The solubility of heavy compounds in gaseous phase containing a supercritical component (solid-gas equilibrium) was analised. It was adopted the state equation of Peng-Robinson, to represent the solid-gas systems considered. The model was applied to several cases ranging from binary systems (mono-solid/mono-solvent) to multi-solid/multi-solvent systems. For each system, it was done the estimation of pertinent parameters, the binary interaction parameters, obtained by non-linear regression from experimental data of correspondent solid-gas equilibrium. Using the results obtained from binary systems, predictions of selectivity/capacity for ternary systems like 2 solids-1 solvent were accomplished, and then a comparison with experimental data of ternary systems was achieved.
Supercritical carbon dioxide; Peng-Robinson; selectivity; capacity
