Method for producing chlorine dioxide with single-liquid electrolysis

Abstract

A method for producing chlorine dioxide with single-liquid electrolysis, wherein chlorine dioxide is generated by performing electrolysis by supplying a direct current to an electrolyte solution in a separating-membraneless electrolytic cell having a cathode and an anode, the method includes: (a) a step of generating chlorine dioxide by performing electrolysis by supplying the direct current to the electrolyte solution, which contains an alkali chloride, an alkali chlorite and a pH adjusting agent, wherein a pH of the electrolyte solution is 4 to 8; (b) a step of supplying a replenishing electrolyte solution, containing the alkali chloride, the alkali chlorite, and the pH adjusting agent, to the electrolytic cell during the electrolysis; and (c) a step of taking out the generated chlorine dioxide from the electrolyte solution.

1 . A method for producing chlorine dioxide with single-liquid electrolysis, wherein chlorine dioxide is generated by performing electrolysis by supplying a direct current to an electrolyte solution in a separating-membraneless electrolytic cell having a cathode and an anode, the method for producing chlorine dioxide comprising:
 (a) a step of generating chlorine dioxide by performing electrolysis by supplying the direct current to the electrolyte solution, which contains an alkali chloride, an alkali chlorite and a pH adjusting agent, wherein a pH of the electrolyte solution is 4 to 8;   (b) a step of supplying a replenishing electrolyte solution, containing the alkali chloride, the alkali chlorite, and the pH adjusting agent, to the electrolytic cell during the electrolysis; and   (c) a step of collecting the generated chlorine dioxide from the electrolyte solution.   
     
     
         2 . The method for producing chlorine dioxide according to  claim 1 , wherein the pH of the electrolyte solution is 5 to 7. 
     
     
         3 . The method for producing chlorine dioxide according to  claim 1 , wherein step (c) is performed by feeding air or an inert gas into the electrolyte solution and collecting the air or the inert gas coming out of the electrolyte solution. 
     
     
         4 . The method for producing chlorine dioxide according to  claim 1 , wherein the pH is made  4  to  8  by blending an acidic substance into the electrolyte solution, wherein the acidic substance is packaged separately and the blending of the acidic substance into the electrolyte solution is performed at the start of or immediately before the electrolysis. 
     
     
         5 . The method for producing chlorine dioxide according to  claim 2 , wherein step (c) is performed by feeding air or an inert gas into the electrolyte solution and collecting the air or the inert gas coming out of the electrolyte solution.