Composite chlorine dioxide preparation method

Abstract

The invention discloses preparation raw materials for composite chlorine dioxide, wherein the preparation raw materials comprise, by weight, 0.5-3 parts of chlorate, 0.1-1.5 parts of a chlorine source, 0.1-1 part of a reducing agent, 1-5 parts of an acidity control agent, and 1-5 parts of water. The invention further discloses a preparation method of the composite chlorine dioxide, wherein the preparation method comprises: a, weighing the preparation raw materials for composite chlorine dioxide; b, completely dissolving the chlorate and the chlorine source in the water to form a solution A; c,mixing the reducing agent and the acidity control agent to form a solution B; and d, under a negative pressure condition, uniformly mixing the solution A and the solution B in a reaction kettle, wherein the reaction temperature is 50-80 DEG C. According to the present invention, the reaction temperature of the method is low so as to save a large amount of energy; the proportion of the main raw materials participating in the reaction is high while the ratio of generated chlorine dioxide to chlorine gas is greater than the national standard; and the safety of composite chlorine dioxide is increased.

Description

technical field [0001] The invention relates to the field of disinfection and sterilization, in particular to a preparation method of composite chlorine dioxide. Background technique [0002] In the water treatment process, disinfection is a key link in water treatment and an important measure to prevent the spread of diseases, ensure safe water supply, and improve people's health. At present, at home and abroad, the methods of adding liquid chlorine, sodium hypochlorite, ozone, chlorine dioxide, or irradiating ultraviolet rays to the water source to be treated are mainly used to disinfect, kill algae, and deodorize the water. In practical application, the cost of liquid chlorine is low, but it is not safe in the process of transportation, storage and use, and it will also undergo halogenation reaction with organic pollutants in water (such as humic acid, etc.) Carcinogenic, teratogenic, and sudden-causing "three-cause" substances, such as chloroform, haloacetic acid, nitro...

AI Technical Summary

Problems solved by technology

In practical application, the cost of liquid chlorine is low, but it is not safe in the process of transportation, storage and use, and it will also undergo halogenation reaction with organic pollutants in water (such as humic acid, etc.) Carcinogenic, teratogenic, and sudden-causing "three-cause" substances, such as chloroform, haloacetic acid, nitrosamines, etc.; sodium hypochlorite has poor stability, short storage time, poor disinfection effect, and also produces three-cause toxic substances ;Ozone disinfection effect is good, but the investment and application cost is extremely high; although ultraviolet rays do not produce three-causing substances, they do not have continuous disinfection ability, and the use conditions are limited; chlorine dioxide not only has good disinfection effect, but also has low cost, and does not produce three However, during the disinfection process, disinfection by-products such as chlorate and chlorite will be formed, which will affect the water quality compliance

[0003] Therefore, the mode of preparing chlorine dioxide and chlorine gas by sodium chlorate and hydrochloric acid is usually used at present to carry out water treatment and disinfection, and there are following drawbacks when adopting this kind of mode to prepare chlorine dioxide and chlorine gas in the prior art: 1, main raw material sodium chlorate The conversion rate of chlorate is about 70%, which not only causes the preparation cost to increase, but also easily causes the chlorate in the treated water to exceed the standard; 2, the chlorine dioxide content is usually less than 50%, and the chlorine gas content is usually greater than 50%, and the disinfection effect is not good, resulting in There are many "three causes" substances

[0004] It can be seen that the existing technology for preparing chlorine dioxide has low chlorate conversion rate, low content of chlorine dioxide and high content of chlorine gas, resulting in high cost of water treatment and more disinfection by-products in the treated water In addition, even if the content of chlorine dioxide is increased, because it is easy to explode when the concentration of chlorine dioxide is greater than 10%, there will be safety problems when using

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