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Reformulation of Wong‐Sandler mixing rule for cubic equations of state
Author(s) -
Orbey Hasan,
Sandler Stanley I.
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410325
Subject(s) - unifac , mixing (physics) , cubic function , ternary operation , thermodynamics , van der waals force , equation of state , binary number , activity coefficient , chemistry , dilution , mathematics , statistical physics , mathematical analysis , physics , quantum mechanics , arithmetic , organic chemistry , molecule , aqueous solution , computer science , programming language
The cubic equation of state mixing rule of Wong and Sandler is reformulated in a way that eliminates one of its parameters and so that it can go smoothly from activity coefficient‐like behavior to the classical van der Waals one‐fluid mixing rule merely by variation of its parameters. The parameters in the reformulated mixing rule can be obtained from correlation of vapor–liquid equilibrium data or from the two infinite dilution activity coefficients for each binary pair in the mixture. When these activity coefficients are estimated from the UNIFAC group contribution model, the mixing rule becomes completely predictive. The correlative and completely predictive forms of this mixing rule are tested here and shown to be accurate for five difficult binary systems and one ternary mixture over large ranges of temperature and pressure.