Thermodynamic Insights on the Feasibility of Homogeneous Batch Extractive Distillation. 4. Azeotropic Mixtures with Intermediate Boiling Entrainer

Abstract

This paper shows how knowledge of the univolatility and unidistribution line location and residue curve analysis help to assess the feasibility of batch extractive rectifying or stripping distillation of azeotropic mixtures by using an intermediate boiling entrainer. We consider five minimum boiling (minT) azeotropic mixtures AB with entrainer E, namely, acetone–heptane with benzene, methanol–toluene with triethylamine, methyl acetate–cyclohexane with carbon tetrachloride, dichloromethane–ethanol with acetone, and ethyl acetate–heptane with benzene; and one maximum boiling (maxT) azeotropic mixture, namely, chloroform–ethyl acetate with either 2-chlorobutane, isobutylchloride, bromopropane, or bromochloromethane. All ternary diagrams A–B–E belong to the 1.0-1b class, for which all three possible univolatility, αAB, αBE, and αAE, and unidistribution lines, KA, KB, and KE can exist. With application of the general feasibility criterion of Rodriguez-Donis et al. (Ind. Eng. Chem. Res. 2009, 48 (7), 3544−3559)...