Thermodynamics Study of Rhenium Solvent Extraction Process from Sulfuric Acid Medium

In the rhenium solvent extraction process, molalities of perrhenate after extraction were measured from 278.15 to 303.15 K at impurity ionic strength from 0.2 to 2.0 mol·kg–1 in aqueous phase. Optimization condition of extraction was determined in this sulfuric acid medium. The standard extraction constants K0 at various temperatures were obtained by method of polynomial approximation. Thermodynamic quantities for the solvent extraction process were calculated.