Electrode for electrochlorination

A technology of electrodes and electrolyzers, applied in the field of electrodes for electrochemically generating hypochlorite, which can solve the problems of reduced operating life and easy damage to substrate adhesion

Active Publication Date: 2013-02-06
IND DE NORA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The functioning of the electrodes under alternate polarization conditions allows operation with good efficiency while keeping the electrode surface sufficiently clean from contamination by insoluble deposits; however, cathodic operation under hydrogen evolution of such electrode configurations incurs a reduced operating lifetime, Because the adhesion of the coating to the substrate is easily compromised under these conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Two titanium plates with an area of ​​10 cm2 and a thickness of 0.5 mm were washed with hot water and soap, rinsed with deionized water and degreased with acetone. The panels were then heat treated at 590° C. for 5 hours in a forced air oven. The heat-treated samples were cooled in the same furnace to a temperature of 290 °C, then removed, weighed, and treated with 27% H2O containing 5 g / L titanium at a temperature of 87 °C 2 SO 4 Perform etching treatment. After two hours of treatment, the sample was washed again, dried and weighed, and a titanium loss of about 200 g / m2 was recorded. Rough profile inspection with a Mitutoyo SJ-301 profilometer shows an R of 5.2-5.3 microns a value and an R of approximately 32 µm z value.

[0015]An internal catalytic coating was applied on both faces of the plates thus treated by thermal decomposition of a first precursor solution containing 47 mol % Ru, 24.7 mol % Ir and 28.3 mol % Ta. From 20% by weight of RuCl 3 A commercial ...

Embodiment 2

[0022] Example 1 was repeated under the same conditions, but with the difference that a first precursor solution containing 47 mol % Ru, 24.7 mol % Ir and 28.3 mol % Nb was used by adding 1 M NbCl 5 solution instead of TaCl 5 solution is obtained. The electrodes obtained were characterized in the accelerated life test of Example 1, which gave substantially the same results as in the previous examples, while the cell was operated at a constant cell voltage of about 3 volts for about 215 hours, followed by a voltage increase, After a total of 320 hours it settles at a new constant value, about 600 mV higher than the previous value. In this case, the test was extended for a total of 400 hours, with the cell voltage shifting slightly towards higher values ​​during the last 40 hours.

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Abstract

The invention relates to an electrode for electrochemical generation of hypochlorite. The electrode comprises a valve metal substrate coated with a catalytic system consisting of two super-imposed layers of distinct composition and having a different activity towards hypochlorite anodic generation from chloride solutions. The electrode has a high duration in cathodic operation conditions, imparting self-cleaning characteristics thereto when used in combination with an equivalent one with periodic polarity reversal. Moreover, the deactivation of the electrode at the end of its life cycle occurs in two subsequent steps, allowing to schedule the substitution thereof with a significant notice period.

Description

technical field [0001] The present invention relates to electrodes for the electrochemical generation of hypochlorite. Background technique [0002] The production of hypochlorite by electrolysis of dilute brines of alkali metal chlorides, for example by electrolysis of aqueous sodium chloride or seawater, is one of the most common processes in the field of industrial electrochemistry. The production of hypochlorite is often accompanied by the production of various by-products (commonly classified under the name "active chlorine") from the oxidation of chlorides, in some cases producing oxygenated species such as perchlorate oxides, most of which have a very limited lifetime; for brevity, the ensemble of such products in aqueous solution (consisting mainly of alkali metal hypochlorite and hypochlorous acid in proportions largely dependent on pH) is referred to herein as hypochlorite. Depending on the production volume and concentration, the product hypochlorite can be appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04
CPCC02F2001/46119C02F1/46109C02F2001/46142C25B1/26C02F1/4674C02F2201/4613C25B11/0484C25B11/0405C02F2303/14C25B11/051C25B11/093C25B11/02
Inventor A·L·安托兹M·贝纳德托A·卡尔德拉拉C·佩佐尼C·厄戈赫
Owner IND DE NORA SPA
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