Abstract
Liquid + liquid equilibrium was determined for three ternary systems water + ethanol + dialkyl phthalates (dimethyl, diethyl, and dibutyl phthalate) at 298.15 K. The turbidimetry titration method was used to obtain the binodal curves. Direct analytical methods were used to determine the composition of coexisting phases. The critical point composition was extrapolated from equilibrium data for each of the ternary systems using the Coolidge method. Excess enthalpy data were obtained for the system dimethyl phthalate + ethanol at 298.15 K. These, along with ternary and literature binary data, allowed a thorough thermodynamic description of the system water + ethanol + dimethyl phthalate. The modified Wilson equation was employed for this purpose.
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