Isobaric Vapor–Liquid Phase Equilibrium Measurements of the Dichloromethane–Titanium Tetrachloride System at 101,325 Pa

Abstract

Isobaric vapor–liquid phase equilibrium (VLE) data of the titanium tetrachloride (1) + dichloromethane (2) system were measured by a modified Rose equilibrium still at 101,325 Pa. Raman spectroscopy was employed to quantitatively analyze the concentrations of titanium tetrachloride and dichloromethane in the samples from the still. The Herington method and the McDermott–Ellis method were used to check the thermodynamic consistency of the experimental data, which were correlated by the Wilson and NRTL models to obtain binary interaction parameters. The results show that the calculated values of mole fraction of the vapor phase and boiling temperature by the Wilson and NRTL models agree well with the experimental data. Finally, the T–x–y diagram was drawn according to the VLE data and calculated data from the Wilson and NRTL models. There is a negative deviation of the new binary system from ideal solution and no azeotropic behavior was found. All these results could guide the separation of dichloromethane and titanium tetrachloride.