Continuous prodn. of chlorine di:oxide - by redn. of chlorate ions with chloride in acid medium (SE 30.3.81)

摘要

Continuous method is described for prodn. of chlorine dioxide by reduction of chlorate ions with chloride ions in an acid medium resulting from the introduction into sodium chloride soln. of sodium chlorate and hydrochloric acid at boiling point under sub-atmospheric pressure. The products are a mixt. of ClO2, Cl and steam. The process comprises reacting at 30-85 deg.C and a pressure of 20-400mm Hg NaClO3 at least 75% saturation, the mole ratio of chlorate to chloride ions being 1-6:1. The true hydrogen ion concn. of the mixt. is 0.5-0.3N. A soluble Pd salt (chloride) is dissolved in the reaction medium as catalyst in an amount of 5-25mg/l. Improved yield is achieved with less catalyst than in prior art.