Experimental measurement and prediction by the UNIFAC and the DISQUAC models of the solid–liquid equilibrium diagrams of piperidine + benzene and piperidine + n -octane systems

This work is a continuation of our researches on the study of thermodynamic properties of organic compound mixtures and made up of two sections: an experimental section and a theoretical section. The experimental solid–liquid equilibrium diagrams of binary systems: piperidine + benzene and piperidine + n-octane, measured at atmospheric pressure, have been obtained by means of an apparatus derived from that of Smit. The advantage of this apparatus compared to that of Rossini and that of Jacob is the higher measurement accuracy and the low amount of product used. In the theoretical section, in addition to the calculation of the liquidus curves in the ideal case, the DISQUAC model and the Dortmund-UNIFAC method were applied to the two mixtures to predict the liquidus curves and make a comparison.