Isobaric vapour-liquid equilibrium for binary and ternary systems of isopropyl acetate, isopropyl alcohol, acetic acid and water at 101.3 kPa

Abstract In order to obtain the vapour-liquid equilibrium (VLE) data of the binary and ternary systems related to the separation of thioglycolic acid (TGA) by-products, in this research, the VLE experimental data of four binary systems, (isopropyl alcohol + isopropyl acetate), (isopropyl alcohol + water), (acetic acid + isopropyl acetate) and (acetic acid + isopropyl alcohol), and two ternary systems, (isopropyl acetate + acetic acid + water) and (isopropyl alcohol + acetic acid + water), were determined using a Rose-type circulating distiller. Then, the Herington and van Ness method were adopted in order to test the thermodynamic consistency of the data obtained from the experiment. Simultaneously, the NRTL, UNIQUAC and Wilson activity coefficient models were used to correlate the determined VLE data. Due to the acetic acid presented, the HOC models were also used. In addition, the excess Gibbs free energy GE of the binary systems were measured to evaluate the non-idealities of the above systems. Finally, the binary interaction parameters of the thermodynamic models were measured, that can be adopted in design and optimization of the separation process of TGA by-products.