Influence of water on the vapor–liquid equilibria, activity coefficients at infinite dilution and enthalpies of mixing for mixtures of N-methyl-2-pyrrolidone with C5 or C6 hydrocarbons

Abstract

Reliable P– x and enthalpy of mixing data have been measured for the ternary systems 1-hexene+water+ N-methyl-2-pyrrolidone (NMP), 3-methylcyclopentene+water+NMP, 3-methylpentane+water+NMP, 1-pentene+water+NMP, and 2-methylbutane+water+NMP at 90 °C, and for 1-hexene+water+NMP also at 140 °C using a static apparatus and an isothermal flow calorimeter, respectively. Activity coefficients at infinite dilution for the different hydrocarbons in the solvent have been derived from the P– x data in the dilute composition range, where the water content of NMP ranged between 0 and 6 wt.%. NRTL parameters have been fitted to the experimental data.