Abstract
The current standard for the recovery of uranium from phosphoric acid is the so-called URPHOS process, where the solvent is a synergistic mixture of 0.5M di-2-ethyl-hexyl-phosphoric acid (HDEHP), which is used as a cation exchanger, and 0.125M tri-n-octyl-phosphine oxide (TOPO), which acts as a neutral donor.Here, the full synthesis of a novel family of “autosynergistic” molecules that contain a phosphoric acid group, similar to HDEHP, and a phosphine oxide group, similar to TOPO is described. These new bifunctional ligands were tested for the selective recovery of uranium(VI) from a 5M phosphoric acid solution. The association of components of HDEHP and TOPO (a cation exchanger+a neutral donor) in a single molecule improves uranium extraction and its selectivity over iron in comparison to a synergistic mixture of the extractants.
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