Solvent extraction for lithium isotope separation by 4-NO2-B15C5/[BMIm][NTf2] system

被引：20

作者：

Mao, Lianjing ^{[1
,2
,3
]}

Zhang, Pengrui ^{[1
,2
,3
]}

Ju, Huiqun ^{[1
,2
,3
]}

Zhou, Xiaolong ^{[1
,2
,3
]}

Xue, Zixuan ^{[1
,2
,3
]}

Wang, Ciming ^{[1
,2
,3
]}

Sun, Jinhe ^{[1
,2
]}

Jia, Yongzhong ^{[1
,2
]}

Shao, Fei ^{[1
,2
]}

Zou, Xingwu ^{[1
,2
]}

Li, Bo ^{[1
,2
]}

Jing, Yan ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sal, Xining 810008, Peoples R China

[2] Qinghai Engn & Technol Res Ctr Comprehens Utilizat, Xining 810008, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2022年 / 367卷

关键词：

Solvent extraction; Lithium isotope separation; Thermodynamic; Kinetic; Multi-stage; Crown ether; TEMPERATURE IONIC LIQUIDS; BASES HSAB; SOFT ACIDS; KINETICS; MECHANISM; HARD;

D O I：

10.1016/j.molliq.2022.120357

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The evolution of the nuclear industry is inextricably linked to lithium isotopes. With its distinct benefits, the solvent extraction approach is projected to achieve industrial separation of lithium isotopes. However, the lack of studies on the extraction process conditions and mechanisms has limited the devel-opment of multi-stage processes. In this paper, based on the 4-NO2-B15C5/[BMIm][NTf2] system, the pro-cess conditions and extraction mechanism of the system were investigated by thermodynamic and kinetic studies. The results indicate that lithium isotope separation is a spontaneous exothermic process controlled by diffusion. In addition, DFT calculations show that the binding sites of crown ether and Li+ are located in the coronary heart of crown ether, and electrostatic and van der Waals forces mainly exist between them. On this basis, a 10-stage cross-flow extraction experiment was carried out using crown ether as the extractant. The aqueous phase feed solution is fully utilized, and the 7Li abundance is increased to 93.29 %. In summary, this research provides a foundation for the development of synergistic multi-stage extraction techniques in the future. (C) 2022 Elsevier B.V. All rights reserved.

引用

页数：12

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[12] Basic technology for 6Li enrichment using an ionic-liquid impregnated organic membrane [J].