IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: 1-Proponal with Cyclohexane and Water

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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) Cyclohexane; C6H12; [110-82-7]  NIST Chemistry WebBook for detail

Original Measurements:
   Plackov, D.; Stern, I., Fluid. Phase Equilib. 71, 189 (1992).

Variables:
   Temperature = 298 K

Prepared By:
   A. Skrzecz

Experimental Data:   (Notes on the Nomenclature)
  

Compositions along the saturation curve

t/°C	T/K	Mass Fraction w1 (compiler)	Mass Fraction w2 (compiler)	Mole Fraction x1	Mole Fraction x2
25	298.2	0.0356	0.9631	0.0489	0.9452
25	298.2	0.1022	0.8918	0.1347	0.8391
25	298.2	0.1685	0.8179	0.2111	0.7319
25	298.2	0.2301	0.7460	0.2732	0.6324
25	298.2	0.3070	0.6533	0.3389	0.5149
25	298.2	0.3616	0.5841	0.3767	0.4345
25	298.2	0.4049	0.5261	0.4005	0.3716
25	298.2	0.4671	0.4377	0.4257	0.2848
25	298.2	0.4890	0.4038	0.4308	0.2540
25	298.2	0.5401	0.3138	0.4315	0.1790
25	298.2	0.5695	0.2408	0.4144	0.1251
25	298.2	0.5113	0.0801	0.2647	0.0296
25	298.2	0.4510	0.0523	0.2102	0.0174
25	298.2	0.3772	0.0303	0.1588	0.0091
25	298.2	0.3208	0.0153	0.1260	0.0043
25	298.2	0.2775	0.0082	0.1041	0.0022
25	298.2	0.2379	0.0039	0.0859	0.0010
25	298.2	0.2008	0.0024	0.0702	0.0006
25	298.2	0.1545	0.0017	0.0520	0.0004
25	298.2	0.0799	0.0009	0.0254	0.0002

Compositions of coexisting phases

t/°C	T/K	Mass Fraction w1 (compiler)	Mass Fraction w2 (compiler)	Mole Fraction x1	Mole Fraction x2	Comment(s)
25	298.2	0.053	0.945	0.072	0.918	hydrocarbon-rich phase
25	298.2	0.182	0.803	0.226	0.712	hydrocarbon-rich phase
25	298.2	0.345	0.608	0.368	0.464	hydrocarbon-rich phase
25	298.2	0.407	0.522	0.400	0.367	hydrocarbon-rich phase
25	298.2	0.444	0.468	0.414	0.312	hydrocarbon-rich phase
25	298.2	0.531	0.329	0.431	0.191	hydrocarbon-rich phase
25	298.2	0.534	0.067	0.279	0.025	hydrocarbon-rich phase
25	298.2	0.157	0.000	0.053	0.000	water-rich phase
25	298.2	0.199	0.008	0.070	0.002	water-rich phase
25	298.2	0.216	0.012	0.077	0.003	water-rich phase
25	298.2	0.218	0.012	0.078	0.003	water-rich phase
25	298.2	0.220	0.012	0.079	0.003	water-rich phase
25	298.2	0.231	0.015	0.084	0.004	water-rich phase
25	298.2	0.331	0.035	0.134	0.010	water-rich phase

Method/Apparatus/Procedure:
   Binodal compositions were determined by titration with the corresponding, less-soluble component until the appearance of turbidity.¹ The analytical method was used for determination of tie-lines. This was based on refractive indexes and densities of the samples,¹ combined with the oxidation of the alcohol with an excess of potassium dichromate and determination of unreduced dichromate with Na₂S ₂O₂. Alcohol in the organic layer was determined after extraction with water.

Source and Purity of Materials:
   (1) Kemika (Zagreb); analytical grade; presumably used as received; n=1.3828, p(25°C)=779.6 kg/m³, b.p.=96.8°C.
   (2) Zorka (Sabac); purity not specified; presumably used as received; n=1.4232, p(25°C)=773.6 kg/m³, b.p.=80.1°C.
   (3) Twice distilled in the presence of KMnO⁴.

Estimated Errors:
   Solubility: Not reported.
   Temperature: Composition <0.0005 mass fraction, binodal (relative); composition ±2%, tie line.

References:
   ¹ D. Plackov and I. Stern, Fluid Phase Equilib. 57, 327 (1990).

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Last updated: February 18, 2015 (Created: August 17, 2007)