Abstract
In their previous papers3, 4) the authors determined the isotherms for the ternary systems NaCl-MgCl2-H2O, NaCl-CaCl2-H2O and the quarternary systems NaCl-MgCl2-CaCl2-H2O, NaCl-KCl-MgCl2-H2O, NaCl-KCl-CaCl2-H2O at 75°C for the purpose of obtaining the equilibrium diagram of the five component system NaCl-KCl-MgCl2-CaCl2-H2O at 75°C. The authors used the data found in the paper of Lightfoot et al. for the ternary systems KCl-MgCl2-H2O, KCl-CaCl2-H2O, MgCl2-CaCl2-H2O and for the quaternary system KCl-MgCl2-CaCl2-H2O. The results obtained were as follows:
1. The isotherms for the quinary system NaCl-KCl-MgCl2-CaCl2-H2O were determined at 75°C.
2. The isotherms for the quinary system NaCl-KCl-MgCl2-CaCl2-H2O at 75°C were found very similar to the isotherms for the quaternary system KCl-MgCl2-CaCl2-H2O at 75°C due to very low solubility of NaCl in the system.
3. The area of the field for stable existence of CaCl2·KCl, CaCl2·2H2O, Carnallite, Tachhydrite, MgCl2·6H2O was characterized by a little increase due to a rise in temperature.
4. The solubility of NaCl was found nearly doubled by comparison with that of 50°C in the field of stable existence of CaCl2·KCl and CaCl2·2H2O.
