Device and method for preparing chlorine dioxide by using electrolysis method

Abstract

The invention discloses a device and a method for preparing high-purity chlorine dioxide by using a single electrolyte sodium chlorite electrolysis method. The device comprises a diaphragm type electrolytic cell, a gas pump set, an absorption tower, an exhaust gas absorption tower and a storage tank, wherein two diaphragms are arranged inside the diaphragm type electrolytic cell; the two diaphragms partition the electrolytic cell into three chambers with an anode chamber in the middle, and a first cathode chamber and a second cathode chamber on both sides; metal wire fillers are filled in theanode chamber and the cathode chambers to reduce the inter-electrode resistance between an anode and a cathode; a gas distribution plate is arranged at the bottom of the anode chamber, and ClO2 gas generated by the anode is discharged through the positive pressure by blasting air, and the product is removed in time to increase the reaction rate; the cathode chambers also blast air through the airdistribution plate, and hydrogen generated by the cathode is safely discharged after being diluted. By the exhaust gas absorption tower in the device, a small amount of chlorine dioxide can be effectively recovered and introduced into the anode chamber for recycling without discharge and without pollution gas exhaust.

Description

technical field [0001] The present invention relates to a generator for producing chlorine dioxide aqueous solution by electrochemical method, in particular to a generator and method for electrolytically producing chlorine dioxide with sodium chlorite as raw material. Background technique [0002] At present, there are two methods for domestic production of chlorine dioxide: chemical method and electrochemical method. Chemical production devices generally have huge equipment, complex processes, and high manufacturing costs. [0003] The electrolysis method uses sodium chlorate or sodium chlorite or sodium chloride as an electrolyte to prepare chlorine dioxide. It is considered to be a promising preparation method because of its high efficiency, safe reaction, and simple process. It is very suitable for Miniaturization and industrialization. However, there are still many problems in the current electrolytic production of chlorine dioxide, which makes it difficult to apply o...

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Problems solved by technology

The electrolysis method using sodium chlorate as a raw material has problems such as complex process, high power consumption, low electrolysis efficiency, and the need to use strong acid in the electrolysis process.

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