Abstract
The extraction of rhodium (III) chloro species has been investigated by using a trioctylmethylammonium chloride (R3R'NCl) in various diluents. The extraction isotherm decreases
The extraction isotherm decreases with increasing the acid concentration. The stoichiometric composition of the complex formed in the organic phase deduced to be (R3R'N) RhCl4(H2O)2. Therefore, the following mechanism is proposed for the extraction of rhodium (III) chloro species.
R3R'NCl (org) +RhCl4(H2O)2-(aq)⇔(R3R'N) RhCl4(H2O)2 (org)+Cl-(aq).
These results are also confirmed by visible and infrared spectral measurements.
In the examination of diluents effects, nitrobenzene and benzene most promoted the extraction of Rh (III) at 0.1 and 7 mol dm-3 hydrochloric acids, respectively.
The distribution ratio increases with increasing temperature.
