Solid-liquid phase equilibria in the ternary systems H₂O+ZnCl₂+NaCl at temperatures of 298, 313 and 333 K

In this study, an economic separation method is suggested with the use of phase equilibria in order to ensure the recycling of ZnCl₂, the industrial waste amount of which is very high, and to prevent it from an environmental pollutant. Sodium chloride-zinc chloride-water systems were examined by the isothermal method at temperatures of 298, 313 and 333 K. The analyses of the liquid and solid phases were used to determine the composition of the solid phase using the Schreinemaker's graphic method. The solid-liquid phase equilibrium and viscosity data belonging to all the ternary systems were identified and the solubility and viscosity changes with temperature were compared. The viscosity values were inversely proportional to the temperature as the amount of ZnCl₂ in the solution increased. NaCl, 2NaCl ZnCl₂ nH₂O (n: 2, 0), ZnCl₂ salts were observed at 298, 313 and 333 K in the solid phases that are in equilibrium with the liquid phase at the invariant point.