Vapor–Liquid Equilibria Prediction and Validation of Binary Systems Containing SiCl4 by Using the MOSCED Model

The measurement of olyzed VLE data of some binary system containing a deliquescent constituent is often difficult and time consuming. The MOSCED model was employed to predict the phase equilibria of the SiCl 4 –CS 2 and SiCl 4 –C 2 H 4 Cl 2 binary systems, which are easily hydrolyzed during the measuring process. The infinite dilution activity coefficients and activity coefficients of components of the SiCl 4 –CS 2 and SiCl 4 –C 2 H 4 Cl 2 binary systems were calculated. Then, VLE data and the VLE phase diagram of these binary systems were calculated using the trial-and-error method based on the obtained activity coefficients of the components of these binary systems. The calculated results are consistent with the experimental data within the allowable error. The result shows that the SiCl 4 –CS 2 binary mixtures have closer bubble and dew point curves than SiCl 4 –C 2 H 4 Cl 2 binary mixtures in the T – x –y phase diagram, which means that the SiCl 4 –C 2 H 4 Cl 2 system is much more easily separated by distillation. Meanwhile, the VLE data and VLE phase diagram of SiCl 4 –CS 2 and SiCl 4 –C 2 H 4 Cl 2 binary systems were used to guide the process of separating high-quality SiCl 4 from liquid waste originating from the titanium metallurgical industry.