Abstract
In the solvent extraction system {R 3 N + NH 4 ReO 4 + n-C 7 H 16 + HCl + H 2 O}, the equilibrium molalities of ReO4 - were measured at ionic strength from (0.1 to 2.0) mol·kg -1 in the aqueous phase containing NH 4 CI as supporting electrolyte in the range of 278.15 K to 303.15 K. The standard extraction constants K 0 at various temperatures were obtained by methods of Debye-Huckel extrapolation and Pitzer polynomial approximation. Thermodynamic properties for the extraction process were calculated.
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