Extraction behavior and third phase formation of neodymium(III) from nitric acid medium in N,N′-dimethyl-N,N′-dioctyl-3-oxadiglcolamide

The extraction behavior and the third phase formation of Nd(III) with an unsymmetrical diglycolamide (DGA), N,N ′-dimethyl- N,N ′-dioctyl-3-oxadiglcolamide (DMDODGA) in n -octanol/kerosene from the nitric acid medium was studied for the first time. The effects of the aqueous acidity, the DMDODGA concentration, and the temperature on the distribution ratio of Nd(III) were investigated. The dependence of the limiting organic concentration and critical aqueous concentration of Nd(III) on the concentrations of DMDODGA, n -octanol, and nitric acid was analyzed. The IR spectra of the loaded organic phase, the third phase of Nd(III), and the free extractant were analyzed.