METHOD FOR PREPARING HIGH-PURITY CHLORINE DIOXIDE USING COMBINATION OF METHYL ALCOHOL AND HYDROGEN PEROXIDE AS REDUCING AGENT

• Main Authors: WANG, Shuangfei, ZHAN, Lei, XU, Cuisheng, LIU, Liangqing, LI, Zhongping, TAN, Lang, HUANG, Binggui
• Format: Patent
• Language: Chinese; English; French
• Published: 05.03.2020
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

Provided is a method for preparing high-purity chlorine dioxide using a combination of methyl alcohol and hydrogen peroxide as a reducing agent. The method comprises: injecting concentrated sulfuric acid and sodium chlorate solution into a generator to form a reaction mother solution, making the reaction mother solution maintain an acidity of 5.8-6.2N, a sodium chlorate content of 234-266 g/L and a temperature of 69-73℃; then adding a reducing agent from the combination of methyl alcohol and hydrogen peroxide for reaction to generate chlorine dioxide gas and by-product neutral mirabilite; and cooling the chlorine dioxide gas generated by reaction and then absorbing same with chilled water of 4-10℃ to obtain a chlorine dioxide aqueous solution, and at the same time, filtering, washing and recycling the by-product neutral mirabilite. Compared with only using methyl alcohol as a reducing agent, the method can reduce the chlorine gas content in chlorine dioxide by 60-70%, and can reduce the sulfuric acid consumpt