Vapour-phase non-ideality in low-pressure vapour-liquid equilibrium data correlation

1980 ◽  
Vol 45 (11) ◽  
pp. 3057-3062 ◽  
Author(s):  
Jan Linek
Keyword(s):  
Experimental Data ◽  
Phase Composition ◽  
Liquid Phase ◽  
Low Pressure ◽  
Vapour Phase ◽  
Liquid Equilibrium ◽  
Ideal Behavior ◽  
Equilibrium Data ◽  
Vle Data ◽  
Volumetric Behavior

The effect of vapour-phase imperfections and the volumetric behavior of liquid phase on the low-pressure VLE data reduction was investigated. The errors in the vapour-phase composition due to processing experimental data assuming ideal behavior of the vapour phase were evaluated.

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.

Isobaric Vapor-Liquid Equilibria of Hexamethyl Disiloxane + Ethyl Acetate System at Normal Pressure

2011 ◽  
Vol 396-398 ◽  
pp. 968-972
Author(s):  
Wen Lin Zhang ◽  
Nan Meng ◽  
Ru Yi Sun ◽  
Chun Li Li
Keyword(s):  
Experimental Data ◽  
Ethyl Acetate ◽  
Normal Pressure ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Equilibrium Data ◽  
Vle Data ◽  
Vapor Liquid Equilibria ◽  
Ethyl Acetate System ◽  
Vapor Liquid

Vapor-liquid equilibrium data of hexamethyl disiloxane + ethyl acetate system at 101.3kPa were measured by using double circulating vapor-liquid equilibrium still. The thermodynamic consistency of the VLE data was examined by Herrington method. Experimental data was correlated by NRTL and UNIQUAC parameter models. Both of the models satisfactorily correlated with the VLE data. The result showed that the NRTL model was the most suitable one to represent experimental data satisfactorily and the system had a minimum temperature azeotrope at 350.31 K and the mole azeotropic composition was 0.0330.

scholarly journals Isothermal Vapor-Liquid Equilibrium of Methanol + Glycerol and 1-Propanol + Glycerol

2018 ◽  
Vol 16 (1) ◽  
pp. 111 ◽  
Author(s):  
Annas Wiguno ◽  
Asalil Mustain ◽  
Wahyu Fazar Eka Irwansyah ◽  
Gede Wibawa
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Ideal Liquid ◽  
Vapor Pressures ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Vle Data ◽  
Activity Coefficient Models ◽  
The Ideal ◽  
Vapor Liquid

Isothermal vapor-liquid equilibrium (VLE) data for two binary mixtures of methanol + glycerol and 1-propanol + glycerol were determined at the temperature range from (313.15 to 363.15) K using a simple quasi-static ebulliometer. All systems showed that the vapor pressures increased with increasing alcohols (methanol or 1-propanol) concentrations at corresponding system. The Wilson, Non-Random Two-Liquid (NRTL) and Universal Quasi-Chemical (UNIQUAC) activity coefficient models were used to correlate the experimental data. Both systems showed slightly deviations from the ideal liquid phase behavior.

scholarly journals Use of the SSF equations in the Kojima-Moon-Ochi thermodynamic consistency test of isothermal vapour-liquid equilibrium data

2000 ◽  
Vol 65 (12) ◽  
pp. 877-889
Author(s):  
Jelena Jelic ◽  
Aleksandar Tasic ◽  
Bojan Djordjevic ◽  
Slobodan Serbanovic
Keyword(s):  
Experimental Data ◽  
Binary Systems ◽  
Thermodynamic Consistency ◽  
Data Sets ◽  
Liquid Equilibrium ◽  
Consistency Test ◽  
Equilibrium Data ◽  
Vle Data ◽  
Kister Equation

The Kojima-Moon-Ochi (KMO) thermodynamic consistency test of vapour-liquid equilibrium (VLE) measurements for 32 isothermal data sets of binary systems of various complexity was applied using two fitting equations: the Redlich-Kister equation and the Sum of Symmetrical Functions. It was shown that the enhanced reliability of the fitting of the experimental data can change the conclusions drawn on their thermodynamic consistency in those cases of VLE data sets that are estimated to be near the border of consistency.

