US4260463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of organic contaminants from waste water
Assignee: PPG Industries Inc
•
Filing: 1979-09-20
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Granted: 1981-04-07
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Expires: 1999-09-20
Abstract
Abstract An aqueous alkaline waste stream containing chlorinated hydrocarbons is treated in an electrolytic diaphragm cell both to reduce the organics content of the waste stream as well as to recover chlorine and caustic values.
Inventors
- 👤 Walker H. Rideout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:31
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; C02F1/4674; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C02F2101/00; C02F2101/30; C02F2101/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A process for reducing the total organic carbon content of waste water containing organic compounds and alkali metal chlorides and recovering chloride and alkali values from the waste water comprising feeding the waste water to the anode compartment of an electrolytic cell, electrolyzing the waste water in the cell to oxidize organic constituents of the waste water to carbon dioxide and generate chlorine gas at the anode and withdrawing alkali metal hydroxide solution having a lower total organic compound content than that of the waste water fed to the anode compartment.
Claim 2
Dependent Claim
91 words
A process for reducing the total organic carbon content of waste water containing organic compounds and alkali metal chlorides and recovering chloride and alkali values from the waste water comprising feeding the waste water to the anode compartment of an electrolytic cell, electrolyzing the waste water in the cell to oxidize organic constituents of the waste water to carbon dioxide and generate chlorine gas at the anode and withdrawing alkali metal hydroxide solution having a lower total organic compound content than that of the waste water fed to the anode compartment.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the waste water has a pH of at least 8.5 and an alkali metal chloride content of at least 5 percent by weight.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the waste water is electrolyzed at a current density of from 50 to 300 amperes per square foot and a voltage of from 2 to 10 volts.
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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |