Abstract
Extraction of vanadium (IV) from chloride solutions by di-(2-ethylhexyl)phosphoric acid (HDPA) in kerosene has been found to take place principally through the formation of neutral mononuclear vanadyl complexes with mono-ionized dimers of HDPA. No evidence has been obtained of chloro- or hydroxy-group participation in the extracted complex. At very high solvent loadings it appears that the extracted complex involves HDPA monomer rather than the dimer. Most effective extraction is obtained when the diluent has little or no propensity for forming hydrogen bonds with the HDPA.
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