Investigation of polytherm solubility of system components sodium hypochlorite–potassium chloride–water

The results of studying the solubility in the system of sodium hypochlorite–potassium chloride–water in the temperature ranges from –22.8 to 60.0 °C using the visual-polythermal method are presented. On the solubility diagram constructed from experimental data, the fields of ice crystallization, KCl ∙ H2O, KCl are delineated; NaClO ∙ 5H2O; NaClO ∙ 2.5H2O, as well as KClO3. These fields converge at five triple invariant points of coexistence of three different solid phases. For these figurative points, the compositions of the equilibrium solution and the corresponding crystallization temperatures are deter- mined. As a result of the study of the potassium chloride–sodium hypochlorite–water system, the formation of a new compound – potassium chlorate was established, which was identified by chemical and physicochemical analytical methods. The temperature and concentration limits of KClO3 release were determined. The compound KClO3 formed by the interaction of the initial components is less soluble in this system relative to its other components and the field of its crystallization occupies a significant part of the diagram. The results will serve as the theoretical basis for the creation of a new technology for the production of potassium chlorate using industrial wastes from chemical production.

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