四种酸性萃取剂作为改性剂在TBP/FeCl3溶剂萃取体系中锂镁分离的比较研究,Industrial & Engineering Chemistry Research

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四种酸性萃取剂作为改性剂在TBP/FeCl3溶剂萃取体系中锂镁分离的比较研究
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-03-11 , DOI: 10.1021/acs.iecr.3c03764
Yifan Zhang _{1,

2} , Xiao Geng ₂ , Huining Deng ₁ , Zhuojun Jiang ₂ , Benzheng Xia ₂ , Liangrong Yang ₂ , Zheng Li _{2,

3}

Affiliation

TBP/FeCl ₃溶剂萃取(SX)系统在富镁盐水中对锂具有较高的选择性，但其存在锂剥离困难的问题。_{在TBP/FeCl 3}体系中添加2-乙基己基膦酸单-2-乙基己酯(P507)作为改性剂，通过控制Fe ³⁺配位，显着提高萃取体系的反萃取效率。然而，与 P507 类似的其他酸性萃取剂的性能尚未得到研究。在这项工作中，我们系统地比较了四种最常用的商业酸性萃取剂的性能，即 P507、二（2-乙基己基）磷酸（P204）、双（2,4,4-三甲基戊基）次膦酸（Cyanex 272） ) 和新癸酸 (Versatic Acid 10) 作为 TBP/FeCl ₃体系中的改性剂。结果发现，添加 P204、P507 或 Cyanex 272 会稍微抑制锂的提取，但 Versatic Acid 10 则不会；^{镁的共萃取遵循 P507 > P204 ≈ Cyanex 272 > Versatic Acid 10 的顺序。重要的是，改性剂将 Fe 3+}保留在有机相中的能力与其酸度相关，即 P204 > P507 > Cyanex 272 ≫ Versatic Acid 10。总体而言，P204 和 P507 表现出相当的性能，并且均超过了 Cyanex 272 和 Versatic Acid 10。

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Comparative Study of Four Acidic Extractants as Modifiers in the TBP/FeCl3 Solvent Extraction System for Lithium and Magnesium Separation

The TBP/FeCl₃ solvent extraction (SX) system exhibits a high selectivity of lithium over magnesium from magnesium-rich brines, but it suffers from the difficulty of lithium stripping. The addition of 2-ethylhexyl phosphonic acid mono-2-ethylhexy ester (P507) as a modifier to the TBP/FeCl₃ system significantly enhances the stripping efficiency of the extraction system by controlling the Fe³⁺ coordination. However, the performance of other acidic extractants similar to P507 has not yet been investigated. In this work, we systematically compared the performance of the four most commonly used commercial acidic extractants, namely, P507, di(2-ethylhexyl) phosphoric acid (P204), bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272), and neodecanoic acid (Versatic Acid 10) as modifiers in the TBP/FeCl₃ system. It was found that the addition of P204, P507, or Cyanex 272 slightly suppressed the extraction of lithium but Versatic Acid 10 did not; the coextraction of magnesium followed the order P507 > P204 ≈ Cyanex 272 > Versatic Acid 10. Importantly, the ability of the modifiers to keep Fe³⁺ in the organic phase is correlated with their acidity, i.e., P204 > P507 > Cyanex 272 ≫ Versatic Acid 10. Overall, P204 and P507 exhibited comparable performance, and they both surpassed Cyanex 272 and Versatic Acid 10.

更新日期：2024-03-11

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