SOLUBILITY OF HIGH MOLECULAR WEIGHTn-PARAFFINS IN SUPERCRITICAL CARBON DIOXIDE

摘要

A cubic equation of state, GEOS, with quadratic mixing rules and two adjustable parameters was used to calculate the solubilities of the high molecular weight n-paraffins in supercritical carbon dioxide. The results are in good agreement with the experimental data for temperatures between 308 K and 333 K and pressures up to 240 bar, for all the investigated systems. An important contribution of this study is the observation that the adjustable parameter k_(ij) varies linearly with the number of carbon atoms in the chain of the n-alkane and for the other parameter l_(ij) an average value can be considered at each temperature. Based on this observation, the binary interaction parameters and hence, the solubilities of other n-alkanes in the homologous series can be predicted.