Liquid-liquid equilibria data for the ternary system 2-methoxy-2-methylpropane (methyl tert-butyl ether) + phenol + water were measured at temperatures of (298.15, 313.15, and 323.15) K at atmosphere pressure. The distribution coefficient and selectivity were used to evaluate the extraction performance of the 2-methoxy-2-methylpropane. The reliability of the experimental tie-line data was verified by the Hand and Bachman equations. The experimental data were correlated with the NRTL and UNIQUAC models. The binary interaction parameters of these two models were reported. Both models correlated the experimental data successfully. In comparison, the NRTL model presents a better prediction than the UNIQUAC model.