Mutual solubility between hexane and tri-<Emphasis Type="Italic">n</Emphasis>-butyl phosphate solvates of lanthanide(III) and thorium(IV) nitrates at various temperatures

The phase diagrams of binary liquid systems consisting of hexane and a tri-n-butyl phosphate (TBP) solvate of an Ln(III) (Ln = Nd, Gd, Y, Yb, Lu) or Th(IV) nitrate at various temperatures are considered. The diagrams show a field of homogeneous solutions and a two-phase field in which phase I is hexane-rich and phase II is rich in Ln(NO₃)₃(TBP)₃] or Th(NO₃)₄(TBP)₂]. The miscibility gap in the binary systems narrows with increasing temperature.