Abstract

Lanthanum extraction from chloride-acetate solutions using mixtures of bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) and caprylic acid in hexane has been studied depending on the composition of aqueous and organic phases. Based on the results, it is found that the lanthanum extraction from chloride-acetate solutions proceeds according to a cation-exchange mechanism occurring in the organic phase with the prevailing formation of Cyanex 272 complexes solvated with caprylic acid molecules. It is shown that, when the process is carried out fusing acetic acid–acetate solutions, it is quite possible to separate lanthanum and ytterbium while attaining high separation coefficients.

中文翻译：

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在 Cyanex 272 和辛酸的混合物系统中从氯化物-乙酸盐溶液中提取镧

摘要

根据水相和有机相的组成，研究了使用双 (2,4,4-三甲基戊基) 次膦酸 (Cyanex 272) 和辛酸在己烷中的混合物从氯化物-乙酸盐溶液中提取镧。根据结果​​，发现从氯化物-乙酸盐溶液中提取镧是根据有机相中发生的阳离子交换机制进行的，主要形成与辛酸分子溶剂化的 Cyanex 272 络合物。结果表明，当该过程进行醋酸-醋酸盐溶液熔融时，很有可能在获得高分离系数的同时分离镧和镱。