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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
2-Butanol with Toulene and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) 2-Butanol (sec-butanol, sec-butyl alcohol, (RS)-2-butanol, dl-2-butanol, DL-2-butanol); C4H10O; [78-92-2]
NIST Chemistry WebBook
for detail
(3) Toluene (methylbenzene); C7H8; [108-88-3]
NIST Chemistry WebBook
for detail
Original Measurements:
Evans, L.R.; Lin, J.S., J. Chem. Eng. Data 13, 14 (1968).
Variables:
Temperature = 295 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
0.0507
0.9469
0.0617
0.9263
25.0
298.15
0.1075
0.8858
0.1268
0.8407
25.0
298.15
0.1714
0.8189
0.1970
0.7571
25.0
298.15
0.3032
0.6734
0.3221
0.5756
25.0
298.15
0.3529
0.6153
0.3606
0.5057
25.0
298.15
0.3985
0.5616
0.3928
0.4453
25.0
298.15
0.4742
0.4709
0.4395
0.3511
25.0
298.15
0.5588
0.3614
0.4744
0.2468
25.0
298.15
0.5705
0.3439
0.4757
0.2307
25.0
298.15
0.6260
0.2650
0.4862
0.1656
25.0
298.15
0.6784
0.1740
0.4758
0.0982
25.0
298.15
0.7068
0.0940
0.4412
0.0472
25.0
298.15
0.7104
0.0667
0.4226
0.0319
25.0
298.15
0.7097
0.0611
0.4170
0.0289
25.0
298.15
0.7061
0.0434
0.3985
0.0197
25.0
298.15
0.6710
0.0090
0.3364
0.0036
25.0
298.15
0.1541
0.0000
0.0424
0.0000
25.0
298.15
0.1044
0.0000
0.0276
0.0000
25.0
298.15
0.0696
0.0000
0.0179
0.0000
25.0
298.15
0.0251
0.0000
0.0062
0.0000
Compositions of coexisting phases
t/°C
T/K
Mass Fraction w
1
Mass Fraction w
2
Mole Fraction x
1
(compiler)
Mole Fraction x
2
(compiler)
Comment(s)
25.0
298.15
0.0700
0.9270
0.0845
0.9006
organic-rich phase
25.0
298.15
0.3035
0.6729
0.3222
0.5747
organic-rich phase
25.0
298.15
0.5570
0.3645
0.4748
0.2499
organic-rich phase
25.0
298.15
0.6336
0.2520
0.4848
0.1551
organic-rich phase
25.0
298.15
0.7095
0.0815
0.4340
0.0401
organic-rich phase
25.0
298.15
0.0650
0.0000
0.0166
0.0000
water-rich phase
25.0
298.15
0.0970
0.0000
0.0254
0.0000
water-rich phase
25.0
298.15
0.1141
0.0001
0.0304
0.0000
water-rich phase
25.0
298.15
0.1235
0.0000
0.0331
0.0000
water-rich phase
25.0
298.15
0.1457
0.0000
0.0398
0.0000
water-rich phase
Method/Apparatus/Procedure:
Solubilities and tie lines were measured in 50 mL glass-stoppered flasks, mounted in a motor-driven shaker and immersed in a constant temperature bath. To obtain solubility's, the weighed mixtures were titrated to the appearance of a permanent second phase. The third component was added by hypodermic syringe in drops of about 4 mg. Equilibrium was reached when the second phase persisted after 1 h shaking in the bath. The evaporation loss was about 20 mg (0.1%-0.2% of the total solution). Refractive indexes of the saturated solutions were measured at 20°C with a Bausch and Lomb 3 L refractometer and plotted as a concentration function for each component. The tie lines were determined by shaking three-component mixtures of known composition in a constant temperature bath for 6 h. After separation, refractive indexes were measured for each phase and the concentrations were read from prepared plots. The sum of calculated concentrations was always 1.000±0.001 when expressed as mass fraction. The procedure was the same as in Ref. 1.
Source and Purity of Materials:
(1) Eastman Kodak Co.; treated with MgSO
4
, dried over Na, distilled; n(20°C)=1.3973, d(20°C)=0.8059.
(2) J. T. Barker Chemical Co.; dried over Na, distilled; n(20°C)=1.4963, d(20°C)=0.8667.
(3) De-ionized, distilled from KMnO
4
; n(20°C)=1.3324, d(20°C)=0.9983.
Estimated Errors:
Solubility: Not reported.
Temperature: Bath temp. ±0.05°C (solubility).
References:
1
J. R. Davis and L. R. Evans, J. Chem. Eng. Data 5, 401 (1960).