A survey of reported compositions along the saturation curve (sat), and compositions of coexisting phases in equilibrium (eq.) for the system 1-propanol-octane-water is given in Table 52.

Saturation curve The system 1-propanol-octane-water forms a miscibility gap of type 1. Only one binary pair of components, octane-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 octaine-water at 298.2 K are: x"₂1.1·10^-7 and x'₂=0.9994. The solubility of water in octane reported in Ref. 1 at 0.001 mass fraction (equivalent to 0.006 mole fraction) is rejected because it is inconsistent with recommended value.³ Compositions along the saturation curve obtained by the titration method as well as compositions of phases in equilibrium are consistent at 298.2 K.¹ Data reported by Timofeev et al.² at very difficult experiments as vapor-liquid-liquid equilibria at 101.3 kPa and at boiling temperatures 354.7-355.7 K, present a larger miscibility gap than at 298 K, which indicates error in the experimental method. However they are consistent within the data set. On the other hand, the data for the 1-propanol-octane-water system are consistent with the data for the 1-propanol-nonane-water system measured and reported by Vorobeva and Karrapetyants in the same paper.¹

Phases in equilibrium Compositions of coexisting phases in equilibrium for the ternary system 1-propanol-octane-water were reported in both references. Composition of each phase was calculated from the density - composition curve of saturated mixtures prepared at the time of saturation curve measurements. Compositions of phases in equilibrium reported in Ref. 2 were measured only at boiling temperatures and detailed information about experimental procedures are not reported. Plait points were reported in both cases; at 298.2 K it is x₁=0.449 and x₂=0318 and at 355.7 K-x₁=0.540 and x₂=0.310. All experimental data are treated as tentative. To present system behavior, the data at 298.2 K of Vorobeva and Karapetyant,¹ are presented in Fig. 26 .