scholarly journals Predictions of the vapor-liquid equilibrium data for low-GWP Hydrofluorocarbons + polyethylene-glycol dimethylether solvents by modified UNIFAC model

2021 ◽  
Vol 267 ◽  
pp. 02052
Author(s):  
Xiao Zhang ◽  
Liang Cai ◽  
Jingyi Qiao
Keyword(s):  
Experimental Data ◽  
Polyethylene Glycol ◽  
Large Deviations ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Liquid Equilibrium ◽  
Unifac Model ◽  
Equilibrium Data ◽  
Vle Data ◽  
Absorption Refrigeration System

The working fluids are crucial for developing the absorption refrigeration system. Our previous work has proposed three novel working pairs, which uses the low-GWP HFCs (R32, R152a and R161) as the refrigerants and the polyethylene-glycol dimethylether solvent DMETEG as the absorbent. To explore the VLE behaviors of HFCs in other longer chain structures of polyethylene-glycol dimethylether solvents, the modified UNIFAC (Dortmund) model was applied for prediction. The previous binary parameters showed large deviations from the experimental data. Then the new binary parameters were obtained by regression. For R32+DMEDEG and R152a/R161+DMETrEG, the prediction ARAD results were reduced from 17.13%, 24.06% and 12.48% to 3.71%, 2.61% and 6.86%, respectively. Finally, the VLE data of R161 + PGDE at the temperatures of 293.15-343.15K were predicted.

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.

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

Parameters of the Bender Equation of State for Chloro Derivatives of Methane and Chlorobenzene

2001 ◽  
Vol 66 (6) ◽  
pp. 833-854 ◽  
Author(s):  
Ivan Cibulka ◽  
Lubomír Hnědkovský ◽  
Květoslav Růžička
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Virial Coefficient ◽  
Second Virial Coefficient ◽  
Virial Coefficients ◽  
Liquid Equilibrium ◽  
Second Virial Coefficients ◽  
Equilibrium Data ◽  
State Behaviour ◽  
Derivatives Of

Values of adjustable parameters of the Bender equation of state evaluated for chloromethane, dichloromethane, trichloromethane, tetrachloromethane, and chlorobenzene from published experimental data are presented. Experimental data employed in the evaluation included the data on state behaviour (p-ρ-T) of fluid phases, vapour-liquid equilibrium data (saturated vapour pressures and orthobaric densities), second virial coefficients, and the coordinates of the gas-liquid critical point. The description of second virial coefficient by the equation of state is examined.

scholarly journals Computation of Isobaric Vapor-Liquid Equilibrium Data for Binary and Ternary Mixtures of Methanol, Water, and Ethanoic Acid from T, p, x, and HmE Measurements

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Daming Gao ◽  
Hui Zhang ◽  
Peter Lücking ◽  
Hong Sun ◽  
Jingyu Si ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Ternary System ◽  
Vapor Phase ◽  
Binary Systems ◽  
Model Parameters ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Molar Excess ◽  
Ethanoic Acid ◽  
Vle Data

Vapor-liquid equilibrium (VLE) data for the strongly associated ternary system methanol + water + ethanoic acid and the three constituent binary systems have been determined by the total pressure-temperature-liquid-phase composition-molar excess enthalpy of mixing of the liquid phase (p, T, x, HmE) for the binary systems using a novel pump ebulliometer at 101.325 kPa. The vapor-phase compositions of these binary systems had been calculated from Tpx and HmE based on the Q function of molar excess Gibbs energy through an indirect method. Moreover, the experimental T, x data are used to estimate nonrandom two-liquid (NRTL), Wilson, Margules, and van Laar model parameters, and these parameters in turn are used to calculate vapor-phase compositions. The activity coefficients of the solution were correlated with NRTL, Wilson, Margules, and van Laar models through fitting by least-squares method. The VLE data of the ternary system were well predicted from these binary interaction parameters of NRTL, Wilson, Margules, and van Laar model parameters without any additional adjustment to build the thermodynamic model of VLE for the ternary system and obtain the vapor-phase compositions and the calculated bubble points.

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