抄録
In their previous paper (This Journal, 26, 205 (1972)), the authors reported the results of the determination that they carried out on the isotherm of the quinary system NaCl-KCl-MgCl2-CaCl2-H2O at 50°.
This paper is to report a study which was made on the equilibrium of the ternary systems NaCI-MgCl2-H2O, NaCl-CaCl2-H2O and the quaternary system NaCl-MgCl2-CaCl2-H2O at 75°. This study aimed at completing the equilibrium diagram of the five component system NaCl-KCl-MgCl2-CaCl2-H2O at 75°, which would be useful for the calculation of isothermal evaporation of natural gas brine, ion exchange membrane brine, etc. The data of isotherms were prepared by using the Seiko computer S. 301 and the HITAC 5020 E computer at the Computer Center of Tokyo University. The results of the study were as follows:
1. Isotherms of the ternary systems NaCI-MgCl2-H2O, NaCl-CaCl2-H2O and the quaternary system. NaCl-MgCl2-CaCl2-H2O were determined at 75°.
2. The isotherms thus obtained showed a fairly good analogy to those isotherms obtained at 50°, and proved reliable.
