Total-pressure vapor-liquid equilibrium (VLE) data are reported at approximately 298, 348, and 398 K for each of four 1-chlorobutane binaries with ethyl acetate, acetonitrile, nitromethane, and acetone as the other component. The experimental PTx data were reduced to , 7,, and GE values by both the Mlxon-Gumowskl-Carpenter and the Barker methods; the Mixon et al. results were deemed better and are reported. Six Ge correlations were tested In the Barker data reduction; the five-constant Redllch-KIster equation gave the best results. Various equations of state were used to estimate the vapor-phase fugaclty coefficients; the Peng-Robinson results were used for the values reported.

This paper is the first in a series of reports on the critical evaluation of vapor-liquid equilibrium, heat of mixing, and volume change of mixing data for binary liquid mixtures of nonelectrolytes. The specific evaluation procedures for each property will be covered in subsequent articles. This paper describes the general procedures used to support the mixture evaluation work. The areas covered include the procedures used to cover the primary and secondary literature, the computer program libraries developed for pure compound and mixture data processing, the procedures used to evaluate and correlate the pure compound property data for use by the mixture programs, and the efforts made to make the best equation of state available to the vapor-liquid equilibrium data reduction programs. Improvements are suggested for the presentation of mixture data in the literature.

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Total-pressure vapor-liquid equilibrium (VLE) data are reported at approximately 298, 348, and 398 K for each of three nitromethane binaries with ethyl acetate, acetonitrile, and acetone as the other components. The experimental PTx data were reduced to y¡, ;, and GE values by both the Mlxon-Gumowskl-Carpenter and the Barker methods, but only the Mixon et al. results are reported In their entirety. Seven GE correlations were tested In the Barker data reduction with the five-constant Redllch-KIster equation giving the best results. The effect of the equation of state used to estimate the vapor-phase fugaclty coefficients was Investigated.

The methods used to evaluate subcritical binary PTxy vapor~liquid equilibrium data are described. The evaluation results for the benzene + cyclohexane system are presented.The needs for new experimental data are defined.