Method for preparing high-purity chlorine dioxide by using starchiness raw material and method for preparing catalyst used therein

Abstract

The invention discloses a method adopting starchiness material to prepare high-pure chlorine dioxide. Dried starchiness material and catalyst are added into the sodium chlorate solution and the mass ratio between the sodium chlorate, starchiness material and catalyst is controlled to be 1:0.80-1.40:0.01-0.1; then the reaction system is heated to 50 to 70 DEG C and then the sulfuric acid of 1 / 1 isslowly added into the mixture while stirring and the reaction temperature is controlled to be 50 to 90 DEG C and the concentration of the sulfuric acid in the system is 4.5 to 8.0mol / L and then the chlorine dioxide is guided out under the negative pressure; and the catalyst is the complex-type ammonium citrate vanadyl. The reaction condition is gentle and the reaction speed is quick; the reactionis also stable and safe; the operation is convenient; the productivity of chlorine dioxide is high, the purity is high; and the manufacturing cost is low.

Description

technical field [0001] The invention relates to the technical field of preparation of disinfectant compounds, in particular to a method for preparing high-purity chlorine dioxide by reducing sodium chlorate with starch under the action of a catalyst and a preparation method of the catalyst used. Background technique [0002] Chlorine dioxide has strong oxidizing properties. Calculated by available chlorine, it is 2.5 times that of chlorine gas. It is known as a high-efficiency, broad-spectrum sterilizing disinfectant. The World Health Organization (WHO) recommends it as an A1-level safe disinfectant. It is widely used in sterilization, anti-corrosion and deodorization, preservation, environmental pollution treatment, fabric and pulp bleaching, etc. Chlorine dioxide has been widely used in drinking water, wastewater treatment and public places in developed countries such as the United States, Western Europe and Japan. Sterilization, preservation of food, meat, fruits and vege...

AI Technical Summary

Problems solved by technology

The disadvantages of these methods are high production costs and low purity of chlorine dioxide (often containing chlorine gas)

In recent years, there have been some reports on the preparation of high-purity chlorine dioxide. For example, reports such as Li Ruizhen (Journal of Qiongzhou University, 2003, 10 (2) 15-17) dissolved sodium chlorate in a certain concentration of sulfuric acid solution. To prepare high-purity chlorine dioxide, the catalyst is to dissolve three kinds of transition metal oxides in hydrochloric acid, add n-butanol, and use a dry porcelain tube for adsorption treatment, and then add the catalyst-adsorbed porcelain tube to the reaction solution at a certain temperature to prepare chlorine dioxide Oxidation of chlorine, the purity of chlorine dioxide reaches 98.4-99.8%; if no catalyst is used in this reaction, the reaction between sodium chlorate and sulfuric acid is difficult to control, and the yield of chlorine dioxide is low and the purity is poor; the preparation of porcelain tube adsorption catalyst is complicated , Blow out chlorine dioxide with nitrogen and absorb it with 5% KI solution, which will increase the production cost. This method can only be used as a research method and has no practical value

In the existing method for preparing chlorine dioxide, either the reaction speed is slow, or the reaction is violent and dangerous, not only the reaction conditions are difficult to control, but also the operation is complicated. The key is that the chlorine dioxide yield is low, the purity is poor, and the production cost is high. also higher