Comparison of the Thermodynamics of Mixing of Titanium Tetrachloride and Tin Tetrachloride with Supercritical Carbon Dioxide

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Abstract
Previous studies show that tin tetrachloride and titanium tetrachloride mix readily with supercritical CO2. Comparison of these systems demonstrates significant differences in heats of mixing, mixture densities, and vapor-liquid equilibria. Although part of the difference may be attributable to the different densities of the pure solutes, there is some experimental and theoretical evidence that the intermolecular interactions between SnCl4 and CO2 are stronger than those between TiCl4 and CO2. These differences are consistent with the presence in tin of completed d and f orbitals which may affect interaction between SnCl4 and CO2.