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Extraction system for separating lithium isotopes

A lithium isotope and extraction technology, applied in the field of lithium isotope separation, can solve the problems of expensive production equipment, difficult abundance, small yield, etc., and achieve the effects of shortening exchange equilibrium time, good synergistic extraction, and increasing abundance.

Active Publication Date: 2020-10-30
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the characteristics of expensive production equipment, harsh production conditions, high energy consumption but small output, the physical method is not suitable for industrial production
Lithium amalgam separation of lithium isotopes has great disadvantages. A large amount of mercury metal is used in the separation process, which brings ecological environment and safety problems. Countries such as Europe and the United States have closed down some factories that use lithium amalgam separation of lithium isotopes.
[0004] Since Pedersen et al. synthesized a series of crown ether compounds in 1967, researchers have found that certain crown ethers have a huge lithium isotope effect, and have a separation factor comparable to lithium amalgam in terms of separating lithium isotopes. However, in During the separation and enrichment of lithium isotopes by liquid-liquid extraction of crown ether solvents, 6 Every 0.1% increase in Li abundance is very difficult

Method used

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  • Extraction system for separating lithium isotopes
  • Extraction system for separating lithium isotopes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The extraction system for separating lithium isotopes provided in this example and the process for lithium isotope separation are as follows:

[0044] The extraction agent in the organic extraction phase is selected as benzo-15-crown-5, that is, the compound of the aforementioned formula 1-1; the ionic liquid is selected as 1-butyl-3-methylimidazolium tetrafluoroborophosphate [BMIm][BF 4 ], that is, the cation is selected as the compound of the aforementioned formula 2-9, and the anion is selected as [PF 4 ] - ; The diluent is selected as anisole.

[0045] The lithium salt of the lithium salt solution phase is selected as Li[NTf 2 ].

[0046] The preparation of the organic extraction phase is specifically: the ionic liquid [BMIm] [BF 4 ] and the diluent anisole are mixed with each other according to the volume ratio of 3:7, and then the extractant benzo-15-crown-5 is added to obtain an organic extract phase with an extractant concentration of 0.1mol / L.

[0047] The...

Embodiment 2

[0055] The extraction system for separating lithium isotopes provided in this example and the process for lithium isotope separation are as follows:

[0056] The extraction agent in the organic extraction phase is selected as 4-aminobenzo-15-crown-5, that is, the compound of the aforementioned formula 1-2; the ionic liquid is selected as N-butylpyridine bis(trifluoromethanesulfonyl)imide salt [BPy][NTf 2 ], that is, the cation selection is the compound of the aforementioned formula 2-1, and the anion selection is [(SO 2 CF 3 ) 2 N] - ; The diluent is selected as chloroform.

[0057] The lithium salt of the lithium salt solution phase is selected as CF 3 COOLi.

[0058] The preparation of the organic extraction phase is specifically: the ionic liquid [BPy][NTf 2 ] and the diluent chloroform are mixed with each other according to the volume ratio of 4:6, and then the extractant 4-aminobenzo-15-crown-5 is added to obtain an organic extract with an extractant concentration ...

Embodiment 3

[0067] The extraction system for separating lithium isotopes provided in this example and the process for lithium isotope separation are as follows:

[0068] The extractant in the organic extraction phase is selected as 4-bromobenzo-15-crown-5, that is, the compound of the aforementioned formula 1-2; the ionic liquid is selected as 1-butyl-3-methylimidazole bistrifluoromethanesulfonate imide salt [BMIm][NTf 2 ], that is, the cation selection is the compound of the aforementioned formula 2-9, and the anion selection is [(SO 2 CF 3 ) 2 N] - ; The choice of diluent is 1,1,2-trichloroethane.

[0069] The lithium salt of the lithium salt solution phase is selected as LiI.

[0070] The preparation of the organic extraction phase is specifically: the ionic liquid [BMIm] [NTf 2 ] and the diluent 1,1,2-trichloroethane are mixed with each other according to the volume ratio of 5:5, and then the extractant 4-bromobenzo-15-crown-5 is added to obtain an extractant concentration of 0....

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Abstract

The invention discloses an extraction system for separating lithium isotopes. The extraction system for separating the lithium isotopes comprises an organic extraction phase which is used for extracting and separating the lithium isotopes based on a flotation column and a lithium salt solution phase, and the organic extraction phase comprises an extraction agent, an ionic liquid and a diluent which are mixed with one another; the extraction agent is selected from one or more than two of compounds shown as the following formulas 1-1 to 1-7; the ionic liquid comprises negative ions and positiveions; the positive ions are selected from one or more than two of positive ions represented by the following formulas 2-1 to 2-10, and the negative ions are selected from one or more than two of [PF6]-, [(SO2CF3) 2N]-, [(SO2CF2CF3) 2N]-, [CF3SO3]-, [CH3COO]-and [BF4]-. According to the extraction system for separating the lithium isotopes, the abundance of 6Li single-stage separation can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium isotope separation, and in particular relates to an extraction system for separating lithium isotopes. Background technique [0002] Lithium (Li) exists in two stable isotopes in nature 6 Li and 7 Li, their natural abundance (referring to 6 Li and 7 The natural relative percentages of Li) are 7.42% and 92.58%, respectively, and these two isotopes play an extremely important role in the field of nuclear energy. Among them, the thermal neutron absorption cross section reaches 940b 6 After Li is bombarded and fissioned by neutrons (n), it can produce tritium and helium ( 6 Li+n→T+ 4 He), so a certain abundance 6 Li can be used as a raw material for nuclear fusion and other purposes; while the thermal neutron absorption cross section is only 0.037b 7 Li plays an important role in the regulation of nuclear reaction process and equipment maintenance. Nuclear fusion power supply is to use deuter...

Claims

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Application Information

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IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 姚颖张泽正贾永忠刘兵景燕张全有邵斐孙化鑫
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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