IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 1-Propanol with heptane 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) Heptane (n-heptane); C7H16; [142-82-5]  NIST Chemistry WebBook for detail

Original Measurements:
   McCants, J.F.; Jones, J.H.; Hopson, W.H., Ind. Eng. Chem. 1953, 45, 454-6.

Variables:
   Temperature = 311 K

Prepared By:
   A. Skrzecz

Experimental Data:   (Notes on the Nomenclature)

Compositions along the saturation curve
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)
100	310.9	0.000	0.999	0.0000	0.9945
100	310.9	0.161	0.824	0.2283	0.7007
100	310.9	0.241	0.730	0.3107	0.5645
100	310.9	0.305	0.649	0.3598	0.4592
100	310.9	0.410	0.501	0.4070	0.2983
100	310.9	0.478	0.406	0.4312	0.2197
100	310.9	0.550	0.281	0.4289	0.1314
100	310.9	0.574	0.214	0.4072	0.0911
100	310.9	0.556	0.118	0.3243	0.0413
100	310.9	0.518	0.073	0.2689	0.0227
100	310.9	0.414	0.035	0.1821	0.0092
100	310.9	0.308	0.013	0.1193	0.0030
100	310.9	0.253	0.007	0.0928	0.0015
100	310.9	0.135	0.003	0.0448	0.0006
100	310.9	0.000	0.001	0.0000	0.0002

Compositions of coexisting phases
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)	Comment(s)
100	310.9	0.138	0.839	0.1922	0.7009	hydrocarbon-rich phase
100	310.9	0.261	0.702	0.3240	0.5227	hydrocarbon-rich phase
100	310.9	0.240	0.728	0.3064	0.5574	hydrocarbon-rich phase
100	310.9	0.131	0.857	0.1912	0.7503	hydrocarbon-rich phase
100	310.9	0.357	0.010	0.1443	0.0024	water-rich phase
100	310.9	0.500	0.069a)	0.2526	0.0209	water-rich phase
100	310.9	0.485	0.062b)	0.2385	0.0183	water-rich phase
100	310.9	0.243	0.006c)	0.0883	0.0013	water-rich phase

Notes:
   ^a  See Method.
   ^b  See Method.

Method/Apparatus/Procedure:
   The titration method was used to obtain binodal curve. The samples of homogeneous binary mixture were placed in a constant temperature bath and titrated the third component to the cloud point. Each sample was agitated in the constant temperature bath for several minutes between drops of the third component. The temperatures of these systems were raised slightly (1°F) to obtain homogeneity and their refractive indexes were measured. The analytical method was used for tie lines. (a) A ternary mixture of known composition was shaken for several hours in constant temperature bath and after both phases were carefully seperated and their refractive indexes were determined. The intersections of the tie lines with the binodal curve were determined by refractive index interpolation between points of known composition used to determine the curve.

(b) The slopes of the tie lines were checked by determining tie lines by the graphical application of the lever rule as described in Ref. 1.

(c) The two phases were analyzed chemically for one or two components.

Source and Purity of Materials:
   (1) Du Pont, refined; used as received; n(20°C,D)=1.3855, d(75°F,60°F)=0.800.
   (2) Phillips, pure grade; used as received; n(20°C,D)=1.3974, d(75°F,60°F)=0.680.
   (3) Distilled; n(20°C,D)=1.3330.

Estimated Errors:
   Solubility: Not reported.
   Temperature: refractive index ±0.0001; concentration ±0.001 mass % (estimated by compiler).

References:
   ¹ D. F. Othmer and P. E. Tobias, Ind. Eng. Chem. 34, 690 (1942).