Comparison of naphthenic acid, versatic acid and d2ehpa for the separation of rare earths

Abstract

Equilibrium data are presented for the separation of selected rare earths Including La, Dy, Yb and Y, using solvent extraction from a chloride system. The solvents examined are Naphthenic acid, Versatic acid and D2EHPA in shellsol 2046 at 15°C. The data presented show that Yttrium has a similar distribution co-efficient to the heavy rare earths in D2EHPA but the distribution co-efficient is similar to the light rare earths in the carboxylic acid systems (Versatlc and Naphthenic acid). This indicates that carboxylic acids could be used to separate yttrium from heavy rare earths and in combination with D2EHPA for the separation from materials containing all the rare earths. © 1991, Taylor & Fr..