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Prediction of vapor — liquid equilibria: Derivation of a new expression for vapor — liquid equilibrium correlations
Author(s) -
Andiappan A.N.,
Mclean A. Y.
Publication year - 1972
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450500313
Subject(s) - expression (computer science) , binary number , isobaric process , thermodynamics , isothermal process , constant (computer programming) , binary system , energy (signal processing) , chemistry , statistical physics , mathematics , physics , computer science , statistics , arithmetic , programming language
To replace the interchange energy between two different types of molecules, two types of local energy parameters derived from Scott's two liquid concept are defined. When this definition is introduced into the quasichemical approximation, a new expression for correlating vapor‐liquid equilibria in binary systems results. The new expression is semi‐empirical in nature and for a binary system, it contains two adjustable parameters and a binary constant which are obtained from binary experimental data. It has been shown that the new expression can be used as a two‐parameter equation. Its application was tested with thirty‐four examples of highly non‐ideal systems, including twenty‐two systems at isobaric and twelve systems at isothermal conditions. Application to partially miscible systems is also examined. The results, correlated through the new expression, are compared with those obtained using the equations of Wilson and of Renon. The significance of the parameters of the new expression is discussed.