Modelling the Solubility of Solid Aromatic Compounds in Supercritical Fluids

摘要

A cubic equation of state, GEOS, with quadratic mixing rules and two adjustable parameters was used to correlate solid - gas equilibrium data in 25 systems containing aromatic compounds and 3 supercritical fluids (ethane, fluoroform and trichloromonofluoromethane). The results are in good agreement with the experimental data for temperatures between 308 K and 343 K and pressures up to 360 bar. The adjustable parameters k_(ij) and l_(ij) used in the mixing rules vary linearly with the temperature or remain constant for the investigated systems. Based on this observation, the binary interaction parameters and hence, the solubility of the studied solid aromatic compounds in the supercritical fluids can be predicted.