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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
1-Hexanol with Heptane and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) 1-Hexanol (hexyl alcohol); C6H14O; [111-27-3]
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
0.932
0.000
0.708
0.000
25
298.2
0.872
0.076
0.701
0.062
25
298.2
0.715
0.255
0.625
0.227
25
298.2
0.558
0.427
0.518
0.404
25
298.2
0.184
0.814
0.180
0.812
25
298.2
0.006
0.000
0.001
0.000
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
0.831
0.125
0.687
0.105
organic-rich phase
25
298.2
0.509
0.478
0.476
0.456
organic-rich phase
25
298.2
0.099
0.099
0.097
0.897
organic-rich phase
25
298.2
0.006
0.000
0.001
0.000
water-rich phase
25
298.2
0.006
0.000
0.001
0.000
water-rich phase
25
298.2
0.006
0.000
0.001
0.000
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 weighted mixture of the other two components in 100 mL long-neck flask until one drop (weighing less then 0.01 g) results 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 passes through the composition of the overall mixture.
Source and Purity of Materials:
(1) Fluka, puriss. Quality; dried with anhydrous potassium carbonate, filtered, 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 ±0.0005 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).