Vapour-liquid equilibrium in the binary systems formed by ethylene glycol, diethylene glycol, and N-methylpyrrolidone

1989 ◽  
Vol 54 (11) ◽  
pp. 2856-2862 ◽  
Author(s):  
Július Surový ◽  
Elena Graczová ◽  
Jana Ovečková
Keyword(s):  
Gibbs Energy ◽  
Ethylene Glycol ◽  
Diethylene Glycol ◽  
Excess Gibbs Energy ◽  
Binary Systems ◽  
Ideal Solution ◽  
Liquid Equilibrium ◽  
Equilibrium Data ◽  
Foregoing Paper ◽  
Wilson And Nrtl Equations

Vapour-liquid equilibrium data are given for the binary systems ethylene glycol (EG)-N-methylpyrrolidone (NMP), ethylene glycol-diethylene glycol (DEG), and N-methylpyrrolidone-diethylene glycol at 50°C. The measurement of vapour-liquid equilibrium was carried out in a modified version of semimicrostill from foregoing paper. This still makes it possible to measure even at the pressures of the order 101 Pa. The dependence of the excess Gibbs energy on composition was expressed by the 4th order Redlich-Kister, Wilson, and NRTL equations. The systems EG-NMP and DEG-NMP exhibit negative deviations from ideal behaviour, EG with DEG form practically ideal solution.

Measurement of vapour-liquid equilibrium data of liquids with low vapour pressure

1987 ◽  
Vol 52 (2) ◽  
pp. 264-270
Author(s):  
Július Surový ◽  
Elena Graczová ◽  
Ján Dojčanský
Keyword(s):  
Gibbs Energy ◽  
Ethylene Glycol ◽  
Fourth Order ◽  
Vapour Pressure ◽  
Negative Deviation ◽  
Liquid Equilibrium ◽  
Good Consistency ◽  
Equilibrium Data ◽  
Equilibrium Phases ◽  
Glycol Solution

A semimicrostill for measuring vapour-liquid equilibrium data suitable especially for the determination at pressures about 100 Pa is described. The still operates isothermally on the principle of differential distillation. The composition of equilibrium phases is determined chromatographically. The error caused by unstationariness of the apparatus was studied. As an example of its use, the vapour-liquid equilibrium data of the N-methylpyrrolidone-ethylene glycol solution at 50 °C are reported. The dependence of excess Gibbs energy on composition was expressed by means of the fourth-order Redlich-Kister and NRTL equations. The system exhibits negative deviation from ideal behaviour. Thermodynamic treatment proves a good consistency of the equilibrium data measured.

Determination of the concentration dependence of the second derivative of Gibbs' energy with respect to composition on the basis of vapour-liquid equilibrium data

1981 ◽  
Vol 46 (12) ◽  
pp. 2989-3002 ◽  
Author(s):  
Josef P. Novák ◽  
Jaroslav Matouš ◽  
Josef Šobr ◽  
Jiří Pick
Keyword(s):  
Gibbs Energy ◽  
Concentration Dependence ◽  
Binary Systems ◽  
Second Derivative ◽  
Liquid Equilibrium ◽  
Equilibrium Data

The course of the second derivative of Gibbs' energy with respect to composition for binary systems is evaluated. The representation of this quantity in terms of different correlation relations (the Wilson, NRTL and UNIQUAC equations and the ASOG and UNIFAC methods) is also discussed.

On Temperature Dependence of Excess Gibbs Energy

1999 ◽  
Vol 64 (7) ◽  
pp. 1093-1099 ◽  
Author(s):  
Ivona Malijevská ◽  
Anatol Malijevský
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Temperature Dependence ◽  
Excess Gibbs Energy ◽  
Excess Enthalpy ◽  
Excess Heat Capacity ◽  
Wilson Equation ◽  
Excess Heat ◽  
Energy Excess ◽  
Wilson And Nrtl Equations

Temperature dependence of GE is discussed for three widely used equations linear and nonlinear in parameters. It is shown that the Wilson equation predicts always positive excess heat capacity regardless of values of its parameters. Several temperature modifications of the Redlich-Kister, Wilson and NRTL equations are discussed with respect to the sign of the excess Gibbs energy, excess enthalpy and excess heat capacity.

Gas−Liquid Equilibrium Data for Sulfur Dioxide + Nitrogen in Diethylene Glycol + Water at 298.15 K and 123.15 kPa

2010 ◽  
Vol 55 (3) ◽  
pp. 1446-1448 ◽  
Author(s):  
Jianbin Zhang ◽  
Guohua Chen ◽  
Pengyan Zhang ◽  
Fang Han ◽  
Jinfei Wang ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Diethylene Glycol ◽  
Liquid Equilibrium ◽  
Equilibrium Data

Isobaric Low-Pressure Vapor–Liquid Equilibrium Data for Ethylbenzene + Styrene + Sulfolane and the Three Constituent Binary Systems

2011 ◽  
Vol 56 (9) ◽  
pp. 3510-3517 ◽  
Author(s):  
Mark T. G. Jongmans ◽  
Jenny I. W. Maassen ◽  
Adriaan J. Luijks ◽  
Boelo Schuur ◽  
André B. de Haan
Keyword(s):  
Binary Systems ◽  
Low Pressure ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Equilibrium Data ◽  
Constituent Binary ◽  
Vapor Liquid
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