Vapor-Liquid Equilibria Data for Ternary Mixtures: Methyl Ethyl Keton-n-Heptane-Toluene System

Abstract

\ apor-liquid equilibrium data for the system methyl ethyl ketone-n-heptane-toluene at 1 atmosphere pressure are presented. A method of determining thermodynamic consistency of the data from the Gibbs-Duhem equation THE development of azeotropic and extractive distillation as an important separation process of chemical industry has stimulated many investigations of the vapor-liquid equilibria of nonideal systems. While a large amount of data have been determined, correlations of such data in a generalized and conven-

Isobaric (vapour+liquid) equilibria data for the binary systems (toluene+acetic acid) and (toluene+methyl ethyl ketone) at atmospheric pressure

“…The RMSD values of toluene (1) þ methyl ethyl ketone (2) Figure 4. Comparison of the variation of the activity coefficients () in the literature [2] and this study at different compositions. Activity coefficients for methyl ethyl ketone: g, (exp.…”

“…Comparison of the measured data with UNIFAC and UNIQUAC predictions for toluene (1) þ acetic acid (2) and toluene (1) þ methyl ethyl ketone (2) has been shown in Tables 7 and 8, respectively. The UNIFAC model gave better results than the Note: Liquid-phase mole fraction: x 1 , vapour-phase mole fraction: y 1 and activity coefficients for: methyl ethyl ketone (1) þ toluene (2) binary systems at 101.3 kPa.…”

“…); Á, (lit.) [2]. Physics and Chemistry of Liquids 623 toluene (1) þ acetic acid (2) binary system are found to be 0.0008 for UNIFAC, 0.0027 for NRTL, 0.0036 for WILSON, 0.0037 for UNIQUAC ( Table 9).…”

“…Steinhauser and White [2] illustrated the application of the Gibbs-Duhem equation to non-ideal data-determined (toluene þ methyl ethyl ketone) binary sytems. Rivenq [3] also studied (vapour þ liquid) of the (toluene þ methyl ethyl ketone) at several different atmospheric pressures.…”

A modified quasi-chemical theory based on local composition.

“…(6) is not exactly equal to the interchange energy but if w may be substituted in Eqs. (2) and (3) 7]\2 =tx^(2wl2lzkT)= y]\1^f (7) j8u= 1)=/ (8) If it is assumed that the treatment according to the quasi-chemical approximation can be used in spite of non-constant w, then the excess Gibbs free energy per mole is given by3) RT JCiOS+ 1) 4-x2 lri x,(B+ l) (9) Although this equation seems to be the same as Eq. (1) …”