANEOUSLY IRRADIATING SAID AQUEOUS CYANIDES SOLUTION WITH ULTRAVIOLET LIGHT.
Claim 2
Independent Claim
45 words
A METHOD FOR THE DESTRUCTION OF CYANIDES IN AN AQUEOUS CYANIDE SOLUTION, WHICH COMPRISES: CONTACTING AN AQUEOUS SOLUTION OF CYANIDES WITH AN OZONECONTAINING GAS IN AN AMOUNT EFFECTIVE TO REACT WITH AND DESTROY THE CYANIDES; AND SIMULTANEOUSLY IRRADIATING SAID AQUEOUS CYANIDES SOLUTION WITH ULTRAVIOLET LIGHT.
Claim 3
Dependent Claim
25 words
The method of claim 1, wherein the pH of said aqueous cyanide solution is maintained within the range of about pH 5 to about pH
Claim 4
Dependent Claim
30 words
The method of claim 1, wherein said aqueous cyanide solution is heated to a temperature of from about 30* to about 70* C. during the contact with ozone containing gas.
Claim 5
Dependent Claim
18 words
The method of claim 1, wherein said aqueous cyanide solution and ozone-containing gas are contacted in parallel flow.
Claim 6
Dependent Claim
18 words
The method of claim 1, wherein said aqueous cyanide solution and ozone-containing gas are contacted while flowing coutercurrently.
Claim 7
Dependent Claim
42 words
The method of claim 1, wherein said aqueous cyanide solution and ozone-containing gas are contacted in a plurality of separate contact zones and the simultaneous irradiation with ultraviolet light is carried out in at least the last of said separate contact zones.
Claim 8
Dependent Claim
25 words
The method of claim 6, wherein the irradiation with ultraviolet light is carried out in the final contact zone of said plurality of contact zones.
Claim 9
Dependent Claim
12 words
The method of claim 1, wherein said cyanide is complexed with iron.
Claim 10
Independent Claim
173 words
A METHOD FOR THE DESTRUCTION OF CYANIDES COMPLEX WITH IRON IN AN AQUEOUS SOLUTION WHICH COMPRISES: PROVIDING A FEEDSTOCK COMPRISING AN AQUEOUS SOLUTION OF CYANIDES COMPLEX WITH IRON AND A PLURALITY OF CONTACT ZONES IN SERIES: PASSING SAID AQUEOUS SOLUTION OF CYANIDES COMPLEXED WITH IRON INTO A FIRST CONTACT ZONE OF SAID PLURALITY OF CONTACT ZONE IN SERIES: SIMULTANEOUSLY PASSING AN OZONE-CONTAINING GAS INTO THE LELAST CONTACT ZONE OF SAID PLURALITY OF CONTACT ZONES IN SERIES, THE AMOUNT OF OZONE BEING EFFECTIVE TO REACT WITH SAID DESTROY SAID CYANIDES COMPLEX WITH IRON, WHEREBY SAID AQUEOUS SOLUTION OF CYANIDES COMPLEXED WITH IRON AND OZONE-CONTAINING GAS COME INTO MUTUAL CONTACT IN EACH OF SAID PLURALITY OF CONTACT ZONES WHILE PASSING COUNTERCURRENTLY THERETHROUGH; SIMULTANEOUSLY IRRADIATING AT LEAST ONE OF SAID PLURALITY OF CONTACT ZONES WITH ULTRAVIOLET LIGH FROM AN ULTRAVIOLET LIGHT SOURCE; WITHDRAWING FROM SAID FIRST OF SAID PLURALITY OF CONTACT ZONES SAID OZONE-CONTAINING GAS, LEANER IN OZONE; AND WITHDRAWING FROM SAID LAST OF SAID PLURALITY OF CONTACT ZONES SAID AQUEOUS SOLUTION WITH REDUCED CYANIDE CONTENT.
Claim 11
Independent Claim
173 words
A METHOD FOR THE DESTRUCTION OF CYANIDES COMPLEX WITH IRON IN AN AQUEOUS SOLUTION WHICH COMPRISES: PROVIDING A FEEDSTOCK COMPRISING AN AQUEOUS SOLUTION OF CYANIDES COMPLEX WITH IRON AND A PLURALITY OF CONTACT ZONES IN SERIES: PASSING SAID AQUEOUS SOLUTION OF CYANIDES COMPLEXED WITH IRON INTO A FIRST CONTACT ZONE OF SAID PLURALITY OF CONTACT ZONE IN SERIES: SIMULTANEOUSLY PASSING AN OZONE-CONTAINING GAS INTO THE LELAST CONTACT ZONE OF SAID PLURALITY OF CONTACT ZONES IN SERIES, THE AMOUNT OF OZONE BEING EFFECTIVE TO REACT WITH SAID DESTROY SAID CYANIDES COMPLEX WITH IRON, WHEREBY SAID AQUEOUS SOLUTION OF CYANIDES COMPLEXED WITH IRON AND OZONE-CONTAINING GAS COME INTO MUTUAL CONTACT IN EACH OF SAID PLURALITY OF CONTACT ZONES WHILE PASSING COUNTERCURRENTLY THERETHROUGH; SIMULTANEOUSLY IRRADIATING AT LEAST ONE OF SAID PLURALITY OF CONTACT ZONES WITH ULTRAVIOLET LIGH FROM AN ULTRAVIOLET LIGHT SOURCE; WITHDRAWING FROM SAID FIRST OF SAID PLURALITY OF CONTACT ZONES SAID OZONE-CONTAINING GAS, LEANER IN OZONE; AND WITHDRAWING FROM SAID LAST OF SAID PLURALITY OF CONTACT ZONES SAID AQUEOUS SOLUTION WITH REDUCED CYANIDE CONTENT.
Claim 12
Dependent Claim
40 words
The method of claim 9, wherein the pH of said aqueous solution of cyanides complexed with iron is maintained within the range of about pH 5 to about pH 9 in at least one of said plurality of contact zones.
Claim 13
Dependent Claim
36 words
The method of claim 9, wherein said aqueous solution of cyanides complexed with iron is heated to a temperature of about 30* to about 70* C. in at least one of said plurality of contact zones.
Claim 14
Dependent Claim
27 words
The method of claim 9, wherein the irradiation with ultraviolet light is carried out in at least the last contact zone of said plurality of contact zones.
Claim 15
Dependent Claim
22 words
The method of claim 9, wherein said aqueous solution of cyanides complexed with iron and ozone-containing gas are contacted in parallel flow.
References Cited (Backward Citations)
US1420046A
Cited
US2459464A
Cited
US2981682A
Cited
US3510424A
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US3660277A
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US3732163A
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US3825494A
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US3819516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |