Does high hydrophilic complexing agent concentration enhance separation factors in “push-pull” extraction systems?

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2024-12-25 DOI:10.1016/j.seppur.2024.131263

Qi Zhao, Kaimin Shih

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Abstract

General equations describing the separation factors applicable to “push–pull” extraction systems using neutral and acidic organophosphorus extractants were derived. Factors affecting the separation factors, such as complexation constants, extraction equilibrium constants, counter anion concentration, extractant content, and hydrophilic complexing agent concentration, were elucidated. Specifically, for the extraction systems where the two target metal ions share the identical stoichiometry with the hydrophilic complexing agents, the separation factors continuously increase with higher concentration of hydrophilic complexing agent. In contrast, when their stoichiometries differ, the separation factor reaches extreme values depending on the hydrophilic complexing agent concentration. Additionally, carefully designed “push–pull” extraction systems were experimentally tested, to verify the predicted extremum behavior of the separation factor. This study offers new insights into optimizing separation efficiency while minimizing the costs associated with hydrophilic complexing agents, providing practical implications for industrial extraction processes.

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高亲水性络合剂浓度是否能提高“推拉式”萃取系统的分离系数？

推导了适用于中性和酸性有机磷萃取剂“推拉式”萃取体系的分离因子的一般方程。考察了络合常数、萃取平衡常数、反阴离子浓度、萃取剂含量、亲水性络合剂浓度等因素对分离因素的影响。具体而言，在两种目标金属离子与亲水性络合剂具有相同化学计量的萃取体系中，随着亲水性络合剂浓度的增加，分离因子不断增加。相反，当化学计量不同时，分离因子会随亲水性络合剂浓度的不同而达到极值。此外，精心设计的“推拉”萃取系统进行了实验测试，以验证分离因子的预测极值行为。该研究为优化分离效率，同时最大限度地降低亲水性络合剂的相关成本提供了新的见解，为工业提取工艺提供了实际意义。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.