The liquid chlorine which includes the sodium hypochlorite aqueous solution null bromine which can by the production method and the said production method of the sodium hypochlorite

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a sodium hypochlorite aqueous solution in which the concentration of bromate ions is low.;SOLUTION: The method for producing the sodium hypochlorite aqueous solution comprises a first step to obtain gaseous chlorine (A) by vaporizing the total amount of liquid chlorine (M) containing bromine, a second step to obtain liquid chlorine (B) by liquefying a part of gaseous chlorine (A), a third step to separate liquid chlorine (B) obtained in the second step and remaining gaseous chlorine (C) not liquefied and a fourth step to obtain the sodium hypochlorite aqueous solution by reacting gaseous chlorine (C) separated in the third step with a sodium hydroxide aqueous solution. It is characterized by that the concentration of BrO₃^- in the obtained sodium hypochlorite aqueous solution is less than 20 wppm in terms of an available chlorine concentration of 13.0%.;COPYRIGHT: (C)2009,JPO&INPIT