A survey of reported compositions along the saturation curve (sat), and compositions of coexisting phases in equilibrium (eq.) for the system 2-propanol-hexane-water is given in Table 61.

Saturation curve The system 2-propanol-hexane-water forms a miscibility gap of type 1. Compositions along the saturation curve was reported only in Ref. 1 at 298 K. Only one binary pair of components, hexane-water, is partially miscible. The data for this system were compiled and critically evaluated in a previously published SDS volume.³ The recommended values of mutual solubility of hexane-water system 298.2 K are x'₂=0.999 53 and x"₂=2.3·10^-6. Two compositions in equilibrium at 331.2 K² were reported to be binary mixtures (concentration of the third component became equal 0.0). It seems that the analytical method used (gic) did not detect low concentrations of water and therefore these data are treated as inaccurate.

Phases in equilibrium Compositions of coexisting phases in equilibrium for the ternary system 2-propanol-hexane-water were reported in both references. There is no distribution of alcohol between the phases at 298.2 K¹ (concentration of 2-propanol expressed in mole fractions is practically constant). Composition of a plait point obtained graphically by the authors of Ref. 1 is equal to x₁=0.416 and x₂=0.240. Equilibrium data at 298.2 K are in agreement with data on the saturation curve and are also consistent with other ternary systems 2-propanol-hydrocarbon-water reported in Ref. 1. The larger miscibility gap and different direction of tie lines at 331.2 K than those at 298.2 K further show that the data of Ref. 2 are inaccurate. The data of Vorobeva and Karapetyants¹ at 298.2 K are treated as tentative and they are presented in Fig. 31 .