The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(α-methylbenzyl) phenol

doi:10.1016/j.cjche.2021.07.001

中国化学工程学报 ›› 2022, Vol. 46 ›› Issue (6): 31-39.DOI: 10.1016/j.cjche.2021.07.001

The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(α-methylbenzyl) phenol

Dengke Pang^1,2, Zhihong Zhang¹, Yongquan Zhou¹, Zhenhai Fu¹, Quan Li¹, Yongming Zhang^1,2, Guangguo Wang^1,2, Zhuanfang Jing^1,2

1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2021-02-08 修回日期:2021-06-30 出版日期:2022-06-28 发布日期:2022-07-20
通讯作者: Yongquan Zhou,E-mail:yongqzhou@isl.ac.cn
基金资助:
Gratefully acknowledge to Hui-Juan Wang and Dr. Jing Wang for their assistance in element analysis. The research is financially supported by the Science and Technology Department of Qinghai Province (2019-ZJ-7001), West Light Foundation of the Chinese Academy of Sciences (Y910041014), Youth Innovation Promotion Association, CAS (2017467) and the Tibet A-Li La-Guo Resources Co. Ltd., China.

The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(α-methylbenzyl) phenol

Dengke Pang^1,2, Zhihong Zhang¹, Yongquan Zhou¹, Zhenhai Fu¹, Quan Li¹, Yongming Zhang^1,2, Guangguo Wang^1,2, Zhuanfang Jing^1,2

1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-02-08 Revised:2021-06-30 Online:2022-06-28 Published:2022-07-20
Contact: Yongquan Zhou,E-mail:yongqzhou@isl.ac.cn
Supported by:
Gratefully acknowledge to Hui-Juan Wang and Dr. Jing Wang for their assistance in element analysis. The research is financially supported by the Science and Technology Department of Qinghai Province (2019-ZJ-7001), West Light Foundation of the Chinese Academy of Sciences (Y910041014), Youth Innovation Promotion Association, CAS (2017467) and the Tibet A-Li La-Guo Resources Co. Ltd., China.

摘要/Abstract

摘要： Cesium (Cs) and rubidium (Rb) separation from brine is an important and application-oriented topic. 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP) has been used for Cs and Rb extraction. However, the traditional extraction technology is base and acid consumed. In the present work, an innovative process for Cs and Rb extraction with t-BAMBP is developed, which consists of saponification, extraction, scrubbing and stripping. Both infrared spectrum and electrostatic potential analysis indicate the hydrogen of phenolic hydroxyl is dissociated from t-BAMBP during saponification and the oxygen of phenolic hydroxyl is the binding site for alkali metal ions. Saponified organic phase shows an excellent extraction effect for Cs⁺ and Rb⁺. The extraction reaches equilibrium in 5 min, with 99.5% Cs⁺ and 46.7% Rb⁺ are loaded into the organic phase in the single-stage extraction. Slope method indicates the structure of the extraction complex is MOR·3ROH (M = Cs⁺, Rb⁺, K⁺), where the electrostatic attraction between M⁺ and the oxygen of phenolic hydroxyl is dominant, and the cation–π interaction has a significant effect also. The extraction complex of MOR·3ROH dissociates in the acid environment while scrubbing and stripping is completed. The Cs⁺ and Rb⁺ are separated from the mixture phase, the proton H bonds to the phenolic hydroxyl group, and the extractant is regenerated.

关键词: t-BAMBP, Optimization, Separation, Solvent extraction, Cesium, Rubidium

Abstract: Cesium (Cs) and rubidium (Rb) separation from brine is an important and application-oriented topic. 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP) has been used for Cs and Rb extraction. However, the traditional extraction technology is base and acid consumed. In the present work, an innovative process for Cs and Rb extraction with t-BAMBP is developed, which consists of saponification, extraction, scrubbing and stripping. Both infrared spectrum and electrostatic potential analysis indicate the hydrogen of phenolic hydroxyl is dissociated from t-BAMBP during saponification and the oxygen of phenolic hydroxyl is the binding site for alkali metal ions. Saponified organic phase shows an excellent extraction effect for Cs⁺ and Rb⁺. The extraction reaches equilibrium in 5 min, with 99.5% Cs⁺ and 46.7% Rb⁺ are loaded into the organic phase in the single-stage extraction. Slope method indicates the structure of the extraction complex is MOR·3ROH (M = Cs⁺, Rb⁺, K⁺), where the electrostatic attraction between M⁺ and the oxygen of phenolic hydroxyl is dominant, and the cation–π interaction has a significant effect also. The extraction complex of MOR·3ROH dissociates in the acid environment while scrubbing and stripping is completed. The Cs⁺ and Rb⁺ are separated from the mixture phase, the proton H bonds to the phenolic hydroxyl group, and the extractant is regenerated.

Key words: t-BAMBP, Optimization, Separation, Solvent extraction, Cesium, Rubidium

Dengke Pang, Zhihong Zhang, Yongquan Zhou, Zhenhai Fu, Quan Li, Yongming Zhang, Guangguo Wang, Zhuanfang Jing. The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(α-methylbenzyl) phenol[J]. 中国化学工程学报, 2022, 46(6): 31-39.

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The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(α-methylbenzyl) phenol

The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(α-methylbenzyl) phenol

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