Abstract
In the preparative Craig distribution of Tb-nitrate between HNO3 and tributyl phosphate the method of lower phase withdrawal using 12m-HNO3 has been shown to be far superior to upper phase withdrawal; the superiority becomes even more marked as the atomic number of the rare earth element increases. From mixtures enriched in Tb by oxidation melting, Tb4O7 of more than 99% purity was separated, from which Tb4O7 of over 99.9% purity was obtained in 87% yield using up to 960 effective stages.
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Literatur
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Craig-Verteilung von Seltenerdnitraten im System Tri-n-butylphosphat—Salpetersäure, 5. Mitt.
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Rossmanith, K. Reindarstellung von Terbiumoxid durch Craig-Verteilung. Monatshefte für Chemie 105, 1025–1029 (1974). https://doi.org/10.1007/BF00910269
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DOI: https://doi.org/10.1007/BF00910269