A novel solvent extraction system was developed to separate Y³⁺ from Sr²⁺, where tributyl phosphate was chosen as an extractant and an organic solvent was a hydrophobic deep eutectic solvent (DES) consisting of oleic acid (OA) and 1-butyl-3-methylimidazolium chloride ([BMIM]Cl). The extraction experiment demonstrated that the extraction system using OA-[BMIM]Cl DES as an organic solvent exhibited great advantages of fast extraction and excellent selectivity for Y³⁺ (Y/Sr separation factor >500), which are hardly achieved in the extraction systems using conventional molecular solvent, for example, n-heptane. Density functional theory calculations also confirmed that the Y/Sr separation is more thermodynamically favorable in OA-[BMIM]Cl DES as an organic solvent compared to n-heptane. An extraction process comprising two-stage extraction, one-stage scrubbing, and one-stage stripping was proposed, achieving 95.06% of Y³⁺ selectively separated from a simulated solution and Y purity of 98.55% in the final product.

中文翻译：

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在新型低共熔溶剂介质中使用磷酸三丁酯增强 Y(III) 与 Sr(II) 的分离


开发了一种新型溶剂萃取系统来分离Y ³⁺和Sr ²⁺ ，其中选择磷酸三丁酯作为萃取剂，有机溶剂是由油酸（OA）和1-丁基-组成的疏水性低共熔溶剂（DES）。 3-甲基咪唑氯化物 ([BMIM]Cl)。萃取实验表明，以OA-[BMIM]Cl DES为有机溶剂的萃取体系表现出萃取速度快、对Y ³⁺选择性优异（Y/Sr分离因子>500）的巨大优势，这是萃取中很难实现的。使用常规分子溶剂（例如正庚烷）的系统。密度泛函理论计算还证实，与正庚烷相比，OA-[BMIM]Cl DES 作为有机溶剂，Y/Sr 分离在热力学上更有利。提出了两级萃取、一级洗涤、一级反萃的萃取工艺，从模拟溶液中选择性分离出95.06%的Y ³⁺ ，最终产品中Y的纯度达到98.55%。