THERMODYNAMIC CONSISTENCY TEST OF VAPOR-LIQUID-EQUILIBRIUM DATA - METHANOL WATER, BENZENE CYCLOHEXANE AND ETHYL METHYL KETONE WATER

A thermodynamic consistency test of vapor-liquid equilibrium data at low pressure has been proposed which permits the over-all check of the data by combining three tests; i) point test and ii) area test based on the generalized Gibbs-Duhem equation, and iii) infinite dilution test on the related thermodynamic equations. The proposed method was applied to the binary miscible systems methanol ∼ water and benzene ∼ cyclohexane at normal pressure and at isothermal conditions, and the partially miscible system, ethyl methyl ketone ∼ water at normal pressure. The number of data sets is 61 in total. The thermodynamic consistency test permits the effective selection of the reliable data among several data sets. © 1990.