Refractive Index and Vapor–Liquid Equilibrium Data for the Binary Systems of Anisole with Xylene Isomers at 93.13 kPa

Abstract

Phase equilibrium behavior of binary systems of anisole with xylene isomers was analyzed experimentally. An apparatus which establishes equilibrium conditions through continuous circulation of equilibrium vapor condensate and equilibrium liquid was used. Experimental data comprising refractive indices of binary mixtures, equilibrium compositions of vapor and liquid, and equilibrium temperature are reported for all binary systems. Thermodynamic consistency of vapor−liquid equilibrium data was established for using the Herington, Van Ness and absolute mean deviation tests. Interaction parameters of activity coefficient models, Wilson, nonrandom two liquid, and universal quasichemical, which are important for accounting nonideal behavior in process modeling, are also estimated through regression of the respective binary VLE data. Although VLE data shows that binary systems are nonazeotropic in nature, a pinch in the T−x,y plot indicates that separation of all binary system using distillation may need a significant number of stages.

Measurement and Correlation of Vapor–Liquid Equilibrium Data of the Toluene, o-Chlorotoluene, and p-Chlorotoluene System at 101.3 kPa

“…It is tough to separate o -chlorotoluene and p -chlorotoluene by traditional distillation. In addition to the close boiling points of o -chlorotoluene and p -chlorotoluene, it can be seen from the vapor–liquid equilibrium diagram that the T – y and T – x curves are very close . If a complete separation is to be obtained using distillation, a higher number of stages are required, resulting in higher energy consumption.…”

“…The comparisons of experimental data and calculated values for the three binary systems are shown in Figures 7−9 32 If a complete separation is to be obtained using distillation, a higher number of stages are required, resulting in higher energy consumption.…”