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Non Random Two Liquid Model Presented By Nahid Arefin Introduction  The non-random two-liquid model (short NRTL equation) is an activity coefficient model that correlates the activity coefficients γi of a compound i with its mole fractions xi in the liquid phase concerned. It is frequently applied in the field of chemical engineering to calculate phase equilibria. The concept of NRTL is based on the hypothesis of Wilson that the local concentration around a molecule is different from the bu
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  Non Random Two Liquid Model Presented By Nahid Arefin  Introduction  The non-random two-liquid model (short NRTL equation) is anactivity coefficient model that correlates the activity coefficients γ i   of a compound i with its mole fractions x  i  in the liquid phaseconcerned. It is frequently applied in the field of chemicalengineering to calculate phase equilibria. The concept of NRTL isbased on the hypothesis of Wilson that the local concentrationaround a molecule is different from the bulk concentration. Thisdifference is due to a difference between the interaction energy ofthe central molecule with the molecules of its own kind U  ii  and thatwith the molecules of the other kind U  ij  . Dan F. Smith Department of Chemical Engineering, Lamar University  Introduction The energy difference also introduces a non-randomness at the localmolecular level. The NRTL model belongs to the so-called local-composition models. Other models of this type are the Wilson model,the UNIQUAC model, and the group contribution model UNIFAC.These local-composition models are not thermodynamicallyconsistent due to the assumption that the local composition aroundmolecule i is independent of the local composition around molecule j.This assumption is not true, as was shown by Flemmer in 1976. Dan F. Smith Department of Chemical Engineering, Lamar University  Equations for a binary mixture For a binary mixture the following equations are used: Dan F. Smith Department of Chemical Engineering, Lamar University
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