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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ethanol with Cyclohexane and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) Cyclohexane; C6H12; [110-82-7]
NIST Chemistry WebBook
for detail
(3) Ethanol (ethyl alcohol); C2H6O; [64-17-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Letcher, T.M.; Siswana, P.; Radloff, S.E., S. Afr. J. Chem. 44, 118 (1991).
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 w
1
(compiler)
Mass Fraction w
2
(compiler)
Mole Fraction x
1
Mole Fraction x
2
25.0
298.2
0.000
0.000
0.000
0.000
25.0
298.2
0.300
0.004
0.144
0.001
25.0
298.2
0.399
0.004
0.207
0.001
25.0
298.2
0.494
0.013
0.280
0.004
25.0
298.2
0.583
0.029
0.366
0.010
25.0
298.2
0.657
0.062
0.466
0.024
25.0
298.2
0.673
0.075
0.495
0.030
25.0
298.2
0.683
0.174
0.597
0.083
25.0
298.2
0.634
0.272
0.621
0.146
25.0
298.2
0.568
0.367
0.607
0.215
25.0
298.2
0.477
0.478
0.560
0.307
25.0
298.2
0.387
0.581
0.492
0.404
25.0
298.2
0.294
0.685
0.406
0.518
25.0
298.2
0.197
0.791
0.298
0.655
25.0
298.2
0.099
0.896
0.165
0.815
25.0
298.2
0.051
0.947
0.088
0.903
25.0
298.2
0.0000
0.9998
0.000
0.999
Compositions of coexisting phases
t/°C
T/K
Mass Fraction w
1
(compiler)
Mass Fraction w
2
(compiler)
Mole Fraction x
1
Mole Fraction x
2
Comment(s)
25.0
298.2
0.004
0.995
0.008
0.990
hydrocarbon-rich phase
25.0
298.2
0.008
0.991
0.015
0.982
hydrocarbon-rich phase
25.0
298.2
0.016
0.984
0.028
0.970
hydrocarbon-rich phase
25.0
298.2
0.035
0.963
0.061
0.930
hydrocarbon-rich phase
25.0
298.2
0.081
0.915
0.137
0.845
hydrocarbon-rich phase
25.0
298.2
0.124
0.869
0.200
0.770
hydrocarbon-rich phase
25.0
298.2
0.496
0.013
0.282
0.004
water-rich phase
25.0
298.2
0.588
0.034
0.374
0.012
water-rich phase
25.0
298.2
0.658
0.064
0.469
0.025
water-rich phase
25.0
298.2
0.686
0.132
0.560
0.059
water-rich phase
25.0
298.2
0.635
0.271
0.621
0.145
water-rich phase
25.0
298.2
0.533
0.411
0.590
0.249
water-rich phase
Method/Apparatus/Procedure:
The points on the binodal curve were determined by the titration method, as described in Ref. 1. The formation of a cloudy mixture was observed visually on shaking after addition of a known mass of the third component; syringes were precisely weighed. Tie line compositions were determined by the refractive index method
2
, and a complementary method using the Karl Fischer titration
3
. Measurements were made at pressure of 94.7 kPa.
Source and Purity of Materials:
(1) Merck: AR grade; refluxed with Mg and I
2
, distilled; purity >99.9 mole % by glc.
(2) BDH; Gold label grade; used as received; purity >99.9 mole % by glc.
(3) Source not specified.
Estimated Errors:
Solubility: Not reported.
Temperature: Composition ±0.005 mole fraction (binodal curve), ±0.01 mole fraction (tie lines).
References:
1
T. M. Letcher, S. Wootton, B. Shuttleworth, and C. Heyward, J. Chem. Thermodyn. 18, 1037 (1986).
2
S. W. Briggs and E. W. Comings, Ind. Eng. Chem. 35, 411 (1943).
3
T. M. Letcher, P. Siswana, P. van der Watt, and S. Radloff, J. Chem. Thermodyn. 21, 1053 (1989).