scholarly journals Vapour-Liquid Equilibrium Relationships in Extractive Distillation

Nature ◽  
1952 ◽  
Vol 170 (4335) ◽  
pp. 935-935
Author(s):  
E. F. G. HERINGTON
Keyword(s):  
Extractive Distillation ◽  
Liquid Equilibrium ◽  
Equilibrium Relationships

Application of extended NRTL equation for ternary liquid-liquid and vapor-liquid-liquid equilibria description

2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Pavol Steltenpohl ◽  
Elena Graczová
Keyword(s):  
Extractive Distillation ◽  
Model Mixture ◽  
Mean Deviation ◽  
Liquid Equilibrium ◽  
Experimental Conditions ◽  
Nrtl Model ◽  
Mixture Separation ◽  
Equilibrium Data ◽  
Ternary Contribution ◽  
Vapor Liquid

AbstractSimulation of a hydrocarbons mixture separation by extractive distillation was based on binary vapor-liquid as well as liquid-liquid equilibrium data. Sulfolane was considered as extractive solvent for the selective toluene separation from a model mixture with heptane. For simulation of the chosen hydrocarbons mixture separation in the presence of an extractive solvent, the NRTL model was considered. A set of temperature-dependent binary NRTL parameters was evaluated independently by fitting the experimental vapor-liquid and liquid-liquid equilibrium data of the respective binary subsystems. In order to improve the description of the ternary vapor-liquid equilibrium, original NRTL model extended by the ternary contribution term was used. Parameters of the ternary contribution were obtained by direct fitting of available ternary liquid-liquid equilibrium data while employing the original binary NRTL parameters. Quality of the ternary vapor-liquid-liquid equilibrium description using the original and the extended excess Gibbs energy models was assessed by comparing the calculated compositions of conjugate liquid phases with experimental data. Using the extended NRTL model, mean deviation of the computed mole fractions decreased by approximately four times (9.73 × 10−3) compared to the value obtained using the original NRTL model. Both original and extended NRTL models were employed for the simulation of a model mixture separation by extractive distillation. At chosen experimental conditions, high purity distillate (x 1 > 0.999) was obtained. Results of the aromatics extractive distillation in the presence of sulfolane were compared to those obtained with N-methylpyrrolidone as the extractive solvent.

scholarly journals Vapor−Liquid Equilibrium For The Mixture of m-Xylene, Ethylbenzene and 1, 2, 4-Trichlorobenzene at 101.3 kPa

2021 ◽  
Author(s):  
Min Li ◽  
Yingmin Yu ◽  
Lanmu Liu ◽  
Jun Li ◽  
Yuhe Song
Keyword(s):  
Binary Data ◽  
Binary Systems ◽  
Extractive Distillation ◽  
Binary Interaction ◽  
Model Parameters ◽  
Liquid Equilibrium ◽  
Binary Interaction Parameters ◽  
Vle Data ◽  
Activity Coefficient Models ◽  
Vapor Liquid

Abstract The vapor-liquid phase equilibrium (VLE) data for binary systems of m-xylene + ethylbenzene, m-xylene + 1, 2, 4-trichlorobenzene, ethylbenzene + 1, 2, 4-trichlorobenzene and ternary system of m-xylene + ethylbenzene + 1, 2, 4-trichlorobenzene were determined with a modified Rose still at 101.3 kPa, and all the binary data passed the Wisniak’s test, which accorded with the thermodynamic consistency. Three activity coefficient models namely, Wilson, NRTL and UNIQUAC were used to correlate VLE data and get binary interaction parameters, then the ternary VLE data of m-xylene + ethylbenzene + 1, 2, 4-trichlorobenzene were estimated based on these model parameters using Aspen Plus software. The estimation values of the three models agree well with the experimental data. Moreover, the effect of 1, 2, 4-trichlorobenzene was analyzed, and it found to be an effective candidate extractant for the extractive distillation of ethylbenzene from mixed xylenes.

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