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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
2-Propanol with Heptane and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) 2-Propanol (isopropanol, isopropyl alcohol); C3H8O; [67-63-0]
NIST Chemistry WebBook
for detail
(3) Heptane (n-heptane); C7H16; [142-82-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Letcher, T.M.; Wootton, S.; Shuttleworth, B.; Heyward, C., J. Chem. Thermodyn 18, 1037 (1986).
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
298.2
0.147
0.000
0.049
0.000
25
298.2
0.326
0.009
0.128
0.002
25
298.2
0.456
0.033
0.209
0.009
25
298.2
0.552
0.103
0.313
0.035
25
298.2
0.583
0.205
0.413
0.087
25
298.2
0.472
0.429
0.444
0.242
25
298.2
0.321
0.635
0.378
0.449
25
298.2
0.111
0.881
0.167
0.793
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
298.2
0.175
0.809
0.245
0.680
hydrocarbon-rich phase
25
298.2
0.102
0.893
0.155
0.817
hydrocarbon-rich phase
25
298.2
0.065
0.932
0.102
0.880
hydrocarbon-rich phase
25
298.2
0.522
0.062
0.268
0.019
water-rich phase
25
298.2
0.401
0.020
0.171
0.005
water-rich phase
25
298.2
0.286
0.009
0.108
0.002
water-rich phase
Method/Apparatus/Procedure:
The titration method, adapted from Ref. 1, was used to determine the coexistence curve. The third component was added from a weighted gas-tight syringe to a weighed mixture of the other two components in 100 mL long-neck flask until one drop (weighing less than 0.01 g) resulted in cloudiness. The flask was immersed in a well controlled water bath and shaken continuously. Refractive indexes of these mixtures were measured at 298.3 K to ensure that separation did not take place. Tie lines were determined from mixtures of known composition in the immiscible region. The flasks were shaken well and the phases allowed to separate. Refractive indexes of samples of both phases were measured and related to compositions on the coexistence curve. Each tie line was checked to ensure that it passed through the composition of the overall mixture.
Source and Purity of Materials:
(1) Aldrich, Gold label, 99.5 mole %; dried with potassium carbonate, distilled.
(2) Analytical Carbo Erba, purity 99.5 mole %; purified by passing through columns containing silica gel and basic alumina.
(3) De-ionized.
Estimated Errors:
Solubility: Not reported.
Temperature: Composition ±0.005 mole fraction for measured points, ±0.01 mole fraction for tie-lines extremities in the worst case (authors).
References:
1
S. W. Briggs and E. W. Comings, Ind. Eng. Chem. 35, 411 (1943).