Collect. Czech. Chem. Commun. 1992, 57, 7-15

Ternary Corrections in the Liquid-Liquid Equilibria Computation for Three-Component Systems Containing Components of Mixed Solvent N-Methylpyrrolidone-Ethylene Glycol

Elena Graczová, Július Surový and Soňa Bafrncová

Department of Chemical and Biochemical Engineering, Slovak Technical University, 812 37 Bratislava


Presented are the liquid-liquid (L-L) equilibrium data for three-component heterogeneous systems toluene-N-methylpyrrolidone-ethylene glycol, heptane-N-methylpyrrolidone-ethylene glycol and heptane-toluene-ethylene glycol at 50 °C. Equations for the excess Gibbs energy (NRTL. Novák modification of Wilson equation and Redlich-Kister 4th order expansion) extended by ternary universal contribution were employed for correlating the L-L equilibrium data. The binary equation parameters were independently evaluated from the binary equilibrium data. The presented ternary data served for evaluation of parameters of the universal ternary contribution.