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US3616356A
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Electrolysis in a particulate carbon packing
Assignee: CLARENCE H ROY
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Filing: 1967-09-18
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Granted: 1971-10-26
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Expires: 1987-09-18
Abstract
Abstract This invention relates to the electrolytic treatment of water containing dissolved salts by means of a cell in which the anode and the cathode are separated by a particulate carbon packing. The electrolytic process precipitates metallic impurities as metal oxides, hydroxides, sulfides, etc., which may be filtered from the cell effluent and liberates gases as such. Process and apparatus serve for the purification of water and recovery of impurities.
Inventors
- 👤 Clarence H Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:01
CPC Classifications
C; C25; C25D; C25D21/00; C25D21/16; C25D21/20; C02; C02F; C02F1/00; C02F1/46; C02F1/4604; C02F1/461; C02F1/46104; C02F1/46109; C02F1/46114
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
37 words
The process of claim 1 wherein the electrodes consist of a carbon anode and a stainless steel cathode and wherein said aqueous solution contains no more than 5 percent of impurities comprising dissolved metals in salt form.
Claim 2
Dependent Claim
18 words
The process of claim 1 wherein the lines of force converge from one electrode surface to the other.
Claim 3
Dependent Claim
47 words
The process of claim 2 wherein said dissolved metals in salt form are compounds selected from the group consisting of metal cyanides, alkali metal chromates, chromic acid, iron salts, nickel salts, lead salts, tin salts, the salt content of urine and the salt content of sea water.
Claim 4
Dependent Claim
23 words
The process of claim 4 wherein the voltage differential across the electrodes is in the range of about 1 to 25 volts DC.
Claim 5
Dependent Claim
77 words
A process for the purification of an aqueous solution containing impurities comprising dissolved metal salts, which comprises electrolyzing said solution between a pair of electrodes spaced at least about one inch apart wherein the space between the electrodes is continuously packed with carbon particles having a size of at least one by one millimeters and wherein the voltage differential across said electrodes is at least about 1 volt, said electrolysis being continued until decomposition products are formed.
Claim 6
Dependent Claim
11 words
The process of claim 6 wherein said impurities contain organic matter.
Claim 7
Dependent Claim
39 words
The process of claim 6 wherein said aqueous solution coNtains no more than 5 percent by weight of dissolved metal salts and wherein the anode electrode is carbon or graphite and the cathode electrode is iron or stainless steel.
Claim 8
Dependent Claim
16 words
The process of claim 8 including the step of separating the phases produced by said electrolysis.
Claim 9
Dependent Claim
16 words
The process of claim 9 wherein said phase separation is effected by filtering the electrolyzed solution.
Claim 10
Dependent Claim
22 words
The process of claim 10 wherein before filtering, said electrolyzed solution is passed through a strainer effective to remove said carbon particles.
Claim 11
Dependent Claim
18 words
The process of claim 6 wherein the lines of force converge from one electrode surface to the other.
Claim 12
Dependent Claim
17 words
The process of claim 8 wherein the voltage differential is no more than about 25 volts DC.
Claim 13
Dependent Claim
35 words
The process of claim 8 wherein the metal salts are selected from salts of zinc, cadmium, gold, chromium, lead, tin, nickel, the metal salt content of sea water, and the metal salt content of urine.
Claim 14
Dependent Claim
23 words
The process of claim 8 wherein the metal salts are selected from zinc cyanide, cadmium cyanide, gold cyanide, lead nitrate, and stannous chloride.
Claim 15
Dependent Claim
12 words
The process of claim 6 wherein the aqueous solution is sea water.
Claim 16
Dependent Claim
20 words
The process of claim 8 wherein the aqueous solution comprises the rinsings from a chrome plating bath containing hexavalent chromium.
Claim 17
Dependent Claim
18 words
The process of claim 17 wherein the pH of the aqueous solution subjected to electrolysis is about 1.3.
Claim 18
Dependent Claim
11 words
The process of claim 8 wherein the aqueous solution contains urine.
Claim 19
Dependent Claim
93 words
A process for removing dissolved inorganic matter from the rinsings of an aqueous hexavalent chrome plating bath comprising electrolyzing said rinsings in a packed bed of carbon particles having a size of at least 1 by 1 millimeters between electrodes wherein the space between said electrodes is at least about 1 inch and the bed of carbon particles is a continuous bed between the electrodes, and the voltage differential across said electrodes is at least about 1 volt AC, and separating any precipitate which may form from the aqueous phase of purified water.
Claim 20
Dependent Claim
20 words
The process of claim 20 wherein the electrodes are selected from the group consisting of stainless steel and graphite electrodes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |