Joffe-Zudkevitch equation

Redlich-Kwong-Joffe-Zudkevitch equation of state with the... 

An abbreviated chronology of the development of RK methods is a useful way to begin this discussion. Although Wilson (1) first proposed the introduction of a temperature-dependent parameter to replace one of two constants in 1964, much of the popularity of the RK method stems from the extremely simple temperature dependence introduced by Soave (2) in 1972. In the intervening period, Joffe and Zudkevitch (3,4,5) in 1969 and 1970 and Chang and Lu (6) in 1970 had proposed making both constants temperature dependent, inspired in part by a series of papers by Chueh and Prausnitz (7,8) which demonstrated that the RK equation can be adapted to predict both vapor and liquid properties. The more complex Joffe-Zudkevitch (JZ) method was not as widely adopted as the Soave procedure. 

A more difficult and industrially important test for an equation of state is the ability to predict the VLE of ternary and multicomponent mixtures using interactions parameters fitted to corresponding binary data. Tsonopoulos and co-workers analyzed experimental VLE data for 6 ternary mixtures and showed that Redlich-Kwong-Joffe-Zudkevitch is again slightly more precise than the Soave-Redlich-Kwong and Peng-Robinson equations of state. 

Joffe J., Schroeder G.M., Zudkevitch D., "Vapor-liquid Equilibria with the Redlich-Kwong Equation of State", AIChF-J. 1970, 48,261-266. 

Zudkevitch, D., and Joffe, J. Correlation and prediction of vapor-liquid equilibria with the Redlich-Kwong equation of state. A. I. Ch. E. J. 16 (1970) 112. 

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