Abstract

The isomolar series method was used to identify the regions of synergistic extraction of praseodymium and neodymium from low-acid nitrate solutions containing ammonium nitrate as a salting-out agent with isomolar mixtures of tri-n-octyl(methyl)ammonium nitrate and tri-n-butyl phosphate in toluene. The synergistic effect in the praseodymium extraction was detected for a limited range of mixture compositions, while in the case of neodymium extraction, this effect was manifested over the whole range of studied compositions. It was found that the chemistry of synergistic extraction is determined by the formation of a continuous sequence of mixed praseodymium or neodymium complexes, with antiparallel variation of the number of extractant molecules in the complexes and the extractant molar ratio. As the concentration of quaternary ammonium nitrate in the mixture increases, the phosphoryl groups of tri-n-butyl phosphate are replaced by the nitrate ligands of the quaternary salt, up to their complete displacement from the lanthanide coordination sphere.

中文翻译：

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甲苯中TOMAN-TBP混合物从硝酸盐溶液中溶剂萃取Nd（NO 3）3和Pr（NO 3）3的化学反应

摘要

使用了等摩尔系列方法，以从含硝酸铵作为与三的等摩尔混合物盐析剂的低酸硝酸盐溶液识别镨和钕的协同萃取的区域Ñ辛基（甲基）硝酸铵和三Ñ甲苯中的磷酸正丁酯。在有限范围的混合物组成中检测到in萃取中的协同作用，而在钕萃取的情况下，这种效应在整个研究的组合物中均表现出来。已经发现，协同萃取的化学作用是由混合的ase或钕配合物的连续序列的形成决定的，配合物中萃取剂分子的数量和萃取剂摩尔比呈反平行变化。硝酸季铵的混合物中的浓度增加，三-磷酰基Ñ丁基磷酸盐是由季盐，向上的硝酸盐的配体取代，以从镧系元素配位球的完整位移。