Equilibria of Ternary system KCl-MgCl₂-H₂O and Quaternary System KCl-MgCl₂-CaCl₂-H₂O at 110°C

Studies of the Natural Gas Brine (Part 13)

Abstract

This report covers part of experiments which have been carried out to elucidate the foundamental properties of isotllermal evaporation at 110°C for the natural gas brine and the ion-exchange membrane brine. In these experiments, the isotherms and invariant pohlts at 110°C of the ternary system KCl-MgCl₂-H₂O and the quaternary system KCI-MgCl₂-CaCl₂-H₂O were obtained.
As are sult, it was found that for the ternary system KCI-MgCl₂-H₂O, the values of the isotherms became greater in similar formsas temperature rose, that is, at 50°C, 75°C, and 110°C, and that the values of potassium chloride and magnesium chloride of the invariant points were greater likewise.
In the case of the quaternary system KCl-MgCl₂-CaCl₂-H₂O, it was found that the values at the invariant points T, V, amd W for potassium chloride and magnesium chloride increased but thevalues for calcium chloride decreased. However, as for V at 75°C and U₁ and U₂ at 110°C, the value for potassium chloride proved to be decreased, whereas that for magnesium chloride proved to be increased. In the case of calcium chlofide, value at U₁ was decreased, and the value at U₂ was increased. As temperature rose, the crystallization region of the double salt CaCl₂·KCl became larger, where as that of MgCl₂·6H₂O was much smaller.