Liquid-vapour equilibrium in strongly associating binary system propionic acid-cyclohexane

1980 ◽  
Vol 45 (6) ◽  
pp. 1748-1753 ◽  
Author(s):  
Marie Svítilová ◽  
Ivona Malijevská ◽  
Anatol Malijevský ◽  
Jiří Pick
Keyword(s):  
Binary System ◽  
Propionic Acid ◽  
Activity Coefficients ◽  
Chemical Equilibrium ◽  
Simultaneous Solution ◽  
Solution Of Equations ◽  
Equilibrium Data

Equilibrium data for the propionic acid-cyclohexane system at the pressure of 101.3 kPa are presented. The activity coefficients have been obtained by the simultaneous solution of equations of the phase and the chemical equilibrium and correlated by the Wilson, HMW, NRTL and Orye equations.

Vapour-liquid equilibrium in the ternary system cyclohexane-acetic acid-propionic acid

1989 ◽  
Vol 54 (11) ◽  
pp. 2840-2847 ◽  
Author(s):  
Ivona Malijevská ◽  
Alena Maštalková ◽  
Marie Sýsová
Keyword(s):  
Acetic Acid ◽  
Ternary System ◽  
Propionic Acid ◽  
Activity Coefficients ◽  
Error Propagation ◽  
Analytical Techniques ◽  
Liquid Equilibrium ◽  
Consistency Test ◽  
Propagation Law ◽  
Equilibrium Data

Isobaric equilibrium data (P = 101.3 kPa) for the system cyclohexane-acetic acid-propionic acid have been measured by two different analytical techniques. Activity coefficients calculated by simultaneous solving of equations for the chemical and phase equilibria were subjected to a consistency test based on inaccuracies determined from the error propagation law, and were correlated by Wilson’s equation. The activity coefficients measured were compared with those calculated from binary vapour-liquid equilibrium data and with values predicted by the UNIFAC method.

A modified Gillespie still for measuring vapour-liquid equilibria

1987 ◽  
Vol 52 (2) ◽  
pp. 258-263
Author(s):  
Elena Graczová ◽  
Táňa Huňarová ◽  
Július Surový
Keyword(s):  
Experimental Data ◽  
Binary System ◽  
Activity Coefficients ◽  
Liquid Equilibrium ◽  
Equilibrium Data

A modification of the Gillespie still for measuring vapour-liquid equilibrium data is described. The still was tested at different working pressures within the range of 3.7 to 86.7 kPa by measuring the isothermal L-G equilibrium data for the binary system p-xylene-dimethylformamide at the temperatures of 60, 80, 100, 120, and 130 °C. The dependence of activity coefficients of components on composition was expressed by means of the Redlich-Kister and Wilson equations. The consistency of the experimental data as well as the agreement of some measured values with the data from literature furnishes an evidence of good functioning of the apparatus.

Excess Gibbs energy for binary mixtures of acetonitrile with acetic acid, propionic acid, isobutyric acid, and trimethylacetic acid

1991 ◽  
Vol 69 (12) ◽  
pp. 2117-2121 ◽  
Author(s):  
T. S. Banipal ◽  
B. S. Lark ◽  
S. Singh
Keyword(s):  
Acetic Acid ◽  
Gibbs Energy ◽  
Carboxylic Acids ◽  
Propionic Acid ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Excess Gibbs Energy ◽  
Composition Range ◽  
Isobutyric Acid ◽  
Dimerization Constant

Total vapour pressures for binary mixtures containing acetic acid, propionic acid, isobutyric acid, and trimethylacetic acid with acetonitrile have been measured for the entire composition range at 298.15 and 318.15 K using a static manometric method. All systems show positive deviations from Raoult's law, enhanced by both an increase in temperature and an increase in the methylation of acetic acid. Activity coefficients have been calculated by taking into consideration the dimerization of these carboxylic acids in the vapour phase. TSE values obtained from GE and earlier reported HE values are found to be negative for acetic acid, about zero for propionic and isobutyric acids, and positive for trimethylacetic acid for the whole composition range. The results have been interpreted in terms of various contributions such as depolymerization, heteromolecular dipole–dipole interactions, and the increasing dimerization constant and steric hindrance with increase of complexity of the acid. Key words: excess Gibbs energy, carboxylic acids, acetonitrile, activity coefficients

Isobaric vapour-liquid equilibrium data of the 1,2-dichloroethane-water system at 101.3 kPa

1989 ◽  
Vol 54 (11) ◽  
pp. 2848-2855 ◽  
Author(s):  
Daniel Bobok ◽  
Elemír Kossaczký ◽  
Július Surový
Keyword(s):  
Liquid Phase ◽  
Activity Coefficients ◽  
Water System ◽  
Vapour Phase ◽  
Solubility Data ◽  
Liquid Equilibrium ◽  
Equilibrium Data ◽  
Van Laar Equation

Isobaric vapour-liquid equilibrium data for the 1,2-dichloroethane-water system were calculated on the assumption of ideal behaviour of the vapour phase on using the van Laar equation for activity coefficients of the components in the liquid phase. The parameters of the van Laar equation were calculated from the solubility of 1,2-dichloroethane in water and of water in 1,2-dichloroethane determined experimentally in this work. On using the solubility data, the parameters of the heteroazeotropic point at the pressure of 101.3 kPa were also calculated.

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