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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
1-Proponal with Octane (n-octane) and Water
Components:
(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
Evaluator:
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
"
2
1.1·10
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
k
Pa 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
x
1
=0.449 and
x
2
=0318 and at 355.7 K
x
1
=0.540 and
x
2
=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
Author
T/K
DataType
Reference
Vorobeva and Karapetyants, 1967
298
sat. (16), eq. (11)
1
Timofeev
et al
., 1975
355-356
eq. (5)
2
View Figure 1 for this Evaluation
Notes:
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).