Extraction of Rare-Earth Elements with Deep Eutectic Solvent Di(2,4,4-trimethylpentyl)phosphinic Acid/Phenol

IF 0.6 4区工程技术 Q4 ENGINEERING, CHEMICAL Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI:10.1134/S0040579525601062

I. V. Zinov’eva, T. Yu. Chikineva, S. A. Yakovleva, Yu. A. Zakhodyaeva, A. A. Voshkin

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Abstract

A hydrophobic deep eutectic solvent based on di(2,4,4-trimethylpentyl)phosphinic acid and phenol is proposed as an extractant for the separation of a number of rare-earth element ions from nitrate solutions. Experimental data on the interphase distribution of Pr, Nd, Tb, Dy, and Yb ions in the di(2,4,4-trimethylpentyl)phosphinic acid/phenol system are obtained with varying key process conditions: medium acidity, salting-out agent concentration, component ratio in the eutectic solvent, metal concentration, etc. The study establishes the mechanism of rare-earth-metal cation extraction by the proposed eutectic solvent and the composition of the extracted compounds using the tilt angle method. A study of metal ion re-extraction from the organic phase with mineral acid solutions is conducted, and the possibility of repeated use of the proposed eutectic solvent in chemical engineering processes is assessed. The obtained results indicate the potential of using the deep eutectic solvent di(2,4,4-trimethylpentyl)phosphinic acid/phenol for the extraction of rare-earth-metal cations in magnetic waste recycling processes.

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深共熔溶剂二（2,4,4-三甲基戊基）膦酸/苯酚萃取稀土元素

提出了一种以二（2,4,4-三甲基戊基）膦酸和苯酚为基料的疏水深共晶溶剂作为萃取剂，用于从硝酸盐溶液中分离稀土元素离子。在介质酸度、盐析剂浓度、共晶溶剂组分比、金属浓度等关键工艺条件下，获得了二（2,4,4-三甲基戊基）膦酸/苯酚体系中Pr、Nd、Tb、Dy、Yb离子相间分布的实验数据。用倾斜角法确定了稀土金属阳离子在共晶溶剂中的萃取机理和萃取物的组成。对无机酸溶液从有机相中再萃取金属离子进行了研究，并对所提出的共晶溶剂在化工过程中重复使用的可能性进行了评估。研究结果表明，采用二（2,4,4-三甲基戊基）膦酸/苯酚深共晶溶剂萃取稀土金属阳离子是可行的。

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来源期刊

Theoretical Foundations of Chemical Engineering 工程技术-工程：化工

CiteScore

1.20

自引率

25.00%

发文量

审稿时长

24 months

期刊介绍： Theoretical Foundations of Chemical Engineering is a comprehensive journal covering all aspects of theoretical and applied research in chemical engineering, including transport phenomena; surface phenomena; processes of mixture separation; theory and methods of chemical reactor design; combined processes and multifunctional reactors; hydromechanic, thermal, diffusion, and chemical processes and apparatus, membrane processes and reactors; biotechnology; dispersed systems; nanotechnologies; process intensification; information modeling and analysis; energy- and resource-saving processes; environmentally clean processes and technologies.