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Non-Random Two Liquid model

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Non-random two-liquid model
The non-random two-liquid model (short NRTL equation) is an activity coefficient model that correlates the activity coefficients  of a compound i with its mole fractions  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 bulk concentration. This difference is due to a difference between the interaction energy of the central molecule with the molecules of its own kind and that with the molecules of the other kind . The energy difference also introduces a non-randomness at the local molecular 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 thermodynamically consistent due to the assumption that the local composition around molecule i is independent of the local composition around molecule j. This assumption is not true, as was shown by Flemmer in 1976.

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Non-Random-Two-Liquid-Modell
Das Non-Random-Two-Liquid-Modell (kurz NRTL-Gleichung, dt. nicht-zufällig, zwei Flüssigkeiten) ist ein thermodynamisches Modell, das die Aktivitätskoeffizienten  eines chemischen Stoffgemischs mit seiner Zusammensetzung, ausgedrückt durch Molenbrüche , korreliert.

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