IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: 1-Proponal with Octane (n-octane) and Water

   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 1-Proponal (n-propanol, propyl alcohol, n-propyl alcohol); C3H8O; [71-23-8]  NIST Chemistry WebBook for detail
   (3) Octane (n-octane); C8H18; [111-65-9]  NIST Chemistry WebBook for detail

   A. Skrzecz, Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland (1996.05)

Critical Evaluation:

      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 .

Experimental Data:   (Notes on the Nomenclature)

TABLE 52. Summary of experimental data for the system 1-propanol-octane-water
Vorobeva and Karapetyants, 1967298sat. (16), eq. (11)1
Timofeev et al., 1975355-356eq. (5)2
View Figure 1 for this Evaluation

Table 52  Number of experimental points in parentheses.

References: (Click a link to see its experimental data associated with the reference)

   1  Vorobeva, A.I.; Karapetyants, M., Kh., Zh. Fiz. Khim. 41, 1144 (1967).
   2  Timofeev, V.S.; Aristovich, V.Yu.; Sabylin, I.I.; Koshel'kov, V.A.; Pavlenko, T.G.; Serafimov, L. A., Izv. Vyssh, Uchebn. Zaved., Khim. Khim. Tekhnol. 18, 1219 (1975).
   3  Shaw, D.G., ed., Solubility Data Series, Vol. 37, Hydrocarbons with Water and Seawater, Part I: Hydrocarbons C8 to C36 (Pergamon, New York, 1989).