Abstract
• First report on solubility of 2-hydroxyisobutyric acid in SCCO 2. • Solubility correlated with semi-empirical/empirical and equation of state models. • Development of supercritical method for recovery of actinide ions. • Demonstration of recovery of U and Th from aqueous/solid/cellulose matrix. The solubility of 2-hydroxyisobutyric acid in supercritical carbon dioxide is experimentally determined using a flow saturation technique. The experimental solubility data was generated at 308, 313, 318 and 323 K with pressures ranging from 10 to 20 MPa. The solubility data was found to range from 0.4 × 10 −3 mol·mol −1 to 5.7 × 10 −3 mol·mol −1 . The solubility data was correlated with two semi-empirical equations, Mendez-Santiago and Chrastil equation. The self-consistency of the data is verified with Mendez-Santiago model. Peng-Robinson equation of state combined with van der Walls mixing rules was also employed to correlate the solubility data. All three models have successfully correlated the solubility data with an average deviation of < 7%. Based on the solubility data, supercritical fluid extraction based method was developed for the recovery of uranium and thorium from solid/liquid matrices (cellulose matrix, uranyl and thorium nitrates, aqueous medium) using 2-hydroxyisobutyric acid as a ligand.
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