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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
2-Butanol with Benzene 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) Benzene; C6H6; [71-43-2]
NIST Chemistry WebBook
for detail
Original Measurements:
Davis, J.R.; Evans, L.R., J.Chem. Eng. Data 5, 401 (1960).
Variables:
Temperature = 303 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)
30.0
303.15
0.0311
0.9678
0.0326
0.9627
30.0
303.15
0.0580
0.9403
0.0606
0.9321
30.0
303.15
0.0991
0.8966
0.1024
0.8793
30.0
303.15
0.1961
0.7935
0.1977
0.7591
30.0
303.15
0.2964
0.6912
0.2954
0.6537
30.0
303.15
0.3887
0.5841
0.3685
0.5254
30.0
303.15
0.4760
0.4752
0.4221
0.3999
30.0
303.15
0.5665
0.3602
0.4682
0.2825
30.0
303.15
0.6285
0.2794
0.4939
0.2083
30.0
303.15
0.6992
0.1691
0.4989
0.1145
30.0
303.15
0.7187
0.0616
0.4275
0.0348
30.0
303.15
0.1180
0.0006
0.0315
0.0002
30.0
303.15
0.0783
0.0006
0.0202
0.0001
30.0
303.15
0.0407
0.0007
0.0102
0.0002
30.0
303.15
0.0186
0.0012
0.0046
0.0003
30.0
303.15
0.6650
0.0000
0.3254
0.0000
30.0
303.15
0.1523
0.0000
0.0418
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)
30.0
303.15
0.0154
0.9835
0.0162
0.9791
organic-rich phase
30.0
303.15
0.0881
0.9079
0.0912
0.8918
organic-rich phase
30.0
303.15
0.1940
0.7961
0.1959
0.7629
organic-rich phase
30.0
303.15
0.2898
0.6970
0.2882
0.6578
organic-rich phase
30.0
303.15
0.3776
0.5970
0.3601
0.5402
organic-rich phase
30.0
303.15
0.4827
0.4669
0.4260
0.3910
organic-rich phase
30.0
303.15
0.5617
0.3668
0.4666
0.2891
organic-rich phase
30.0
303.15
0.6271
0.2741
0.4847
0.2010
organic-rich phase
30.0
303.15
0.7003
0.1655
0.4968
0.1114
organic-rich phase
30.0
303.15
0.7182
0.0569
0.4231
0.0318
organic-rich phase
30.0
303.15
0.0218
0.0008
0.0054
0.0002
water-rich phase
30.0
303.15
0.0530
0.0008
0.0134
0.0002
water-rich phase
30.0
303.15
0.0690
0.0006
0.0177
0.0001
water-rich phase
30.0
303.15
0.0781
0.0006
0.0202
0.0001
water-rich phase
30.0
303.15
0.0849
0.0004
0.0221
0.0001
water-rich phase
30.0
303.15
0.0978
0.0005
0.0257
0.0001
water-rich phase
30.0
303.15
0.0999
0.0005
0.0263
0.0001
water-rich phase
30.0
303.15
0.1028
0.0004
0.0271
0.0001
water-rich phase
30.0
303.15
0.1154
0.0005
0.0307
0.0001
water-rich phase
30.0
303.15
0.1347
0.0003
0.0365
0.0001
water-rich phase
Method/Apparatus/Procedure:
The solubilities and tie lines were measured in 25 mL glass-stoppered flasks, mounted in an air-shaker and immersed in a constant temperature bath by titration of weighed mixtures to the appearance of a permanent second phase. The third component was added by hypodermic syringe. Drops were 2-3 mg. The experimental results were accepted when the loss of vapors was smaller than 17 mg (about 0.2% of the total volume). Refractive indexes of the saturation solutions were measured at 30 °C by an Abbe 3 L refractometer and plotted as a concentration function for each component. The tie lines were determined by adding alcohol to binary benzene-water mixtures. After separation, refraction indexes were measured for each phase and the concentrations were read from prepared plots. The sum of calculated concentration was always 1,000 ±0.001 of mass fraction.
Source and Purity of Materials:
(1) Matheson Co.; dried over Na, distilled; n(20°C)=0.8050.
(2) Source not specified; dried over Na, distilled; n(20°C)=1.5001, d(20°C)=0.8795.
(3) De-ionized, distilled from KMnO
4
; n(20°C)=1.3343, d(20°C)=0.9979.
Estimated Errors:
Solubility: Not reported.
Temperature: Bath temp. ±0.05°C (solubility), ±0.02°C (tie line).