Solvent Extraction of Rhenium in Ionic Liquid with N235

摘要

Extraction of rhenium into the ionic liquids phase from aqueous solutions was investigated using N235 as extractant. At temperatures from 293.15 to 318.15 K, the equilibrium molalities of ReO4- were measured at an ionic strength from 0.2 to 2.0 mol.kg(-1) in the aqueous phase containing NH4Cl as supporting electrolyte. The standard extraction constants K-0 at various temperatures were obtained by methods of the Pitzer polynomial approximation. Thermodynamic properties for the extraction process were calculated.