SDS Volume (3660)

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

Original Measurements

Nowakowska, J.; Kretschmer, C. B.; Wiebe, R.; J. Chem. Eng. Data 1, 42 (1956).

Variables:

Room Temp: 273 - 298 $\pu{K}$

Prepared by:

A. Skrzecz

Method/Apparatus/Procedure:

Points on the binodal curve were obtained by titrating a known mixture of two components by the third component until turbidity appeared or disappeared. The mixtures were prepared by volume with calibrated pipettes and the results converted to weight percent. Over most of the composition range alcohol-hydrocarbon mixtures were titrated with water. For 25 °C, the end point was taken when the mixture remained homogeneous at 25 °C, but become turbid at 24.8 °C. The titrations at 0 °C were performed in small conical flasks with magnetic stirrers placed in Dewar vessel. Tie lines were determined through measurements of refractive index at 25 °C of both phases in equilibrium and comparison with the values obtained on binodal curve. For solutions containing more than 40% ethanol the tie lines were obtained by measuring densities at 25 °C in a similar procedure. The experimental procedures were adapted mainly from [1].

Source and Purity of Materials:

1. Source not specified, commercial absolute grade; used as received; $\rho^{25} = \pu{785.97 kg m-3}$, water concentration 0.30 mass% (water was taken into account in calculations of composition).
2. Phillips, pure grade purity >99 mole%; used as received; $\rho^{25} = \pu{710.78 kg m-3}$.
3. Distilled.

Estimated Errors:

Ambient temperature: Conc. <0.1% (relative error) for ethanol in the region near 100% of hydrocarbon (tie lines).
Mass concentration (m/v) (1): Not reported.

References

¹ Washburn, E. R.; Hnizda, V.; Vold, R.; J. Am. Chem. Soc. 53, 3237 (1931).