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Solvent Extraction of Zirconium and Hafnium with some Trifunctional Phosphine Oxides

The extraction of zirconium and hafnium from hydrochloric, perchloric and sulphuric acid solutions with [(C_6H_5)_2P(O)CH_2]_2P(O)C_6H_5 (L1), [(C_6H_5)_2P(O)CH_2]_2P(O)OC_2H_5 (L2) and [(C_6H_5)_2P(O)CH_2]_2P(O)OH (L3) has been studied. The properties of the ligands and the formation of the complexes with zirconium and hafnium as well as with perchloric acid have been investigated. The influence of the electronegativity of the substituent, bound to the central phosphorus atom, on the extraction of zirconium and hafnium has been discussed. From alcoholic solutions of metal tetrachlorides adducts with the phosphine oxides corresponding to the formula MeCl_4.L(n) (Me = Zr or Hf ; L(n) = ligand) have been isolated and characterized.

solvent extraction; zirconium; hafnium; phosphine oxides; trifunctional ligands

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