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Process control method for reducing damage of electrolytic cell shutdown to cathode chamber

A process control and electrolytic cell technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of inability to rapidly reduce ion exchange membrane damage, electrochemical corrosion, increase in power consumption, etc., to inhibit electrochemical corrosion, save production costs, The effect of prolonging the service life

Inactive Publication Date: 2020-09-11
TIANWEI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the equipment cost is low, and the disadvantage is that it cannot quickly reduce the damage of hypochlorous acid and chlorine gas in the brine of the anode chamber to the ion exchange membrane.
[0005] In summary, after the electrolyzer is shut down, the chlorine gas and hypochlorous acid in the brine can not only form a reverse current, but also form electrochemical corrosion in the cathode chamber, causing the cathode chamber coating to fall off, and the metal nickel loses electrons and turns into nickel ions
The coating falls off and adheres to the ion exchange membrane to increase the voltage of the cell and increase the power consumption. The service life of the protective tank frame without coating will decrease rapidly. Therefore, chlor-alkali production needs to invest a lot of money to effectively reduce the damage to the cathode chamber caused by the shutdown of the electrolytic cell.

Method used

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  • Process control method for reducing damage of electrolytic cell shutdown to cathode chamber

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Effect test

Embodiment 1

[0016] Embodiment 1: In order to describe the present invention in more detail, it will be explained in conjunction with the accompanying drawings. The specific method is as follows: when the current of the electrolytic cell (1) is greater than 6.0KA during the current reduction process, the refined brine and acid flow adjustment should be adjusted in time according to the process index Valve, brine adding acid flow regulating valve into the tank, 15% return brine flow regulating valve, reduce the flow of refined brine adding acid, brine adding acid flow into the tank, and 15% return brine flow according to the process indicators. When the current of the electrolytic cell drops to 6.0KA, close the flow regulating valve of refined brine adding acid, the flow regulating valve of adding acid to brine entering the tank, and the flow regulating valve of 15% return brine. Under the low current operation of the electrolyzer, wait for the anode outlet pH monitor (6) to stabilize and op...

Embodiment 2

[0017]Embodiment 2: A process control method for reducing the damage to the cathode chamber caused by the shutdown of the electrolytic cell, including the electrolytic cell (1), the brine high level tank (2), the alkali high level tank (3), the cathode circulation tank (4), and the anode circulation tank (5); anode part: Secondary refined brine (a) enters the high level tank of brine, under the action of high head difference, enters the anode chamber of the electrolytic cell (1) by gravity through the main pipe of refined brine (12), and under the action of direct current, the secondary The refined brine is electrolyzed in the anode chamber to produce chlorine gas and light brine. The light brine flows into the anode circulation tank (5) by itself, and the 15% light brine is returned to the brine line through the 15% brine line to be introduced into the refined brine main pipe of the electrolytic cell to protect the titanium tube; the cathode Part: the catholyte enters the alka...

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Abstract

The invention relates to a process control method for reducing damage of electrolytic cell shutdown to a cathode chamber. The system includes an electrolytic cell (1), a brine elevated tank (2), an alkali elevated tank (3), a cathode circulating tank (4) and an anode circulating tank (5). In the current reduction process of the electrolytic cell, the acid adding amount of saline water and 15% of returned saline water flow are gradually reduced, a proper amount of liquid caustic soda is added into saline water with the ratio of 2:1 after the electrolytic cell is stopped, so that hypochlorous chloride and chlorine with high oxidability in an anode chamber rapidly generate sodium hypochlorite with high stability and weak oxidability after the electrolytic cell is stopped; therefore, damage ofstopping to a cathode chamber is reduced. The method has the characteristics of low cost, safety, reliability and simple process.

Description

technical field [0001] The invention belongs to the technical field of chlor-alkali production, and in particular relates to a process control method for reducing damage to a cathode chamber caused by electrolyzer shutdown, and is especially suitable for bipolar ion membrane electrolyzers. Background technique [0002] After decades of development, the bipolar ion-exchange membrane electrolyzer has achieved world-renowned achievements in energy saving and environmental protection, and has gradually become the standard configuration of contemporary chlor-alkali. The bipolar ionic membrane electrolyzer is mainly composed of a unit cell and an ion exchange membrane, and the metal composite separator divides the cell into two chambers, the cathode and the anode. , the brine that has been refined for the second time needs to be acidified twice before electrolysis. The first acid addition is to remove the excess carbonate ions added during the first brine purification, and the sec...

Claims

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Application Information

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IPC IPC(8): C25B1/46C25B15/02C25B1/26C25B15/08
CPCC25B1/46C25B15/02C25B1/26C25B15/08
Inventor 宋晓玲尹建平马海滨候伟孔繁超李伟刚陆俊梁国军刘培锋马爱民李金英
Owner TIANWEI CHEM
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