Thermodynamics of solvent extraction of perrhenate with tertiary isooctyl amine

摘要

In the solvent extraction system, the equilibrium molalities of ReO_4~- were measured at ionic strength from 0.2 to 2.0molkg~(-1) in the aqueous phase containing NH_4Cl as supporting electrolyte at temperatures from 278.15K to 303.15K. The standard extraction constants K0 at various temperatures were obtained by methods of Debye-Hückel extrapolation and Pitzer polynomial approximation. Thermodynamic properties for the extraction process were calculated.