SDS Volume (3819)

Volume 69. Ternary Alcohol-Hydrocarbon-Water Systems, p None

Original Measurements

Letcher, T. M.; Wootton, S.; Shuttleworth, B.; Heyward, C.; J. Chem. Thermodyn 18, 1037 (1986).

Variables:

Room Temp: 298 $\pu{K}$

Prepared by:

A. Skrzecz

Method/Apparatus/Procedure:

The titration method, adapted from [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:

Ambient temperature: Composition ±0.0005 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).