Effect of structure on extraction behavior of praseodymium with a series of unsymmetrical diglycolamides from hydrochloric acid

Jixun Han, Xucan Cai, Guoxin Sun, Yu Cui

Abstract


Extraction behaviour of Pr(III) has been investigated with four kinds of unsymmetrical diglycolamide (DGA) extractants having different alkyl chain length, namely N,N’-di-methyl-N,N’-di-dodecyl diglycolamide (DMDDdDGA), N,N’-di-ethyl-N,N’-di-dodecyl diglycolamide (DEDDdDGA), N,N’-di-propyl-N,N’-di-dodecyl diglycolamide (DPDDdDGA) and N,N’-di-butyl-N,N’-di-dodecyl diglycolamide (DBDDdDGA). The effect of the alkyl chain of amidic N atoms in DGAs on extraction ability of Pr(III) has been discussed. The extraction of hydrochloric acid and Pr(III) from hydrochloric acid medium by DGAs in sulfonated kerosene, toluene and octanol was studied, respectively. 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.


Keywords


praseodymium (Pr); diglycolamide (DGA); rare earth; HCl; liquid–liquid extraction; distribution ratio

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DOI: https://doi.org/10.2298/JSC171109043H

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