Method for preparing composite chlorine dioxide

Abstract

The invention belongs to the composite chlorine dioxide preparation technical field and in particular relates to a device for producing compound chlorine dioxide and a production method thereof. The device consists of a non-membrane plate electrode reactor, a material solution tank, a metering pump, a power supply, an absorption solution tank and a product solution tank; a cathode set and an anodeset are positioned in the non-membrane plate electrode reactor; the material solution tank is connected with the non-membrane plate electrode reactor by the metering pump; a third metering pump is connected with an inner circulation inlet and an inner circulation outlet; the absorption solution tank is connected with the non-membrane plate electrode reactor; and the production solution tank is connected with the non-membrane plate electrode reactor. The method comprises the following specific steps that: a material solution with a NaCl to NaClO2 mass ratio of between 1.5 and 3.0 and an HCl material solution are respectively prepared; two kinds of material solutions are respectively put in the material solution tank; the flow speeds of the metering pump, etc are adjusted; the reaction timeis controlled between 5 and 10 minutes; when the non-membrane plate electrode reactor is filled with reaction solutions, a power switch is started up; and a current density of the anode set is adjusted between 208.3 and 625A.m<-2>; simultaneously, the third metering pump is started up; the flow speed of the third metering pump is adjusted to one to five times of a flow speed of a mixed solution;and a product can be obtained in a liquid outlet. The method has simple and convenient preparation process, high production efficiency, low cost and suitability for large scale production.

Description

technical field [0001] The invention belongs to the technical field of compound chlorine dioxide preparation, and in particular relates to a production method of compound chlorine dioxide. Background technique [0002] Disinfection is a key step in the water treatment process. Its main function is to kill pathogenic bacteria and other microorganisms harmful to human health in water. Common disinfectants in water treatment mainly include 4 types: Cl 2 , RNH 2 Cl, O 3 and ClO 2 . [0003] Relevant experts compared 4 kinds of disinfectants commonly used in water treatment, and pointed out that the bactericidal ability is: O 3 >ClO 2 > Cl 2 >RNH 2 Cl; the order of disinfection persistence is: RNH 2 Cl>ClO 2 > Cl 2 >O3; harmful to the environment: Cl 2 >RNH 2 Cl>ClO 2 >O 3 ; The cost is: O 3 >ClO 2 >RNH 2 Cl>Cl 2 . Therefore, chlorine dioxide has the best overall performance among the four commonly used bactericidal disinfect...

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Problems solved by technology

[0010] The biggest disadvantage of this method is that chlorine gas, which accounts for half of the chlorine dioxide output, is produced at the same time as chlorine dioxide. Due to the large amount of chlorine gas, strictly speaking, the most basic meaning of adding chlorine dioxide has been lost. , that is to reduce the content of chloroform in water; because the conversion rate of sodium chlorate is usually less than 50% in actual operation, this makes a large amount of unreacted sodium chlorate enter the water distribution system when the dosage is high, which is not necessary But the problem of raw material waste, and make the remaining ClO in water 3 - The concentration of sodium chlorate is higher, causing secondary pollution; moreover, sodium chlorate is the raw material of explosives and matches, and its management and storage must not only meet the requirements of chemical dangerous goods, but also meet the management requirements of explosive raw materials

At present, the purity of chlorine dioxide produced by this method is relatively low, generally below 30%, and it is mixed with Cl 2 、H 2 o 2 , O 3 etc., and the content of chlorine gas is relatively high. In theory, when the product is used in disinfection practice, it is inevitable that there will be the generation of chlorinated disinfection by-products

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