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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:
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
0.343
0.020
0.115
0.006
25.0
298.2
0.388
0.029
0.138
0.009
25.0
298.2
0.476
0.048
0.192
0.017
25.0
298.2
0.555
0.075
0.259
0.031
25.0
298.2
0.614
0.155
0.361
0.080
25.0
298.2
0.596
0.255
0.416
0.157
25.0
298.2
0.541
0.361
0.429
0.252
25.0
298.2
0.469
0.469
0.411
0.362
25.0
298.2
0.384
0.576
0.364
0.481
25.0
298.2
0.293
0.685
0.297
0.612
25.0
298.2
0.199
0.791
0.212
0.744
25.0
298.2
0.100
0.897
0.110
0.873
25.0
298.2
0.050
0.949
0.056
0.938
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
0.351
0.616
0.342
0.528
hydrocarbon-rich phase
25.0
298.2
0.459
0.480
0.405
0.373
hydrocarbon-rich phase
25.0
298.2
0.549
0.348
0.429
0.240
hydrocarbon-rich phase
25.0
298.2
0.609
0.285
0.396
0.121
hydrocarbon-rich phase
25.0
298.2
0.567
0.353
0.275
0.038
hydrocarbon-rich phase
25.0
298.2
0.206
0.012
0.060
0.003
water-rich phase
25.0
298.2
0.240
0.011
0.072
0.003
water-rich phase
25.0
298.2
0.260
0.015
0.080
0.004
water-rich phase
25.0
298.2
0.285
0.018
0.090
0.005
water-rich phase
25.0
298.2
0.353
0.023
0.120
0.007
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; distilled by addition of anhydrous K
2
CO
3
, 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. Wootten, B. Shuttleworth, and C. Heyward, J. Chem. Thermodyn. 18, 1037 (1986).
2
S. W. Briggs and F. 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).