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Fluorine-containing extractant and application thereof

An extraction agent and extraction technology, applied in the chemical industry, can solve problems such as experiments without multi-stage enrichment and separation, low extraction rate, operators and environmental hazards

Active Publication Date: 2014-11-12
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction agent reported in the invention patent application CN201110425430.4 has a low extraction rate, and the hydrophilic ionic liquid is expensive and difficult to recover by phase inversion, and there is no test for multi-stage enrichment and separation
However, the lithium amalgam method poses serious hazards to operators and the environment due to the large amount of mercury used
In addition, the lithium amalgam method is easy to enrich 6 Li, and lithium amalgam will gradually decompose in the extraction tower, so it is not suitable for more stages, 7 Separation process with high Li abundance (>99.99%)

Method used

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  • Fluorine-containing extractant and application thereof
  • Fluorine-containing extractant and application thereof
  • Fluorine-containing extractant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Embodiment 1 single-stage extraction separation test

[0152] extraction:

[0153] Extract the organic phase:

[0154] Extracting agent: 0.4mol / L; co-extractant: 0.2mol / L quaternary ammonium salt N263; diluent: chloroform.

[0155] Water phase: 0.2mol / L LiCl; 0.5mol / L NaOH

[0156] Comparison: 1:1 (volume ratio of organic phase to aqueous phase)

[0157] Extract the organic phase and aqueous phase into a separatory funnel and shake for 5 minutes, stand still for 5 minutes to separate layers, collect the two phases as the extracted organic phase and aqueous phase respectively; or use a high-efficiency centrifugal extractor to continuously extract at a flow ratio of 1:1 Feeding and discharging, the two phases obtained from the outlet are respectively used as the extracted organic phase and the aqueous phase.

[0158] in the organic phase after extraction 7 Li / 6 Li=14.350, in the water phase after extraction 7 Li / 6 Li=14.096, that is, the single-stage separatio...

Embodiment 2

[0162] Embodiment 2 single-stage extraction separation test

[0163] extraction:

[0164] Extraction method is the same as embodiment 1, and difference is to adopt following condition:

[0165] Extract the organic phase:

[0166] Extracting agent: 0.8mol / L; co-extractant: 0.4mol / L methyl tri-n-octyl ammonium bis(trifluoromethanesulfonyl)imide; diluent: chlorobenzene.

[0167] Water phase: 0.25mol / L LiOH; 0.2mol / L NaOH

[0168] Compared to: 1:1

[0169] The extraction distribution ratio D=3.4 was measured, that is, the primary extraction rate was 77%, and the single-stage separation coefficient α value was 1.016.

[0170] Stripping:

[0171] Back extraction method is the same as embodiment 1, and difference is to adopt stripping agent: 2mol / L H 2 SO 4 ; Three stripping rates were measured greater than 99%.

Embodiment 3

[0172] Embodiment 3 single-stage extraction separation test

[0173] extraction:

[0174] Extraction method is the same as embodiment 1, and difference is to adopt following condition:

[0175] Extract the organic phase:

[0176] Extracting agent: 0.12mol / L; co-extractant: 0.08mol / L quaternary ammonium salt N263; diluent: chloroform.

[0177] Water phase: 0.06mol / L LiOH; 0.6mol / L NaOH

[0178] Compared to: 1:1

[0179] The extraction distribution ratio D=1.6 was measured, that is, the primary extraction rate was 62%, and the single-stage separation coefficient α value was 1.019.

[0180] Stripping:

[0181] Back extraction method is the same as embodiment 1, and difference is to adopt stripping agent: 2mol / L H 2 SO 4 ; Three stripping rates were measured greater than 99%.

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Abstract

The invention relates to a fluorine-containing extractant for lithium isotope separation and application thereof. Specifically, the invention discloses a fluorine-containing extractant for lithium isotope separation shown as formula (I) and an extraction organic phase containing the extractant. Being cheap and easily available, the extractant has the characteristics of excellent chemical stability, and easy back extraction and regeneration cycle. The extraction organic phase has a high extraction rate on lithium ions and is easy to gather 7Li, thereby realizing separation of the lithium isotope.

Description

technical field [0001] The invention belongs to the field of chemical industry. Specifically, the present invention relates to a fluorine-containing extractant and its application. Background technique [0002] Lithium (Li) has two stable isotopes in nature, namely 7 Li and 6 Li accounted for 92.48% and 7.52% respectively. These two isotopes play an important role in the field of nuclear materials, but their nuclear reactivity properties are quite different. because 6 The thermal neutron absorption cross section of Li is very high (up to 941 barns), while 7 Li is only 0.033barns, so, in a thorium-based molten salt reactor, 7 As an essential molten salt coolant, Li requires an abundance of >99.995%. At the same time, high-purity 7 Li is often used to adjust the pH value of the primary coolant in pressurized water reactors; in fusion reactors 7 Li is also used as a heat carrier for heat conduction. On the other hand, neutron irradiation can be used 6 Li(n,α)T nuc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C245/08C22B26/12
CPCY02P10/20Y02P20/582
Inventor 胡金波张伟郑卫琴施啸徐永昌吕红贵袁承业
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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