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Synergetic Effects in the Extraction of Rare-Earth Ions by Mixed Organic Solvents. 1. The Systems of Benzyldibutylamine with Bis(2-ethyl-hexyl) Hydrogen Phosphate or Tributyl Phosphate

Ľ. Komorová and N.H. Tran

Department of Chemistry, Faculty of Metallurgy, Technical University, CS-043 85 Košice


Abstract: The objective of this paper was to determine the behaviour of the rare-earth ions during their extraction from the aqueous solutions by the organic extractants diluted in benzene. The organic extractant was either one-component (TBP, DEHPA, BDBuN) phase or a mixed (TBP-BDBuN or DEHPA-BDBuN) organic phase, always diluted with benzene.Experiments showed that distribution ratios of La, Pr, Nd, and Sm obtained when extracting with DEHPA-BDBuN mixed organic phase were much higher than the corresponding distribution ratios in case of single-component extractant (either DEHPA or BDBuN) and aqueous solution only in such a case when the salting-out agent (8.5 mol dm-3 NH4NO3) was added to it prior to extraction. The synergetic coefficients of each element tested were very high. Extraction by TBP-BDBuN mixed organic phase was somewhat less satisfactory although the synergetic effect was also observed. The magnitudes of the synergetic coefficients of each rare-earth ion were lower than in the previous case.

Full paper in Portable Document Format: 462a81.pdf


Chemical Papers 46 (2) 81–84 (1992)

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