A new semi-empirical model for correlation of solubility of ligands in supercritical carbon dioxide

Abstract

The solubility data of task specific ligands in supercritical carbon dioxide medium (scCO2) plays an important role in development of green separation methods for recovery of metal ions. However, experimental determination of solubility of these ligands at different process conditions is difficult, time-intensive and necessitating suitable model predictions. Many models are developed in the literature for the correlation of solubility of liquid and solid solutes in scCO2 medium. However, specific models for solubility correlation of ligands in scCO2 medium are not reported. Hence, in the present study, a new semi-empirical model was proposed to predict the solubility of ligands in scCO2 medium and is a modified version of existing Chrastil model. The correlation ability of new model was compared with existing density based models (Chrastil,