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Electrochemical cell and method for operating the same

An electrolytic cell and electrochemical technology, applied in chemical instruments and methods, electrolytic processes, electrolytic components, etc., can solve the problems of reduced freedom of choice and serious harmful effects

Inactive Publication Date: 2010-01-06
IND DE NORA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, for specially designed anode materials that are forced to operate as cathodes, the detrimental effects of current reversal can also be very severe, and hydrogen evolution usually occurs in current reversal mode, which is not true for all coatings and Substrates are non-hazardous reactions
The freedom of choice for the materials of construction of the electrolyser to be operated with periodic current inversion is therefore reduced and often compromises are required to satisfy all the different requirements

Method used

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  • Electrochemical cell and method for operating the same
  • Electrochemical cell and method for operating the same
  • Electrochemical cell and method for operating the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] With commodity RuO 2 / TiO 2 Coating (ELTECH Systems Corp, Chardon, OH, U.S.A.) coated titanium anodes (0.89 mm thick). The cathode was a titanium metal mesh (0.89 mm thick) etched in 18% HCl at 90°C. These electrodes were cut into 5.5 cm x 15.25 cm. A 3.2mm titanium rod was connected to the anode and the other to the cathode. Electrode pairs were fabricated by placing small rubber spacers (0.55 mm) at each corner of the anode, then clamping the mesh cathode to the anode with plastic clips. A 6 amp diode (Radio Shack 276-1661 ) was connected to each electrode, oriented such that the anode current would flow to the anode and the cathode current would flow to the cathode. Opposite ends of the diodes away from the electrodes are connected together. Insert two of these anode / cathode pairs into the plastic housing and secure at each end with a 2” (5.08cm) diameter threaded connection to form an electrochemical cell. Connect the positive lead of the DC power supply to one...

Embodiment 2

[0045] at 1000A / m 2 of 4g / l NaCl, 70g / l Na at room temperature 2 SO 4 Run the two electrode pairs as in Example 1 with current reversals every 1 minute until the voltage increases rapidly (this indicates passivation). The time required for two separate tests was 1750 hours and 1950 hours. In contrast, operation with the same material as anode and cathode (ie unattached mesh cathode) resulted in lifetimes of only 226 hours and 273 hours. Thus, the lifetime of the coated titanium substrates of the present invention is extended by more than 7 times on average.

Embodiment 3

[0047] An electrolytic cell containing two electrode pairs as described in Example 1 was run as in Example 1 with current reversal times of 10 minutes, 1 hour, 3 hours and 6 hours. After 5-8 days of operation, the accumulated scale was significantly less than that of electrolyzers operated in reverse without current.

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Abstract

The invention relates to an electrochemical cell comprising an arrangement of anode / cathode pairs, in which the accumulation of scales or similar fouling phenomena are prevented by alternatively operating either the anode or the cathode of one pair and the corresponding counterelectrode of the adjacent pair, the non-operated electrode of each pair being at open circuit. The electrolyte dissolves the scale deposits on the electrodes at open circuit, without resorting to harmful current reversal.

Description

field of invention [0001] The present invention relates to the field of electrochemical cell (electrochemical cell), in particular to an electrolytic cell (cell) for electrolytic treatment of water. Background of the invention [0002] Several electrochemical cells for electrolytic water treatment are known in the prior art, for example cells that generate hypochlorite and ozone for water disinfection, or that generate oxygen for biocidal treatment. One of the main problems of these electrolysers is the formation of fouling products, such as scales of insoluble salts, algae or other microbial growth, etc., especially on the cathode surfaces in the electrolysers. Such fouling products are generally non-conductive and detrimental to the current efficiency of the electrochemical process, as well as preventing the electrolyte from reaching active reaction sites, and must be removed periodically. In principle, this means dismantling the electrolyser in which the fouled electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C02F103/42C25B9/17
CPCC02F2001/46157C02F2001/46133C02F2001/46185C02F1/46104C02F2201/4617C02F2103/42C02F2103/008C02F1/4674C02F2001/46138C02F2201/4616C02F2201/4615C02F2001/46142C25B15/00C02F2201/4613C25B11/04C25B9/17
Inventor K·L·哈迪
Owner IND DE NORA SPA