Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

doi:10.1016/j.cjche.2017.06.022

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (2): 317-321.DOI: 10.1016/j.cjche.2017.06.022

• Catalysis, Kinetics and Reaction Engineering • 上一篇下一篇

Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

Zhuo Chen, Yundong Wang

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2017-02-17 修回日期:2017-06-14 出版日期:2018-02-28 发布日期:2018-03-16
通讯作者: Yundong Wang
基金资助:
Supported by the National Natural Science Foundation of China (21476121, 21322604), NSAF (U1530107), the Natural Science Foundation of Beijing (2162020) and Tsinghua University Initiative Scientific Research Program (2014z21026).

Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

Zhuo Chen, Yundong Wang

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2017-02-17 Revised:2017-06-14 Online:2018-02-28 Published:2018-03-16
Contact: Yundong Wang
Supported by:
Supported by the National Natural Science Foundation of China (21476121, 21322604), NSAF (U1530107), the Natural Science Foundation of Beijing (2162020) and Tsinghua University Initiative Scientific Research Program (2014z21026).

摘要/Abstract

摘要： Solvent extraction kinetics of Sm (Ⅲ), Eu (Ⅲ) and Gd (Ⅲ) from hydrochloric acid have been focused on using 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) with Anordning for Kontinuerlig Undersokning av Fordelningsfaktore vid Vatske Extraction (AKUFVE). Compared with the conventional set-up, some advantages emerge obviously, for example, fast phase separation, easy operation and convenience of kinetic data acquisition. First of all, the extraction mechanism was discussed based on the dimeric model of P507. Secondly, the effects of stirring speed were investigated and 420 r·min^-1 was determined of the following experiments. The effects of pH, concentration of rare earth elements (REEs) and P507 on the extraction rate were analyzed. The results indicated that the extraction mechanism changed with the increasing concentration of P507. Then, the experiments with different temperature were carried out. It turned out that the values of apparent activation energy (E_a) for Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) extracted by P507 were 26.80 kJ·mol^-1, 13.40 kJ·mol^-1 and 11.10 kJ·mol^-1 respectively, the resistance of the entire process was limited by diffusion or both of diffusion and reaction. Finally, the correlation equations were obtained, and the theoretical results fit with the experimental data well, most relative error was within ±30%.

关键词: Rare earth elements (REEs), Extraction, Kinetics, Model

Abstract: Solvent extraction kinetics of Sm (Ⅲ), Eu (Ⅲ) and Gd (Ⅲ) from hydrochloric acid have been focused on using 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) with Anordning for Kontinuerlig Undersokning av Fordelningsfaktore vid Vatske Extraction (AKUFVE). Compared with the conventional set-up, some advantages emerge obviously, for example, fast phase separation, easy operation and convenience of kinetic data acquisition. First of all, the extraction mechanism was discussed based on the dimeric model of P507. Secondly, the effects of stirring speed were investigated and 420 r·min^-1 was determined of the following experiments. The effects of pH, concentration of rare earth elements (REEs) and P507 on the extraction rate were analyzed. The results indicated that the extraction mechanism changed with the increasing concentration of P507. Then, the experiments with different temperature were carried out. It turned out that the values of apparent activation energy (E_a) for Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) extracted by P507 were 26.80 kJ·mol^-1, 13.40 kJ·mol^-1 and 11.10 kJ·mol^-1 respectively, the resistance of the entire process was limited by diffusion or both of diffusion and reaction. Finally, the correlation equations were obtained, and the theoretical results fit with the experimental data well, most relative error was within ±30%.

Key words: Rare earth elements (REEs), Extraction, Kinetics, Model

Zhuo Chen, Yundong Wang. Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester[J]. Chinese Journal of Chemical Engineering, 2018, 26(2): 317-321.

Zhuo Chen, Yundong Wang. Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester[J]. Chin.J.Chem.Eng., 2018, 26(2): 317-321.

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Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

Solvent extraction kinetics of Sm(Ⅲ), Eu(Ⅲ) and Gd(Ⅲ) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

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