Chemically Based Synergic Solvent Extraction Model for the System Nd(NO Sub 3 ) sub 3 -HDEHP-TBP-Benzene

摘要

A chemically based synergic solvent extraction model has been developed for the system Nd(NO sub 3 ) sub 3 -HDEHP-TBP-benzene. The model equation for the distribution ratio can be written as D/sub c/ = K sub 1 alpha sub 0 ((HG) sub 2 )/sub O exp 3 /(TBP)O exp 3 (H exp + )/sub A exp -3 /, where K sub 1 is the effective equilibrium constant containing the quotient of the activity coefficients of the reacting species and alpha sub 0 is the degree of formation of the neodymium complex in the equilibrated aqueous phase. ((HG) sub 2 ) sub 0 , (TBP) sub 0 , and (H exp + )/sub A/ denote the equilibrated HDEHP, TBP, and aqueous hydrogen ion concentrations, respectively. Experimental equilibrium distribution data generated in this work were used to test the model equation. Correlation coefficients between the experimental data and the predicted values are in the range of 0.899 to 0.983. (ERA citation 05:032644)