| 摘要 |
PROBLEM TO BE SOLVED: To stably produce a hypochlorite aqueous solution with specified pH effective as sterilization water than water, an alkali source and a chlorine source.SOLUTION: There is provided a method for producing a hypochlorite aqueous solution, comprising: a product storage step where a hypochlorite aqueous solution is stored in a storage tank 14; a hypochlorite aqueous solution preparation step including a circulation line 15 for circulating the hypochlorite aqueous solution stored in the storage tank at the outside of the storage tank, in which the circulation line is fed with the raw material so as to be mixed to prepare a hypochlorite aqueous solution; a vapor phase part removal step where extraction is performed to the hypochlorite aqueous solution flowing through the circulation line with a gas present at the vapor phase part of the storage tank by a gas extraction line 25 so as to be contacted; a product discharge step where a part of the hypochlorite aqueous solution in the storage tank or the circulation line is discharged to the outside from the discharge line 21; and a pH preparation step where the feed ratio of the raw material is controlled in such a manner that the pH of the hypochlorite aqueous solution to the discharge line reaches 4 to 7.SELECTED DRAWING: Figure 1 |
