Research On New Technology Of Preparation Of Effeicent Disinfectant, Chlorine Dioxide

Chlorine dioxide is the optimum disinfectant to be used at present, which is called the fourth generation disinfectant from abroad and defined as the A1 disinfectant by WHO. It is extensively applied to the aspects of disinfections, drinking water, hospital sewage, food antisepsis and retaining freshness. The medical application is also beginning studying and there are medical application reported. Chlorine dioxide is becoming the first disinfectant. The preparations of chlorine dioxide includes many methods, such as preparations using excess HC1 with ClO3-reacting NaCl with ClO3- in a strong H2SO4 solon and manufacturing by methyl alcohol. The preparation using methyl alcohol is the optimized method at present. In the research of recent years, chlorine dioxide generator has been developed. But new method has seldom been reported. The article introduces a new process in preparation of chlorine dioxide by reducing sodium chlorate in acid aqueous solution with pyrite. On the basis of experiments ,the optimized condition are obtained: reacting temperature:30 C , the sodium chlorate concentration:3mol/L, the sulfuric acid concentration:7mol/L,the surplus rate of pyrite: 5%. The rate of production is 90.31%. The rate of purity is 91.57%. The method using pyrite is proved to be practicable and the new device is devised.Chlorine dioxide is sensitive to light and heat. It will decompose, Cl2O6 is mainly got at low temperature, Cl2 and O2 are products at high temperature. The quantity of ClO2 has decreased by 25% in 56 days in the experiment. It proves that the ClO2 solution is unstable. The present chlorine dioxide products are mainly the stable ClO2 aqueous solution and solid chlorine dioxide. The stable CIO2 aqueous solution is widely used in practice, and the stable chlorine dioxide referred usually is the stable ClO2 aqueous solution.In the experiment, Na2CO3 and H2O2 are used as stabilizer and the proper proportion of stabilizer is 2:3(mol%). By the test, the stable chlorine dioxide meets the standardization.