Abstract
The distribution of titanium (IV) between aqueous hydrochloric acid solutions and solutions of di-(2-ethylhexyl)-phosphoric acid (DEHPA) in kerosene or benzene has been investigated under different conditions. Infrared spectral measurement was made of the organic extract. As the results, it is found that the extraction of titanium (IV) at low aqueous acidity ([HCl] ≤ 3 mol dm-3) is governed by cation-exchange reaction and at higher acidity ([HCl] ≥ 3 mol dm-3) by a solvating reaction. At low acidity, the monomeric species is formed when the DEHPA is present in excess, but the extraction at higher titanium concentration proceeds in the reaction involving the formation of polymeric species.
From the extraction study under non-equilibrium conditions it is confirmed that the extraction at low and higher aqueous acidities is progressed by the SN1 mechanism.
