Adsorbent for lithium isotope separation and preparation method and application thereof

A lithium isotope and adsorbent technology, applied in the field of adsorbents for lithium isotope separation, can solve the problems of complex process, large organic solvent, difficult stripping, etc., and achieve the effects of environmental friendliness and simple preparation method.

Inactive Publication Date: 2016-12-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid-liquid extraction is an important method for chemical exchange separation of lithium isotopes. Although this method is easy to realize industrialized treatment, the process is complex and requires steps such as extraction, exchange and stripping, and it is difficult to strip and the extraction agent cannot be repeated. Issues such as use, consumption of large amounts of organic solvents and accumulation of waste

Method used

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  • Adsorbent for lithium isotope separation and preparation method and application thereof
  • Adsorbent for lithium isotope separation and preparation method and application thereof
  • Adsorbent for lithium isotope separation and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Pretreatment: wash the commercially available product XAD-7 with absolute ethanol for 3-5 times, and place it in a vacuum drying oven to dry overnight;

[0030] (2) Activation: Add 1.4g of XAD-7 into chloroform, sonicate at room temperature for 10 minutes, and then vibrate in a shaker for 10 minutes to obtain activated XAD-7;

[0031] (3) Dissolving and mixing: Weigh 0.6g of benzo-15-crown-5 into a 100mL round bottom flask, add 30mL of chloroform, ultrasonically dissolve benzo-15-crown-5 completely, and then mix with 1.4g of activated Mix and seal the porous polymer resin; then use a shaker to vibrate at 25°C for 24 hours; after the oscillation is over, move the system into a water bath and evaporate on a rotary evaporator at 25°C for 2 hours, then raise the temperature to 40°C, and continue Rotary evaporation for 1 hour, until the mixture was a loose powder, during this process, benzo-15-crown-5 entered the pores of the activated XAD-7 carrier through capillary act...

Embodiment 2

[0033] (1) Pretreatment: Wash commercially available XAD-7 3-5 times with absolute ethanol, and dry overnight in a vacuum oven;

[0034] (2) Activation: Add 1.2g of XAD-7 to nitrobenzene, sonicate for 10 minutes at room temperature, and shake in a shaker for 10 minutes to obtain activated XAD-7;

[0035] (3) Dissolving and mixing: Weigh 0.8g 4-nitrobenzo-15-crown-5 into a 100mL round bottom flask, add 30mL nitrobenzene, and ultrasonically make 4-nitrobenzo-15-crown-5 Completely dissolve, then mix with 1.2g activated porous polymer resin and seal well; then use a shaker to vibrate at 40°C for 30h; After steaming for 2 hours, raise the temperature to 80°C and continue rotary steaming for 1 hour until the mixture is a loose powder. During this process, 4-nitrobenzo-15-crown-5 enters into the activated XAD-7 carrier through capillary action The pores were finally dried at 50°C under vacuum for 24 hours to obtain a yellow and loose adsorbent.

Embodiment 3

[0037] (1) Pretreatment: commercially available Amberchrom TM CG-71 was washed 3-5 times and dried overnight in a vacuum oven;

[0038] (2) Activation: 1.0g Amberchrom TM CG-71 was added to 4-methyl-2-pentanone, sonicated at room temperature for 15 minutes, and then shaken in a shaker for 15 minutes to obtain the activated Amberchrom TM CG-71;

[0039] (3) Dissolving and mixing: Weigh 1.0g of 4-aminobenzo-15-crown-5 into a 100mL round bottom flask, add 30mL of 4-methyl-2-pentanone, and ultrasonically make 4-aminobenzo-15- Crown-5 was completely dissolved, then mixed with 1.0g of activated porous polymer resin and sealed; then shaken with a shaker at 30°C for 24h; After 2 hours of rotary evaporation under the same conditions, the temperature was raised to 50°C, and the rotary evaporation was continued for 1 hour until the mixture was a loose powder. During this process, 4-aminobenzo-15-crown-5 entered the activated Amberchrome through capillary action. TM In the pores of th...

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Abstract

The invention belongs to the field of lithium isotope separation, and in particular relates to an adsorbent for lithium isotope separation and its preparation method and application. The adsorbent is composed of porous polymer resin II and benzo-15-crown-5 compounds shown in formula (III), Wherein, R=H, nitro, amino, acrylamide, tert-butyl; the porous polymer resin II is XAD‑7, Amberchrom TM CG‑71, macroporous SiO 2 class carrier; the mass ratio of benzo-15-crown-5 compound and porous polymer resin II is 0.25-4. Its preparation method includes pretreatment, activation, dissolution and mixing. The adsorbent of the invention has a large separation coefficient for lithium isotopes, a simple preparation method, is easy to be applied in industry, and is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of lithium isotope separation, and in particular relates to an adsorbent for lithium isotope separation and its preparation method and application. Background technique [0002] Lithium is the lightest alkali metal element in nature, and there are many isotopes, among which 6 Li and 7 Li, two natural stable isotopes with abundances of 7.52% and 92.48%, are strategic materials required for nuclear fusion reactions. Tritium (T) required for fusion reactions is almost non-existent in nature and must rely on neutron bombardment 6 Li can produce and proliferate: [0003] [0004] while the heavy isotope 7 The absorption cross section of Li is extremely small (0.037b), not only as the core coolant and heat transfer agent of nuclear fusion reactor, but also as the medium of thorium-based molten salt, and in the main circuit of light water pressurized water reactor nuclear power plant as 7 LiOH·H 2 The O form acts as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01D59/26
CPCB01J20/26B01D59/26B01J20/22B01J2220/445B01J2220/4812
Inventor 叶钢刘飞刘栎锟霍晓梅陈靖
Owner TSINGHUA UNIV
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