Startup method for electrolytic sulfuric acid solution manufacturing system

Abstract

Hydrogen peroxide water and, if necessary, sulfuric acid and/or water, are added to a sulfuric acid solution in a storage tank of an electrolytic sulfuric acid solution manufacturing system to enhance the oxidizing power of the sulfuric acid solution supplied to an electrolytic cell to perform electrolysis. The manufacturing system starts up during an initial operation after completion of the system, or after replacement of a sulfuric acid-containing solution in the system, or during an operation after the concentration of a persulfuric acid component in the sulfuric acid solution stored in the system decreases due to shutdown of the system, or other similar situations. By starting up the manufacturing system in this manner, the startup of the system, which manufactures an electrolytic sulfuric acid solution containing a persulfuric acid component generated by electrolyzing sulfuric acid, can be completed in a short time, and the energy consumption can be reduced.

1 . A method for starting up an electrolytic sulfuric acid solution manufacturing system for manufacturing an oxidizing solution containing a persulfuric acid component generated by electrolyzing a solution composed mainly of a sulfuric acid component, the method comprising:
 adding hydrogen peroxide water to all or part of the solution composed mainly of the sulfuric acid component present in the system to enhance oxidizing power of the solution; and   supplying the solution to an electrolytic cell to perform electrolysis.   
     
     
         2 . The method according to  claim 1 , wherein startup of the system takes place either during an initial operation after completion of the system, or after replacement of the oxidizing solution containing the persulfuric acid component in the system, or during an operation after the concentration of the persulfuric acid component in the oxidizing solution stored in the system decreases due to shutdown of the system. 
     
     
         3 . The method according to  claim 1 , further comprising
 adding sulfuric acid and/or water to all or part of the solution composed mainly of the sulfuric acid component present in the system.   
     
     
         4 . The method according to  claim 3 , comprising:
 adding the hydrogen peroxide water, sulfuric acid, and/or water in response to a measured value of a sulfuric acid concentration and/or a persulfuric acid concentration in the solution composed mainly of the sulfuric acid component;   electrolyzing the solution in response to the measured value of each concentration so that the persulfuric acid concentration reaches a target value; and   heating or cooling the solution in response to a measured value of a temperature of the oxidizing solution so that the temperature reaches a target value.   
     
     
         5 . The method according to  claim 3 , wherein the system comprises:
 a storage tank that stores the oxidizing solution;   an electrolytic cell that processes the oxidizing solution;   a circulation pipe provided with a liquid feed mechanism for circulating the solution between the storage tank and the electrolytic cell;   a control mechanism that controls temperature of the oxidizing solution in the storage tank and/or temperature of the solution supplied to the electrolytic cell;   a hydrogen peroxide addition mechanism; and   an addition mechanism for sulfuric acid and/or water.