Fluid phase equilibria modified UNIFAC application to thermodynamic properties of binary mixtures containing sulfolane

The data available in the literature and our new experimental data of vapour-liquid equilibrium (VLE), molar excess enthalpies, HE, solid-liquid equilibrium (SLE) and activity coefficients at infinite dilution, γi∞, for mixtures of different organic solvents with sulfolane are examined on the basis of the group contribution model, modified UNIFAC (Dortmund). terchange coefficients for various groups/sulfolane contacts, amn and anm, of the modified UNIFAC were optimized. The model describes consistently the excess functions GE, HE and ln γi∞ of most of the experimental data (VLE and SLE).