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Abstract: (Liquid+liquid) equilibrium (LLE) data for ternary system {heptane (1)+ m-xylene (2)+ N-formylmorpholine (3)} have been determined experimentally at temperatures ranging from 298.15K to 353.15K. Complete phase diagrams were obtained by determining solubility and tie-line data. Tie-line compositions were correlated by Othmer–Tobias and Bachman methods. The universal quasichemical activity coefficient (UNIQUAC) and The non-random two liquids equation (NRTL) were used to correlate the phase equilibrium in the system using the interaction parameters determined from experimental data. It is found that UNIQUAC and NRTL used for LLE could provide a good correlation. Distribution coefficients, separation factors, and selectivity were evaluated for the immiscibility region. [Copyright &y& Elsevier]