IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: 1-Propanol with heptane and Water

   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 1-Proponal (n-propanol, propyl alcohol, n-propyl alcohol); C3H8O; [71-23-8]  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).

   Temperature = 298 K

Prepared By:
   A. Skrzecz

Experimental Data:   (Notes on the Nomenclature)
Compositions along the saturation curve
t/°CT/KMass Fraction w1 (compiler) Mass Fraction w2 (compiler)Mole Fraction x1Mole Fraction x2
Compositions of coexisting phases
t/°CT/KMass Fraction w1 (compiler) Mass Fraction w2 (compiler)Mole Fraction x1Mole Fraction x2Comment(s)
25298.20.1430.8490.2100.750hydrocarbon-rich phase
25298.20.0950.9000.1460.828hydrocarbon-rich phase
25298.20.0600.9370.0950.889hydrocarbon-rich phase
25298.20.4590.0290.2100.008water-rich phase
25298.20.3280.0530.1350.013water-rich phase
25298.20.1950.0050.0680.001water-rich phase
   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) Merck, synthesis grade; dried with magnesium metal activated with iodine, 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).

   1 S. W. Briggs and E. W. Comings, Ind. Eng. Chem. 35, 411 (1943).