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The extraction behavior of Pr(III) has been investigated using four kinds of unsymmetrical diglycolamide (DGA) extractants having different alkyl chain lengths, namely N,N'-dimethyl-N,N'-didodecyldiglycolamide (DMDDdDGA), N,N'-diethyl-N,N'-didodecyldiglycolamide (DEDDdDGA), N,N'-dipropyl-N,N'-didodecyldiglycolamide (DPDDdDGA) and N,N'-dibutyl- N,N'-didodecyldiglycolamide (DBDDdDGA). The effect of the alkyl chain of amidic N atoms in DGAs on the extraction ability of Pr(III) is discussed. The extraction of hydrochloric acid and Pr(III) from hydrochloric acid medium by DGAs in sulfonated kerosene, toluene and octanol was studied. The effect of extractant concentration and diluents on the distribution ratio (D) of Pr(III) was investigated to understand the extraction mechanism. Pr(III) and Fe(III) can be separated very well by DMDDdDGA and DBDDdDGA diluted by toluene in hydrochloric acid solution. IR spectra of extracted species of DGA.HCl and DGA.Pr(III) were recorded to study the structure of the extracted species. [ABSTRACT FROM AUTHOR]

The behavior of Sm(III) and Nd(III) during extraction with N,N,N',N'-tetrabutyl-3-oxa-diglycolamide (TBDGA) in 70% kerosene--30 % n-octanol from hydrochloride acid was studied. The effects of temperature and the concentrations of hydrochloric acid and extractant on the distribution of the rare earth elements were investigated. The extraction mechanism was established and the stoichiometry of the main extracted species was confirm to be SmCl3•2TBDGA and NdCl3•2TBDGA for Sm(III) and Nd(III), respectively. The extraction distribution ratio decreased with increasing temperature, which demonstrates that the extraction reaction is exothermic. The IR spectra of the loaded organic phase and free extractant were recorded and are discussed. [ABSTRACT FROM AUTHOR]