Preliminary studies of in-cell electrophoresis as 6Li enrichment technique

Barrado, Ana Isabel; Fernández, M.; Conde, Estefanía; Quejido, Alberto J.; Quiñones, J.; Sedano, L.

doi:10.1016/j.fusengdes.2010.11.028

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…The mercury amalgam method is the first industrial-scale application for lithium isotope separation. , However, the huge volumes of toxic mercury used in this technique bring about serious biological and environmental problems. To avoid the use of toxic mercury, many other techniques such as laser, , electromigration, − solvent extraction, − chromatography, − and membrane separation , have been developed. Among them, solvent extraction and chromatography methods using crown ethers or polymerized crown ethers as lithium isotope receptor have been proven to be an alternative method with favorable separation factor. ,, …”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polysulfone-graft-4′-aminobenzo-15-crown-5-ether for Lithium Isotope Separation

Yan¹,

Pei²,

Pei³

et al. 2015

Ind. Eng. Chem. Res.

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A novel polymer polysulfone (PSF)-graft-4′-aminobenzo-15-crown-5-ether (AB15C5) (PSF-g-AB15C5) for lithium isotope separation was prepared from PSF and AB15C5 as starting materials via nucleophilic substitution reaction. The chemical structure and properties of PSF-g-AB15C5 polymers were characterized by FT-IR, 1 H NMR, XPS, and TGA. The polymers obtained were used for lithium isotope separation by solid−liquid extraction. The effects of the immobilization amount of crown ether grafting on PSF, the type of counteranion of lithium salt, and the kind of solvent on the single stage separation factor were explored. Results showed that the single stage separation factor was only 1.002 ± 0.002 for AB15C5 in the traditional liquid−liquid extraction system of H 2 O−LiCl/CHCl 3 −AB15C5, whereas the single stage separation factor increased from 1.003 ± 0.001 to 1.015 ± 0.002 with the increase of the immobilization amount of crown ether from 0.23 to 0.79 mmol g −1 on PSF-g-AB15C5 polymers in the solid−liquid extraction system of CH 3 OH−LiCl/PSF-g-AB15C5 polymers. The order of the single stage separation factor obtained in different lithium salts was LiI > LiBr > LiClO 4 > LiCl. Further, the maximum value of single stage separation factor was 1.031 ± 0.002 for the extraction system of CH 3 NO 2 −LiCl/PSF-g-AB15C5 polymers. Moreover, 6 Li and 7 Li were enriched in the polymer phase and the solution phase, respectively.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polysulfone-graft-4′-aminobenzo-15-crown-5-ether for Lithium Isotope Separation

Yan¹,

Pei²,

Pei³

et al. 2015

Ind. Eng. Chem. Res.

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“…However, the abundances of 6 Li and 7 Li in nature are 7.53 and 92.47%, respectively . When 6 Li is utilized as a tritium breeding agent, the abundance must be over 30%. , The abundance requirement of 7 Li in the pH regulator of the PWR needs to be more than 99.92%, and the abundance requirement of 7 Li in the thorium molten salt reactor needs to be more than 99.995% . Therefore, the enriched lithium isotope plays a vital role in the development and utilization of nuclear energy.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Novel Crown Ether System for Lithium Isotope Separation

Zhang

Jia

Liu

et al. 2021

Ind. Eng. Chem. Res.

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6 Li and 7 Li, with excellent nuclear properties, are important raw materials in the development of the nuclear industry. In the current work, a mercury-free extraction and lithium isotopic separation system with benzo-15-crown-5 (B15C5) ether as the extractant, ionic liquid as the co-extractant, and anisole as the diluent was constructed. In addition, a novel method for extracting lithium ions with B15C5 and multistage cross-flow separation of lithium isotopes by the organic liquid film were introduced. After 20 stages of cross-flow extraction, the abundance of 6 Li increased from 7.498 to 9.654% and the abundance of 7 Li increased from 92.502 to 93.561%. It was demonstrated that the B15C5 system not only can enrich 6 Li but also can serve to enrich 7 Li. The reason for the enrichment of lithium isotopes by this method was explored. Moreover, this study predicted the number of theoretical cross-flow stages of the abundance of 6 Li and 7 Li which can be used as a nuclear material.

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“…In the recent decades, many other techniques have been developed to separate the lithium isotope, such as electromigration, , laser, , electrochemical, , solvent extraction, − chromatography, , and membrane separation . Among them, solvent extraction and chromatography using crown ether as an extracting agent have been proven to be effective techniques for lithium isotope separation.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-graft-benzo-15-crown-5-ether/PVA Blend Membrane with Sponge-Like Pores for Lithium Isotope Adsorptive Separation

et al. 2018

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Crown ether exhibits a high separation coefficient for lithium isotope separation owing to its precise size selectivity to cations. A crown ether-based solid–liquid extraction method for the lithium isotope separation with a high extraction efficiency is regarded as a valid alternative to the classic liquid–liquid method. A chitosan- graft -benzo-15-crown-5-ether (CTS- g -B15C5)/polyvinyl alcohol (PVA) porous blend membrane for lithium isotope adsorptive separation was fabricated by immersion–precipitation–phase inversion. Results indicated that the finger-like structure of the blend membrane was replaced gradually by a sponge-like structure with the increase of the CTS- g -B15C5 concentration from 20 to 50 wt %. Meanwhile, the porosity and mechanical strength of the blend membrane slightly decreased from 76.9% and 2.68 MPa to 72.5% and 2.02 MPa, respectively, whereas the average pore size increased from 0.33 to 0.73 μm. The obtained CTS- g -B15C5/PVA (50/50 wt/wt) blend membrane exhibited a sponge-like asymmetrical gradient structure and good mechanical strength and used for the solid–liquid extraction experiment. It is found that the distribution coefficient increased from 13.50 to 49.33, and the single-stage separation factor increased from 1.008 to 1.046 with the immobilization amount of crown ether from 1.07 to 2.60 mmol·g –1 . It also meets the acceptable separation factor of 1.03 in a large scale of lithium isotope separation. In addition, 6 Li and 7 Li were enriched in the solid or membrane phase and the aqueous phase, respectively. In summary, the blend membrane has great potential applications in the development of green and highly efficient membrane chromatography for lithium isotope separation.

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Preliminary studies of in-cell electrophoresis as 6Li enrichment technique

Cited by 15 publications

References 41 publications

Preparation and Characterization of Polysulfone-graft-4′-aminobenzo-15-crown-5-ether for Lithium Isotope Separation

Preparation and Characterization of Polysulfone-graft-4′-aminobenzo-15-crown-5-ether for Lithium Isotope Separation

Characterization of a Novel Crown Ether System for Lithium Isotope Separation

Chitosan-graft-benzo-15-crown-5-ether/PVA Blend Membrane with Sponge-Like Pores for Lithium Isotope Adsorptive Separation

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