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 AI disinfectant by WHO. It is extensively applied to the aspects of disinfections, such as drinking water, hospital sewage, food antisepsis, making paper, retaining freshness, and so on. The medical application is also beginning studying and there have been medical applications reported. Chlorine dioxide is becoming the first disinfectant in daily life.There are many methods for the preparations of chlorine dioxide. They can be categorized two: electrolytic method and chemical method which is further classified oxidation process and reduction method. The preparation using methyl alcohol which is one of reduction method is the optimized method at present. So I also adopt this method on the experiment. In the industrial preparation of chlorine dioxide process, it is inevitable to bring the by-product—chlorine. This test studies the analysis method about the chlorine dioxide and chlorine in the mixed gas.Chlorine dioxide is high sensitive to light and heat. It will decompose. Cl₂O₆ is mainly got at low temperature, but Cl₂ and O₂ are products at high temperature. In the experiment, we prepared the solid sodium percarbonate dissolved it in water and then absorbed chlorine dioxide, finally the stable chlorine dioxide aqueous solution was gained. We put acid in the solution to make the pure Chlorine dioxide and saved it in the brown bottle so that we could see about the unstable chlorine dioxide solution reduction with time gone. At last we drew a conclusion chlorine dioxide got lost for its disproportionating decomposition after 12 days. It also told us the unstable chlorine dioxide solution wasn't compatible to commercial storage and transportation. So the stability about the chlorine dioxide becomes one of the key problems about broadening the range of uses and strengthening the effect of use. In the present stable chlorine dioxide, there are many product forms which can be categorized liquid state and solid state according to their existing state. This article introduces a new process in preparation of solid stable chlorine dioxide which uses silicate and hydrogen peroxide as the basic ingredients, absorbs the chlorine dioxide gas and then it appears colloid stable chlorine dioxide, finally dry it and then get the solid stable chlorine dioxide. This article also discusses the preparation condition and test it's stability by iodometric method.