In Part I (Tsonopoulos and Wilson, 1983), the mutual solubilities of three Ca hydrocarbons (benzene, cyclohexane, n-hexane) and water were experimentally investigated and, together with critically selected literature data, were correlated up to the three-phase critical end point. The present paper extends this analysis to the mutual solubilities of three Cs hydrocarbons (ethylbenzene, ethylcyclohexane, n-octane) and water, which have been measured at the threephase equilibrium pressure up to the critical temperatures (568,561 and 539 K, respectively), A thermodynamic analysis of these new measurements and of available literature data has been performed up to the three-phase critical end point. Information is also provided on vapor-phase equilibrium compositions. The solubility of hydrocarbons in water has been used to calculate Henry's constants, while the solubility and volatility of water in hydrocarbons has been successfully correlated with several modifications of the Redlich-Kwong equation of state. SCOPEThe importance of hydrocarbon/water mutual solubilities to the design and operation of process equipment in refineries and petrochemical pIants was discussed by Tsonopoulos and Wilson (1983) [this reference will be cited as TW (1983)J The same reference also discussed the correlation and prediction of mutual solubilities, Henry's constants for hydrocarbons in water, and the use of equations of slate. All these were applied to Ce hydrocarbons, for which much more is known than for other hydrocarbons.Our work continues with CS hydrocarbons to study the effect of carbon number on mutual solubilities. But we have also expanded the scope of our study by including experimental data for the vapor composition and the three-phase critical end point, the highest temperature at which the vapor and the two liquid phases coexist.

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