Equilibrium data for the water + 1-propanol + nitromethane ternary system from room temperature (318.2 K) up to 373.2 K are reported, in order to determine the extractive properties of nitromethane for the separation of 1-propanol from aqueous solutions. The effect of temperature on liquid-liquid phase equilibrium was also studied, and its consequences are discussed. On the other hand, tie-line data were satisfactorily correlated by the Othmer and Tobias method. The experimental data are compared with values calculated by the NRTL and UNIQUAC equations for the ternary mixture, and the predictions obtained by the UNIFAC method are also included. While the water + nitromethane system has a binary upper critical solution temperature of 384 K, no ternary upper critical solution temperature was observed. It is concluded that nitromethane is appropriate for the extraction process since all distribution coefficients and selectivities have sufficiently high values for the range of temperature studied. On the other hand, the small influence of temperature on the extractive properties for this ternary system, shows that it is not necessary to use higher temperatures for the extraction process.