US4220529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidative purification of water
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1976-06-23
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Granted: 1980-09-02
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Expires: 1996-06-23
Abstract
Abstract The present invention relates to a process of water treatment, particularly of industrial aqueous effluents and of water from watercourses, such as rivers, lakes, ponds, and the like, comprising oxidation with singlet oxygen.
Inventors
- 👤 Marie-Christine Daude-Lagrave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:21
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/722; C02F1/766; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
The method of oxidative purification of a cyanide-containing aqueous effluent water source comprising treating said water source with singlet oxygen to carry out the oxidative purification to the degree desired, the singlet oxygen is formed in situ by adding to said water source substantially equimolar amounts of hydrogen peroxide and sodium hypochlorite or bromine, the amount of singlet oxygen used is about 20% to 40% in excess of the stoichiometric amount required to react with the cyanide, and the temperature at which the oxidation is carried out is from about 5° to 80° C.
Claim 2
Independent Claim
94 words
The method of oxidative purification of a cyanide-containing aqueous effluent water source comprising treating said water source with singlet oxygen to carry out the oxidative purification to the degree desired, the singlet oxygen is formed in situ by adding to said water source substantially equimolar amounts of hydrogen peroxide and sodium hypochlorite or bromine, the amount of singlet oxygen used is about 20% to 40% in excess of the stoichiometric amount required to react with the cyanide, and the temperature at which the oxidation is carried out is from about 5° to 80° C.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the pH of the cyanide-containing aqueous effluent is maintained above about 9.
Claim 4
Independent Claim
92 words
The method of oxidative purification of a cyanohydrin-containing aqueous effluent water source comprising treating said water source with singlet oxygen to carry out the oxidative purification to the degree desired, the singlet oxygen is formed in situ by adding to said water source substantially equimolar amounts of hydrogen peroxide and sodium hypochlorite or bromine, the amount of single oxygen used is such that the singlet oxygen/CN - molar ratio is between about 2 and 3, and the temperature at which the oxidation is carried out is from about 5° to 80° C.
Claim 5
Independent Claim
92 words
The method of oxidative purification of a cyanohydrin-containing aqueous effluent water source comprising treating said water source with singlet oxygen to carry out the oxidative purification to the degree desired, the singlet oxygen is formed in situ by adding to said water source substantially equimolar amounts of hydrogen peroxide and sodium hypochlorite or bromine, the amount of single oxygen used is such that the singlet oxygen/CN - molar ratio is between about 2 and 3, and the temperature at which the oxidation is carried out is from about 5° to 80° C.
Claim 6
Independent Claim
91 words
The method of oxidative purification of a phenol-containing aqueous effluent water source comprising treating said water source with singlet oxygen to carry out the oxidative purification to the degree desired, the singlet oxygen is formed in situ by adding to said water source substantially equimolar amounts of hydrogen peroxide and sodium hypochlorite or bromine, the amount of singlet oxygen used is such that the single oxygen/phenol molar ratio is between about 4 and 10, and the temperature at which the oxidation is carried out is from about 5° to 80° C.
Claim 7
Independent Claim
91 words
The method of oxidative purification of a phenol-containing aqueous effluent water source comprising treating said water source with singlet oxygen to carry out the oxidative purification to the degree desired, the singlet oxygen is formed in situ by adding to said water source substantially equimolar amounts of hydrogen peroxide and sodium hypochlorite or bromine, the amount of singlet oxygen used is such that the single oxygen/phenol molar ratio is between about 4 and 10, and the temperature at which the oxidation is carried out is from about 5° to 80° C.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |