Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

doi:10.1016/j.cjche.2015.07.001

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (1): 79-85.DOI: 10.1016/j.cjche.2015.07.001

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Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

Hailong Hou¹, Jianhong Xu², Yundong Wang², Jinnan Chen¹

1 School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China;
2 The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2014-10-14 Revised:2015-06-08 Online:2016-02-23 Published:2016-01-28
Contact: YundongWang, Jinnan Chen
Supported by:
Supported by the National Basic Research Program of China (2012CBA01203), and the National Natural Science Foundation of China (90210034, 20221603).

Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

Hailong Hou¹, Jianhong Xu², Yundong Wang², Jinnan Chen¹

1 School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China;
2 The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

通讯作者: YundongWang, Jinnan Chen
基金资助:
Supported by the National Basic Research Program of China (2012CBA01203), and the National Natural Science Foundation of China (90210034, 20221603).

Abstract

Abstract: In order to clarify the extraction process with saponified extractant, the solvent extraction experiments of rare earth elements (REEs), lanthanum and cerium, by using partly saponified 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (EHEHPA, HL) from hydrochloric acidic solutions have been performed. The concentration of initial aqueous rare earth ion was in a range of 0.0010-0.1000 mol·L^-1; EHEHPA in a range of 0.2877-0.8631 mol·L^-1 with saponification rate of 0.3 (mole fraction), and the initial aqueous pH in a range of 1.00-4.00. Firstly, the extracted species were determined by the saturation extraction capacity method. Secondly, according to the equilibrium aqueous pH values, the extraction processes were divided into three different categories: extraction with saponified EHEHPA, extraction with un-saponified EHEHPA, and hydrolysis process. Finally, for the first two processes, in order to predict the distribution ratio, two semi-empirical calculation models were developed with. The calculation results are in good agreement well with the experimental data.

Key words: Partly saponified EHEHPA, Lanthanum, Cerium, Solvent extraction, Semi-empirical models, Equilibrium distribution

摘要： In order to clarify the extraction process with saponified extractant, the solvent extraction experiments of rare earth elements (REEs), lanthanum and cerium, by using partly saponified 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (EHEHPA, HL) from hydrochloric acidic solutions have been performed. The concentration of initial aqueous rare earth ion was in a range of 0.0010-0.1000 mol·L^-1; EHEHPA in a range of 0.2877-0.8631 mol·L^-1 with saponification rate of 0.3 (mole fraction), and the initial aqueous pH in a range of 1.00-4.00. Firstly, the extracted species were determined by the saturation extraction capacity method. Secondly, according to the equilibrium aqueous pH values, the extraction processes were divided into three different categories: extraction with saponified EHEHPA, extraction with un-saponified EHEHPA, and hydrolysis process. Finally, for the first two processes, in order to predict the distribution ratio, two semi-empirical calculation models were developed with. The calculation results are in good agreement well with the experimental data.

关键词: Partly saponified EHEHPA, Lanthanum, Cerium, Solvent extraction, Semi-empirical models, Equilibrium distribution

Hailong Hou, Jianhong Xu, Yundong Wang, Jinnan Chen. Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester[J]. Chin.J.Chem.Eng., 2016, 24(1): 79-85.

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Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

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