Ternary Corrections in the Liquid-Liquid Equilibria for Four-Component System Heptane-Toluene-N-Methylpyrrolidone-Ethylene Glycol

1992 ◽  
Vol 57 (1) ◽  
pp. 16-25
Author(s):  
Elena Graczová ◽  
Július Surový
Keyword(s):  
Ethylene Glycol ◽  
Thermodynamic Description ◽  
Weight Ratio ◽  
Computation Method ◽  
Liquid Equilibrium ◽  
Component System ◽  
Order Expansion ◽  
Nrtl Equation ◽  
Equilibrium Data ◽  
Ternary Contribution

Prediction for four-component liquid-liquid equilibrium is based on binary a ternary equilibrium data. Three-parameter equations for the excess Gibbs energy (NRTL equation, Redlich-Kister 4th order expansion and Wilson equation in Novák modification) extended by universal ternary contribution were employed for a thermodynamic description of the four-component system. The computation method was applied for a model four-component system heptane-toluene-N-methylpyrrolidone-ethylene glycol, t = 50 °C. The computed equilibrium data were compared with experimental ones measured for the weight ratio of the mixture N-methylpyrrolidone per ethylene glycol 20/80, 40/60 and 60/40.

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

1992 ◽  
Vol 57 (1) ◽  
pp. 7-15
Author(s):  
Elena Graczová ◽  
Július Surový ◽  
Soňa Bafrncová
Keyword(s):  
Ethylene Glycol ◽  
Mixed Solvent ◽  
Heterogeneous Systems ◽  
Wilson Equation ◽  
Order Expansion ◽  
Component Systems ◽  
Equilibrium Data ◽  
Evaluation Of Parameters ◽  
Ternary Data ◽  
Ternary Contribution

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.

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