Abstract
An advanced method for the separation of praseodymium ions from a mixed solution of neodymium and praseodymium ions has been investigated, using a non-equilibrium extraction with diethylenetriaminepentaacetic acid (DTPA) and a bis-(2-ethylhexyl)phosphoric acid (B2EHPA)-kerosine system in which the largest value of the separation factor β Pr-Nd (= D Pr/ D Nd), i.e. 5.0, was obtained for the first time. It was found that the experimental extraction rate was represented by the reversible pseudo-first-order reaction as V = k 1″[H +] 2[Ln 3+] T,(a)- k −1″[H +][Ln 3+] (o) where subscript (a) and (o) represent aqueous and organic phases, respectively, and k 1″ and k −1″ are kinetic constants for the forward and backward reactions respectively.
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