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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
2-Methyl-2-propanol with Cyclohexane and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) 2-Methyl-2-propanol (tert-butanol,tert-butyl alcohol); C4H10O; [75-65-0]
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. 57, 327 (1990).
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
Mass Fraction w
2
Mole Fraction x
1
(compiler)
Mole Fraction x
2
(compiler)
25.0
298.15
0.0749
0.9218
0.0832
0.9018
25.0
298.15
0.1570
0.8359
0.1702
0.7982
25.0
298.15
0.2224
0.7631
0.2321
0.7045
25.0
298.15
0.3032
0.6716
0.3036
0.5923
25.0
298.15
0.3886
0.5696
0.3658
0.4723
25.0
298.15
0.4696
0.4633
0.4071
0.3537
25.0
298.15
0.5277
0.3771
0.4217
0.2654
25.0
298.15
0.5757
0.2904
0.4164
0.1850
25.0
298.15
0.6432
0.1270
0.3783
0.0658
25.0
298.15
0.5783
0.0993
0.2903
0.0439
25.0
298.15
0.5090
0.0594
0.2178
0.0224
25.0
298.15
0.4513
0.0415
0.1753
0.0142
25.0
298.15
0.3819
0.0246
0.1342
0.0076
25.0
298.15
0.3171
0.0123
0.1027
0.0035
25.0
298.15
0.2443
0.0038
0.0731
0.0010
25.0
298.15
0.2074
0.0016
0.0599
0.0004
25.0
298.15
0.1809
0.0012
0.0510
0.0003
25.0
298.15
0.1639
0.0008
0.0455
0.0002
25.0
298.15
0.0832
0.0009
0.0216
0.0002
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)
25.00
298.15
0.021
0.978
0.024
0.972
hydrocarbon-rich phase
25.00
298.15
0.113
0.881
0.124
0.851
hydrocarbon-rich phase
25.00
298.15
0.219
0.769
0.231
0.715
hydrocarbon-rich phase
25.00
298.15
0.343
0.624
0.334
0.535
hydrocarbon-rich phase
25.00
298.15
0.426
0.517
0.383
0.409
hydrocarbon-rich phase
25.00
298.15
0.578
0.292
0.422
0.188
hydrocarbon-rich phase
25.00
298.15
0.572
0.290
0.410
0.183
hydrocarbon-rich phase
25.00
298.15
0.092
0.000
0.024
0.000
water-rich phase
25.00
298.15
0.140
0.000
0.038
0.000
water-rich phase
25.00
298.15
0.168
0.004
0.047
0.001
water-rich phase
25.00
298.15
0.187
0.004
0.053
0.001
water-rich phase
25.00
298.15
0.193
0.004
0.055
0.001
water-rich phase
25.00
298.15
0.204
0.004
0.059
0.001
water-rich phase
25.00
298.15
0.219
0.004
0.064
0.001
water-rich phase
Method/Apparatus/Procedure:
The titration method, as reported in Ref. 1, was used to determine the solubility curve. Mixtures of known composition, mixed by means of a magnetic stirrer and placed in the thermostated double-wall Erlenmeyer flask, we titrated with the less soluble component until the appearance of turbidity. The analytical method was used to determine liquid-liquid equilibra. The mixture was shaken for at least 20 min. Equilibration took place in a thermostated double-walled separatory funnel of 250 mL over 2 h. The refractive index and density of both phases were measured. The composition was calculated numerically from the calibration data by polynomial regression analysis. The third order polynomials were used. Each experiment was repeated three times.
Source and Purity of Materials:
(1) Merck, analytical grade, used as received; n=1.3847, b.p.=99.3°C.
(2) Kemika (Zagreb), analytical grade; used as received; n=1.4232, p(25°C)=773.6 kg m
-3
, b.p.=80.0°C.
(3) Double distilled in the presence of KMnO
4
.
Estimated Errors:
Solubility: Not reported.
Temperature: Temp. ±0.02°C; composition <±0.05% (by mass) relative error.
References:
1
E. R. Washburn, C. L. Graham, G. B. Arnold, and L. F. Transuel, J. Am. Chem. Soc. 62, 1454 (1940).