Method for separating lithium isotopes by coupling electric field and crown ether graft polymer porous membrane

A technology of grafting polymers and lithium isotopes, which is applied in the field of separation of lithium isotopes by electric field coupling crown ether grafted polymer porous membranes, can solve the problems of inability to obtain large separation factors, small single-stage separation factors, and difficulty in meeting ideal requirements. , to achieve the effect of small footprint, easy to enlarge, and stable operation

Inactive Publication Date: 2019-01-15
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, these methods have problems such as relatively small single-stage separation factors, which make it difficult to meet ideal requirements.
This is mainly due to the extremely small difference in physical and chemical interactions between isotopic ions, which makes it impossible to obtain a large separation factor regardless of the separation method.

Method used

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  • Method for separating lithium isotopes by coupling electric field and crown ether graft polymer porous membrane
  • Method for separating lithium isotopes by coupling electric field and crown ether graft polymer porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Aminobenzo 15-crown-5 grafted polysulfone porous membrane was immobilized in the diffusion cell, the diameter of the polymer membrane was 20 mm, and the number of layers of the polymer membrane was 6 layers. 6 Li + It has selective enrichment effect. Add a lithium iodide solution with a concentration of 1.0mol / L to the left side of the diffusion cell, insert a stainless steel electrode, add pure water to the right room and insert a titanium sheet electrode. The power supply voltage was set to 2.00V. After power on, take a water sample from the diffusion side every 10 minutes for testing, and the final separation result is 7 Li + The abundance is 90.18%, 6 The Li abundance is 9.82%.

Embodiment 2

[0020] The azabenzo 15-crown-5 grafted polysulfone porous membrane is fixed in the diffusion cell, the diameter of the polymer membrane is 20 mm, and the number of polymer membrane layers is 8 layers. 6 Li + It has selective enrichment effect. Add a lithium chloride solution with a concentration of 1.0mol / L to the left side of the diffusion cell, insert a stainless steel electrode, add pure water to the right room and insert a titanium sheet electrode. The power supply voltage was set to 2.00V. After power on, take a water sample from the diffusion side every 10 minutes for testing, and the final separation result is 7 Li + The abundance is 89.04%, 6 The Li abundance is 10.96%.

Embodiment 3

[0022] Aminobenzo12-crown-4 grafted polysulfone porous membrane is fixed in the diffusion cell, the diameter of the polymer membrane is 20mm, and the number of layers of the polymer membrane is 10 layers. 6 Li + It has selective enrichment effect. Add a lithium chloride solution with a concentration of 1.0mol / L to the left side of the diffusion cell, insert a stainless steel electrode, add pure water to the right room and insert a titanium sheet electrode. The power supply voltage was set to 2.50V. After power on, take a water sample from the diffusion side every 10 minutes for testing, and the final separation result is 7 Li + The abundance is 87.92%, 6 The Li abundance is 12.08%.

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Abstract

The invention provides a method for separating lithium isotopes by coupling an electric field and a crown ether graft polymer porous membrane. According to the method, a lithium isotope separation effect of the crown ether functionalized polymer membrane and a lithium isotope separation effect under the action of the electric field are coupled so as to enhance the lithium isotope separation effectof a system; specifically, the crown ether functionalized porous membrane with the lithium isotope separation effect is fixed in the middle of a diffusion cell, the two sides of the diffusion cell are provided with a lithium salt solution and pure water respectively, the selective adsorption effect of the functionalized membrane on <7>Li<+> is utilized, and <6>Li<+> is enriched on the pure waterside; and meanwhile, the <6>Li<+> has a higher migration rate under the action of the electric field, so that the migration rate of <6>Li<+> isotope ions towards the pure water side is increased, andfinally, green and efficient lithium isotope ion separation is realized.

Description

technical field [0001] The invention relates to an isotope separation method and the technical field, in particular to a method for separating lithium isotopes by an electric field coupling crown ether graft polymer porous membrane. Background technique [0002] Lithium is the lightest alkali metal element in nature, and it is widely used in metallurgy, ceramics, aerospace, medicine, chemical industry, textile, mining and national defense. Lithium exists in a variety of isotopes, among which 6 Li + and 7 Li + It is two natural stable isotopes, and its abundance is about 7.52% and 92.48% respectively. Both isotopes have important applications in nuclear energy. The tritium required for nuclear fusion reactions is almost non-existent in nature, and 6 Li + After being bombarded by neutrons, tritium and helium can be generated, so that tritium in the fusion reactor can continue to multiply, and it is an indispensable nuclear fusion reactor fuel. 7 Li + It is used as cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D59/50
CPCB01D59/50
Inventor 王明霞严峰李觊雪李建新裴洪昌孟祥宇
Owner TIANJIN POLYTECHNIC UNIV
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