Vapour–Liquid Equilibria in the Polystyrene + Toluene System at Higher Concentrations of Solvent

J. Pavlíček, G. Bogdanić and I. Wichterle

Abstract
Vapour–liquid equilibria (VLE) were determined in the polystyrene + toluene system under isothermal conditions at 363.15, 373.15, and 383.15 K using an improved all-glass microebulliometer with circulation of the liquid phase for the dynamic measurement of total pressure over liquid mixtures. The experimental data were correlated using the UNIQUAC-free volume model and the applicability of three known predictive models was tested. It was found that prediction of VLE using the GC-Flory equation of state, the UNIFAC-vdw-FV and the Entropic-FV model are of the same quality.

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Keywords
vapour–liquid equilibrium, polymer–solvent system, ebulliometer, experimental data, correlation