Abstract: A method for preparing high-purity chlorine dioxide by using methanol and hydrogen peroxide as a reducing agent includes injecting concentrated sulfuric acid and sodium chlorate solution into a generator system to form a reaction mother liquid. The method also includes adding the reducing agent into the reaction mother liquid to produce chlorine dioxide gas and by-product sodium sulfate. The method further includes cooling and absorbing the produced chlorine dioxide gas by 4-10° C. chilled water to obtain a chlorine dioxide aqueous solution. The by-product sodium sulfate is filtered, washed, and recycled.

Abstract: The invention discloses a method for preparing high-purity chlorine dioxide by using methanol and hydrogen peroxide as reducing agent. The method comprises: concentrated sulfuric acid and sodium chlorate solution are injected into the generator to form the reaction mother liquid. The reaction mother liquid shall be maintained a certain acidity, temperature and sodium chlorate content, and then it is reacted with the reducing agent (methanol and hydrogen peroxide) to produce chlorine dioxide gas and by-product sodium sulfate. The chlorine dioxide gas is cooled and absorbed by low temperature chilled water to obtain an aqueous solution of chlorine dioxide, and by-products are recycled.