Components:
(1) 2-Propanol,
C3H8O; [67-63-0]
NIST WebBook
(2) Heptane,
C7H16; [142-82-5]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Letcher, T. M.; Wootton, S.; Shuttleworth, B.; Heyward, C.; J. Chem. Thermodyn 18, 1037 (1986).
Variables:
Ambient temperature: 298 K
Prepared by:
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:
- Aldrich, Gold label, 99.5 mole%; dried with potassium carbonate, distilled.
- Analytical Carbo Erba, purity 99.5 mole%; purified by passing through columns containing silica gel and basic alumina.
- De-ionized.
Estimated Errors:
Ambient temperature: Composition ±0.005 mole fraction for measured points, ±0.01 mole fraction for tie-lines extremities in the worst case (authors).
Mass concentration (m/v) (1): Not reported.
References
1 Briggs; S. W.; Comings, E. W.; Ind. Eng. Chem. 35, 411 (1943).
Experimental Values:
Compositions along the saturation curve
| T (°C) | T (K) | x1 | x2 | w1 | w2 |
|---|---|---|---|---|---|
| 25.0 | 298.2 | 4.9 x 10-2 | 0.0 | 1.47 x 10-1 | 0.0 |
| 25.0 | 298.2 | 1.28 x 10-1 | 2 x 10-3 | 3.26 x 10-1 | 9 x 10-3 |
| 25.0 | 298.2 | 2.09 x 10-1 | 9 x 10-3 | 4.56 x 10-1 | 3.3 x 10-2 |
| 25.0 | 298.2 | 3.13 x 10-1 | 3.5 x 10-2 | 5.52 x 10-1 | 1.03 x 10-1 |
| 25.0 | 298.2 | 4.13 x 10-1 | 8.7 x 10-2 | 5.83 x 10-1 | 2.05 x 10-1 |
| 25.0 | 298.2 | 4.44 x 10-1 | 2.42 x 10-1 | 4.72 x 10-1 | 4.29 x 10-1 |
| 25.0 | 298.2 | 3.78 x 10-1 | 4.49 x 10-1 | 3.21 x 10-1 | 6.35 x 10-1 |
| 25.0 | 298.2 | 1.67 x 10-1 | 7.93 x 10-1 | 1.11 x 10-1 | 8.81 x 10-1 |
Compositions of coexisting phases
| T (°C) | T (K) | x1 | x2 | w1 | w2 |
|---|---|---|---|---|---|
| 25.0 | 298.2 | 2.45 x 10-1 | 6.80 x 10-1 | 1.75 x 10-1 | 8.09 x 10-1 |
| 25.0 | 298.2 | 1.55 x 10-1 | 8.17 x 10-1 | 1.02 x 10-1 | 8.93 x 10-1 |
| 25.0 | 298.2 | 1.02 x 10-1 | 8.80 x 10-1 | 6.5 x 10-2 | 9.32 x 10-1 |
| 25.0 | 298.2 | 2.68 x 10-1 | 1.9 x 10-2 | 5.22 x 10-1 | 6.2 x 10-2 |
| 25.0 | 298.2 | 1.71 x 10-1 | 5 x 10-3 | 4.01 x 10-1 | 2.0 x 10-2 |
| 25.0 | 298.2 | 1.08 x 10-1 | 2 x 10-3 | 2.86 x 10-1 | 9 x 10-3 |
