Reaction equation from the visible, sodium chlorite and hydrochloric acid reaction of chlorine and the maximum theoretical conversion rate is only 80%, and reacts with chlorine chlorine the maximum theoretical conversion rate can reach 100%, thus greatly save sodium chlorite amount of raw materials. Because of the high price of sodium perchlorate in the first few years, the production cost of chlorine dioxide is higher, and the application is slow. However with the improvement of technology, sodium chlorite production cost is greatly decreased and market and 25% chlorite sodium solution is supplied, it is more economical and secure. The chlorine dioxide content in disinfectant produced by sodium perchlorate is high, and the content of chlorine dioxide is 90% more than that. The method has been widely used in developed countries.

2, process quality

　　　　　From reaction equation visible reaction with sodium chlorite into chlorine dioxide, chlorine free, thus greatly save the dosage of sodium chlorite feed, by-product gas potential is chlorine, the content is less than 5%, the other impurity ions in the design of the generator can be get good control. The conversion efficiency of two was more than 95%. The system has the advantages of simple process, no heating, easy operation and maintenance, and the purity of the product in the product is more than 95%. Foreign chlorine dioxide generator is using sodium chlorite process, because the process in the reaction column under negative pressure transient response completely, do not need hydrochloride in excess, possible by-products is chlorite ion (ClO2) and chlorate ions ClO3 because of high purity chlorine dioxide generator dosage is very low, so these by-products ion is not enough to affect human health.

3, process by-products

　　　　　A large number of studies have been carried out on the toxicity of chlorine dioxide (ClO2) and ClO2- and ClO3-, the toxicity of chlorine dioxide (). Sodium chlorate process due to the incomplete reaction, resulting in a large number of chlorate ions into the water, even if the dosage is low will make the water index is high, and the chlorine by-products with water organic reaction will produce carcinogenic organics such as chloroform, directly endangering the health.

　　　　　Through experimental determination of sodium chlorite process at the exit of the chlorine dioxide solution, the results show that the content of chlorite ion chlorite and chlorate ion ClO3 - very low chlorine dioxide purity above 95%. Therefore, in conventional water disinfection concentration range, they are not on the human body caused adverse effects, and through reasonable optimization can make their concentration in the water distribution system is reduced to the minimum concentration.

　　　　　Whether what kind of process, in the disinfection of drinking water require the purity of chlorine dioxide is higher than 90%, in the practical application to reduce and control such as chloroform carcinogenic organics generation; the United States Environmental Protection Agency (EPA) clear requirements the purity of chlorine dioxide generator for producing chlorine dioxide is at least more than 95%. In drinking water disinfection, high purity chlorine dioxide generator is more suitable for the compound chlorine dioxide generator.