| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing at a high yield a sodium hypochlorite aqueous solution having a low content of impurity such as chloric acid and sodium chloride.SOLUTION: A method for producing a low-salt sodium hypochlorite aqueous solution comprises steps of: (1) feeding a 30 to 60 mass% sodium hydroxide aqueous solution into a reaction vessel; (2) introducing a chlorine gas into the sodium hydroxide aqueous solution fed into the reaction vessel and carrying out a chlorination reaction in a temperature range of 20°C to 50°C; and (3) obtaining a sodium hypochlorite aqueous solution by separating and removing a by-product sodium chloride deposited in step (2) from the reaction liquid, and is characterized in that the step (2) is carried out while agitating under a condition in which the agitation power requirement per unit volume is 0.1 to 15 kW/mas well as a ratio of an agitation required power number Np to a circulation flow quantity number Nq (Np/Nq) is 0.5 to 8.</p> |
