Influence of temperature on phase separation in the ternary systems [Th(NO₃)₄(TBP)₂]-isooctane-third organic component

Abstract

The phase diagrams of ternary liquid systems (TLSs) [Th(NO₃)₄(TBP)₂]-isooctane-third organic component [n-butanol, isobutanol, n-octanol, n-decanol, cyclohexanol, toluene, o-xylene, CCl₄, CHCl₃, o-dichlorobenzene, TBP, and higher isomeric carboxylic acids (HICAs)] were studied in the temperature range 298.15–333.15 K. These diagrams contain the fields of homogeneous solutions and the field of separation into two liquid phases (I, II). Phases I is enriched in [Th(NO₃)₄(TBP)₂] and third component, and phase II is enriched in isooctane. With increasing temperature, the field of separation into two liquid phases contracts and the content of the third component in the critical points decreases. The compositions of ternary systems in the critical point depend on the kind of the third component. In phase separation, the third component is predominantly concentrated in phase I, in spite of the fact that the third component and isooctane have infinite mutual solubility at all the temperatures.