US4141828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating waste water
Assignee: Osaka Gas Co Ltd
•
Filing: 1977-08-10
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Granted: 1979-02-27
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Expires: 1997-08-10
Abstract
Abstract A process for treating ammonia-containing waste water which comprises subjecting the ammonia-containing waste water to wet oxidation with an oxygen-containing gas in the presence of a catalyst while maintaining the waste water at a temperature of 100 to 370° C. and at pressure permitting the waste water to remain in the liquid phase, the catalyst comprising at least one of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold, tungsten and water-insoluble compounds thereof.
Inventors
- 👤 Nobuhiko Okada
- 👤 Yoichi Nakanishi
- 👤 Yoshiaki Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:13
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/725; C02F11/00; C02F11/06; C02F11/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A process for treating ammonia-containing waste water which comprises subjecting at a pH of at least 9 the ammonia-containing waste water to wet oxidation with an oxygen-containing gas in the presence of a catalyst while maintaining the waste water at a temperature of 100 to 370° C. and at pressure permitting the waste water to remain in the liquid phase, the catalyst being supported by a carrier and comprising at least one of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold, tungsten and water-insoluble compounds thereof.
Claim 2
Dependent Claim
88 words
A process for treating ammonia-containing waste water which comprises subjecting at a pH of at least 9 the ammonia-containing waste water to wet oxidation with an oxygen-containing gas in the presence of a catalyst while maintaining the waste water at a temperature of 100 to 370° C. and at pressure permitting the waste water to remain in the liquid phase, the catalyst being supported by a carrier and comprising at least one of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold, tungsten and water-insoluble compounds thereof.
Claim 3
Dependent Claim
24 words
A process as defined in claim 1 wherein the ammonia-containing waste water is subjected to wet oxidation at a pH of 10 to 12.5.
Claim 4
Dependent Claim
31 words
A process as defined in claim 1 wherein the active component of the catalyst comprises at least one of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.
Claim 5
Dependent Claim
34 words
A process as defined in claim 1 wherein the active component of the catalyst comprises at least one of water-insoluble compounds of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.
Claim 6
Dependent Claim
31 words
A process as defined in claim 4 wherein the active component of the catalyst comprises at least one of oxides of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, copper and tungsten.
Claim 7
Dependent Claim
40 words
A process as defined in claim 5 wherein the active component of the catalyst comprises at least one of iron sesquioxide, tri-iron tetroxide, cobalt monoxide, nickel monoxide, ruthenium dioxide, rhodium sesquioxide, palladium monoxide, iridium dioxide, cupric oxide and tungsten dioxide.
Claim 8
Dependent Claim
24 words
A process as defined in claim 4 wherein the active component of the catalyst comprises at least one of ruthenium chloride and platinum chloride.
Claim 9
Dependent Claim
24 words
A process as defined in claim 4 wherein the active component of the catalyst comprises at least one of ruthenium sulfide and rhodium sulfide.
Claim 10
Dependent Claim
25 words
A process as defined in claim 1 wherein the ammonia-containing waste water is subjected to wet oxidation in a reactor of the fixed bed type.
Claim 11
Dependent Claim
25 words
A process as defined in claim 1 wherein the ammonia-containing waste water is subjected to wet oxidation in a reactor of the fluidized bed type.
Claim 12
Dependent Claim
26 words
A process as defined in claim 1 wherein the oxygen-containing gas is fed in an amount 1 to 1.5 times the required theoretical amount of oxygen.
Claim 13
Dependent Claim
26 words
A process as defined in claim 11 wherein the oxygen-containing gas is fed in an amount 1.05 to 1.2 times the required theoretical amount of oxygen.
Claim 14
Dependent Claim
21 words
A process as defined in claim 1 wherein the reaction is carried out at a temperature of 250° to 320° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |