Extraction and separation of lithium isotopes by using organic liquid film extraction system of crown ether-ionic liquid

•The maximum single-stage separation factor α obtained in present study was 1.037.•The maximum abundance of 6Li in organic phase was reached 7.86 %.•The molar ratio of crown ether and Li+ complex is 1:1 was determined.•Lithium isotope exchange was spontaneous reaction at low temperatures. The organi...

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Published inFusion engineering and design Vol. 161; p. 112015
Main Authors Zhang, Zezheng, Jia, Yongzhong, Liu, Bing, Sun, Huaxin, Jing, Yan, Zhang, Quanyou, Shao, Fei, Qi, Mixiang, Yao, Ying
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.12.2020
Elsevier Science Ltd
Subjects
Crown ethers
Dibenzo-15-crown 5-Ether
Extraction and separation
Flow velocity
Gas flow
Ionic liquids
Ions
Lithium
Lithium ions
Lithium isotopes
Low temperature
Molecular chains
Organic liquid film
Organic liquids
Separation
Extraction and separation
Lithium isotopes
Organic liquid film
Dibenzo-15-crown 5-Ether
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Summary:•The maximum single-stage separation factor α obtained in present study was 1.037.•The maximum abundance of 6Li in organic phase was reached 7.86 %.•The molar ratio of crown ether and Li+ complex is 1:1 was determined.•Lithium isotope exchange was spontaneous reaction at low temperatures. The organic liquid film extraction system, a novel extraction system, was investigated for the extraction and separation of lithium isotopes using ionic liquid as the co-extractant and Dibenzo-15-crown 5-Ether (DB15C5) as the extractant. Multiple subjects were studied during the investigation, including the effects of extraction time; gas flow rate; temperature; counter anions of lithium salt; the length of the cationic carbon chain of ionic liquid on extraction, and separation of lithium isotopes. The maximum separation factor α was 1.037 ± 0.002 and the abundance of 6Li increased from 7.61 % to 7.86 %. Based on the slope analysis method, the formation of 1:1 complex [Li (DB15C5)]+ in the extraction phase was determined. The exchange of lithium isotope is spontaneous reaction at low temperatures (ΔH<0, ΔS<0). Also, the back-extraction times of lithium ions from extraction phase to aqueous phase were studied.
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ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2020.112015