Home
Introduction
Search Menu
IUPAC Series (PDF)
Reference
Version History
About the Project
Disclaimer
Contact Us
Acknowledgements
IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
1-Pentanol with Heptane and Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) 1-Pentanol (pentyl alcohol, amyl alcohol, n-amyl alcohol); C5H12O; [71-41-0]
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
0.919
0.000
0.699
0.000
25
298.2
0.861
0.079
0.703
0.057
25
298.2
0.791
0.168
0.694
0.130
25
298.2
0.691
0.280
0.640
0.228
25
298.2
0.600
0.380
0.581
0.324
25
298.2
0.486
0.503
0.495
0.450
25
298.2
0.297
0.698
0.318
0.656
25
298.2
0.099
0.900
0.110
0.884
25
298.2
0.019
0.000
0.004
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
0.691
0.280
0.640
0.228
organic-rich phase
25
298.2
0.351
0.642
0.370
0.595
organic-rich phase
25
298.2
0.099
0.900
0.111
0.884
organic-rich phase
25
298.2
0.019
0.000
0.004
0.000
water-rich phase
25
298.2
0.015
0.000
0.003
0.000
water-rich phase
25
298.2
0.010
0.000
0.002
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 cm
3
long-neck flask until one drop (weighing less then 0.01 g) results cloudiness. The flask was immersed in a well controlled water bath and shaken continuously. Refractive indexes of these mixtures were measured at temperature of 298.3 K to ensure that separation did not take place. The tie lines were determined from mixtures of known composition in the immiscible region. The flasks were well shaken and the phases allowed to separate. The 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) Analytical Carlo Erba, 99 mole %; dried with anhydrous 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 ±0.0005 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).