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In this work, liquid phase compositions for mixtures of water + methanol + ethyl methyl carbonate (EMC) + heptane, water + ethanol + EMC + heptane, and water + methanol + EMC, water + ethanol + EMC, and water + EMC + heptane at 25 °C were measured at atmospheric pressure. The modified UNIQUAC activity coefficient model was employed to correlate the experimental tie-line data, and the results were compared with ones obtained with the extended UNIQUAC model. The consistency of the measured tie-line data was ascertained by applying the Othmer–Tobias equation.

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Liquid-phase composition values for {water + methanol + ethyl methyl carbonate (EMC)} and (water + ethanol + EMC) were determined at temperatures of 293.15, 303.15, and 308.15 K at 101 kPa. Thermodynamic modified UNIQUAC and extended UNIQUAC models were used in regression of the experimental values, with average rootmean-square deviations of 0.96 and 1.45% in mole fraction, respectively. Moreover, optimum binary interaction parameters of (methanol or ethanol + EMC) were obtained by regression analysis of the phase composition values. The experimental data consistency was further ascertained by applying the Bachman equation. Distribution coefficients and separation factors were used to assess the extraction performance of EMC in the separation of methanol and ethanol from water.