Fluid Phase Equilibria, Vol.218, No.1, 69-76, 2004
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
Reliable P-x and enthalpy of mixing data have been measured for the ternary systems 1-hexene + water + N-methyl-2-pyffolidone (NMP), 3-methylcyclopentene + water + NMP, 3-methylpentane + water + NMP, 1-pentene + water + NMP, and 2-methylbutane + water + NMP at 90 degreesC, and for 1-hexene + water + NMP also at 140 degreesC 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. (C) 2003 Elsevier B.V. All rights reserved.
Keywords:experimental data;VLE;activity coefficients;excess enthalpies;extractive distillation;selective solvents