Abstract
Interphase transfer kinetics of neodymium and nitric acid was studied using a single drop column with recycling organic phase: via an external mixing vessel in H2O-HNO3/NaNO3-Nd(NO3-) tri-n-butylphosphate system. Experimental data have been analyzed by two new concepts for driving forces for transport: synthesized linear and logarithmic forms. The former is defined as geometrical-mean driving force, and the latter is the logarithm of the product of reciprocals of concentration ratios: x/xe and: y/ye against equilibrium states in each phase,: i.e. In {(xe-ye)/(x-y)}. By applying thermodynamic logarithmic form of driving force along reaction coordinate, the net transfer fluxes of neodymium and nitric acid have been represented by chemical affinity under high ionic strengths over a wide range of solvent loading as flux=flux/(1—exp(—A/RT)).
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