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.

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.

Isothermal and isobaric vapour-liquid equilibrium data in the tetrachloromethane-sec-butyl alcohol system

1983 ◽  
Vol 48 (9) ◽  
pp. 2446-2453 ◽  
Author(s):  
Jan Linek
Keyword(s):  
Experimental Data ◽  
Boiling Point ◽  
Butyl Alcohol ◽  
Correlation Equations ◽  
Wilson Equation ◽  
Liquid Equilibrium ◽  
Raoult’S Law ◽  
System A ◽  
Equilibrium Data ◽  
Alcohol System

Isothermal vapour-liquid equilibrium data at 65, 73 and 80 °C and isobaric ones at 101.3 kPa were measured in the tetrachloromethane-sec-butyl alcohol system. A modified circulation still of the Gillespie type was used for the measurements. Under the conditions of measurement, the system exhibits positive deviations from Raoult's law and minimum boiling-point azeotropes. The experimental data were fitted to a number of correlation equations, the most suitable being the Wilson equation.

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