Chlorine dioxide prodn. from sodium chlorate - by reaction with hydrochloric acid, in satd. salt soln. (SW 19.9.77)

摘要

ClO2 is prepd. by reduction of sodium chlorate with HCl in aq. medium, at the b. pt. of the mixt. at a pressure below atmospheric. The reaction mixt. is satd. with NaCl at a H ion concn. of 0.05-0.3 V, at 30-85 degrees C and at a pressure of 20-400mgHg. When NaCl3 and HCl are reacted together two processes can occur simultaneously, NAClO3+2HCl right arrow ClO2 + 1/2HCl2 + H2O + NaCl (1) and NaClO3 + 6HCl right arrow 3Cl2+3H2O+NaCl (2). The above conditions favour the prodn. of ClO2 by (1) rather than (2).