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Berechnungsmöglichkeiten für Dampf/Flüssigkeits‐Gleichgewichte
Author(s) -
Onken Ulfert
Publication year - 1978
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.330501005
Subject(s) - thermodynamics , bar (unit) , chemistry , mixing (physics) , activity coefficient , binary number , equation of state , liquid phase , component (thermodynamics) , physics , mathematics , meteorology , arithmetic , quantum mechanics , aqueous solution
Possibilities of calculating vapour/liquid equilibria . In calculations on vapour/liquid equilibria, the real mixing behaviour can generally be described by the liquid phase activity coefficients alone at pressures up to a few bar. Thermodynamically based relationships are available for these activity coefficients and for correlation of experimental equilibrium data. Those based on the principle of local composition permit description of many‐component equilibria in terms of binary data alone. The activity coefficients of systems for which no experimental data are available can be predicted by the U NIFAC method which has been developed on an broad front in recent years. A fundamentally different way of calculating vapour/liquid equilibria starts from an equation of state for each of the phases: models of this kind are used mainly for representing equilibria at higher pressures.