Abstract
Extraction of mineral acids with methyltrioctylammonium dialkylphosphinate was studied, and the extraction ability of acids was shown to decrease in the series HNO3 ≫ HBr > HCl, which corresponds to anion-exchange series for the initial salts of quaternary ammonium bases (QAB). Extraction of lanthanum bromide with methyltrioctylammonium dialkylphosphinate was studied, the composition of extracted compounds was established, and extraction constants were calculated. The extraction ability of dinonylnaphthalenesulfonate was found to be considerably lower than that of QAB dialkylphosphinate because of a larger value of acid dissociation constant for dinonylnaphthalenesulfonic acid. It was shown that lanthanum in systems with binary extractants can be back extracted from organic phase with dilute solutions of mineral acids.
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Original Russian Text © V.V. Belova, A.I. Khol’kin, 2015, published in Zhurnal Neorganicheskoi Khimii, 2015, Vol. 60, No. 9, pp. 1270–1275.
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Belova, V.V., Khol’kin, A.I. Extraction of mineral acids and lanthanum salts with binary extractants. Russ. J. Inorg. Chem. 60, 1157–1162 (2015). https://doi.org/10.1134/S0036023615090053
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DOI: https://doi.org/10.1134/S0036023615090053