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Abstract
Ternary liquid—liquid equilibrium data for the system water-ethanol-methyl ethyl ketone were obtained at 298.15 and 318.15 K. Data for the binodal curves have been determined by the cloud-point method and conjugate points on tie-lines were determined by gas-chromatographic analysis. Tie-line data at each temperature were satisfactorily correlated by the Othmer and Tobias' method and the plait points coordinates were estimated. The experimental data were also fitted with the UNIFAC group contribution method for the activity coefficients using the isoactivity conditions as restraint equations and with the NRTL and UNIQUAC models.