Equilibriums of the Quinary Reciprocal System Na, K, Mg Cl, SO₄-H₂O

Abstract

The authors investigated data related to the solubility of oceanic salts containing NaCl mainlym Chemical Abstracts published from 1940 to 1970. As the result, they made out four newbles; namely, three four-component systems, Na, Mg Cl, SO₄-H₂O, Na, K Cl, SO₄-H₂O and Na, Mg Cl-H₂O and a five-component system, Na, K, Mg Cl, SO₄-H₂O. These tables represent thempositions of liquid phases and the kinds of solid phases on the mono-variant points saturatedth NaCl.
The authors made out of these data polythermic equilibrium diagrams within the temperaturege of 50°C to 110°C, partially modifying the diagrams shown in the classical work of D'Ans.
It was confirmed that the point of Y, at which four solid phases, namely, NaCl, loeweite (Na₂SO₄·MgSO₄·5/2H₂O), langbeinite (K₂SO₄·2MgSO₄) and kieserite (MgSO₄·H₂O) coexist, existed evenat 110°C, and the composition of liquid phase was extrapolated, namely, Na₂Cl₂ 23.9, K₂Cl₂ 11.1, MgCl₂ 32.0 and MgSO₄ 11.5 moles per 1000 moles of H₂O.