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Title: Prediction of thermodynamic consistency of vapour-liquid equilibrium of a two-phase system in the presence of the salting-in and salting-out effects
Authors: Che-Galicia, Gamaliel
Dutta, Abhishek ×
Dhar, Abhishek
Ramana Murthy, B. Venkata
Al-Zahrani, Mohammed Ibrahim
Raychaudhuri, Uttam
Fran├žois, An
Castillo, Carlos O. #
Issue Date: 2015
Publisher: Taylor & Francis
Series Title: Indian Chemical Engineer vol:57 issue:1 pages:1-12
Abstract: Salt effect on vapor liquid equilibrium (VLE) has been a subject of intense investigation from experimental and modeling perspectives since the salting-in and salting-out effects might eliminate the possibility of azeotrope formation at saturation. Nevertheless, thermodynamic consistency evaluation of data generated from this type of studies, accounting for non-idealities of one or two of the phases involved is mandatory. In this communication, a primary evaluation of thermodynamic consistency under a non-ideal VLE situation of data generated for an ethanol-water system with and without the addition of inorganic potassium chloride (KCl) salt is presented. The equilibrium data (T-x-y diagram) for ethanol-water system is generated under isobaric conditions, with and without 2 and 4 g/L concentration levels of KCl. The isobaric VLE data of ethanol-water system saturated with KCl concentrations is correlated by means of a modified Raoult’s law to predict the activity coefficient of the volatile components. Activity coefficients are evaluated using a state equation and fugacities as well. Both methodologies give identical activity coefficients, indicating that Raoult’s law is a simple approach to calculate these parameters. Thermodynamic consistency of VLE data with and without the addition of KCl is validated from a simple but reliable strategy that makes use of the Gibbs Duhem plot and Murthy’s approach which avoids the use of enthalpy of mixing.
ISSN: 0019-4506
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Materials Technology TC, Campus Group T Leuven
Technologiecluster Materialentechnologie
× corresponding author
# (joint) last author

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