The vapor-liquid equilibria (VLE) data are essential for the design of distillation columns to separate propylene glycols mixtures, obtained via the hydrolysis of 1,2-epoxy propane. In this study there are reported data for four binary systems involved, such as water + propylene glycols. VLE data have been measured in the temperature range (295.15 to 460.15) K and pressure up to 34.529 kPa for the following binary systems: water +1,2-propanediol (monopropylene glycol, MPG), water +1-(2-hydroxypropoxy)propan-2-ol (dipropylene glycol, DPG), water +2-[2-(2-hydroxypropoxy)propoxy]propan- 1-ol (tetrapropylene glycol, TPG), and water +2-(2-[2-(2-hydroxypropoxy)- propoxy]propoxy)propan-1ol (tetrapropylene glycol, TePG). The equipment used was a static apparatus built in our laboratory. The only literature data available for these systems were for the water + MPG binary system. The experimental data obtained were correlated with the NRTL model. The results showed a fairly good agreement between the model and the experimental data with a maximum deviation in composition terms of 3%.