Abstract
The extraction of titanium(IV) from hydrochloric solutions by tributylphosphate (TBP) in carbon disulphide or carbon tetrachloride has been studied. Raman, infrared and ultraviolet spectra and chemical analysis of the organic phase have shown that the stoichiometry of the extracted complexes depends on the TBP concentration in the organic phase and on the acidity of the aqueous phase. In dilute solutions ([TBP]1 < 0.1 M) and in acid media ([HCl] (aq.)≈11 M), the compound extracted is (TBP) 2TiCl 4, identical with the complex formed in anhydrous media. When the acidity of the aqueous phase decreases, the (TBP) 2TiCl 4 complex is partially hydrolysed and the existence of species characterized by a [Cl -]/[Ti 4+] ratio inferior to 4.0 must be considered. Titanium(IV) in dilute solutions is extracted by concentrated TBP solutions (or pure TBP) as an entity different from (TBP) 2TiCl 4.
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