A method for producing a strongly acidic, high-purity, free chlorine dioxide aqueous solution absorbing chlorine dioxide in strong acidification of a buffer solution

摘要

PURPOSE: The present invention relates to a method for producing an aqueous solution of high-purity high-purity free chlorine dioxide by absorbing chlorine dioxide in a simple and economical aqueous system consisting only of phosphate, carbonate and hydrogen peroxide under strong acidity of inorganic or organic acid until pH 1 to 4 And a method for producing a high-purity aqueous chlorine dioxide solution having a concentration of free chlorine dioxide of at most about 20,000 ppm or less.;In preparing an aqueous solution of activated chlorine dioxide, an aqueous solution of 1.0 to 10.0% by weight of sodium carbonate, 0.1 to 2.0% by weight of sodium phosphate dibasic and 0.1 to 3.0% by weight of hydrogen peroxide is added to the aqueous system with strong acidity of inorganic or organic acids and is absorbed until the pH becomes 1 to 4 to obtain a strongly acidic aqueous solution of high purity chlorine dioxide.