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Synergetic Effects in the Extraction of Rare-Earth Ions by Mixed Organic Solvents. 2. The System of Tributyl  Phosphate with Bis(2-ethylhexyl) Hydrogen Phosphate

Ľ. Komorová and N.H.Tran

 

Abstract: The extraction of trivalent ions of La, Pr, Nd, and Sm from aqueous nitrate solutions was experimentally tested with the organic extractants diluted with benzene. The organic extractants were either one-component (TBP or DEHPA) or a mixed organic phase (TBP-DEHPA). The aqueous phase composition was 5 x 10-2 mol dm-3 of rare-earth ions and 0.5 mol dm-3 of HNO3. The objective of experiments was to find out if the presence of a salting-out agent (NH4NO3) enhanced extraction. This assumption was confirmed when extracting Sm, Pr, and La ions with TBP whereas the extraction of Pr and Sm ions with DEHPA was inhibited.The synergetic effect was discovered only in the case when the aqueous phase contained NH4NO3. By partial substitution of TBP by DEHPA in the extraction the distribution ratio of Pr and Sm decreased if the aqueous phase was free of the salting-out agent.The separation factors of each rare-earth ion tested were both calculated and verified experimentally.

Full paper in Portable Document Format: 463a174.pdf

 

Chemical Papers 46 (3) 174–177 (1992)

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