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Xenon/krypton adsorption separation method based on Hofmann type metal-organic framework material

An organic framework, adsorption separation technology, applied in separation methods, non-metallic elements, dispersed particle separation, etc., can solve problems that are difficult to meet the requirements, and achieve the effects of enhanced adsorption affinity, high separation selectivity, and excellent chemical stability

Active Publication Date: 2022-03-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the preparation of a MOFs material with ultra-high Xe / Kr separation selectivity, high chemical stability and radiation stability, and easy large-scale preparation is of great significance for the separation of xenon / krypton in the chemical industry, and it is also important for the design of materials. There are great challenges, and the currently reported materials are difficult to meet the requirements

Method used

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  • Xenon/krypton adsorption separation method based on Hofmann type metal-organic framework material
  • Xenon/krypton adsorption separation method based on Hofmann type metal-organic framework material
  • Xenon/krypton adsorption separation method based on Hofmann type metal-organic framework material

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Effect test

Embodiment 1

[0046] Dissolve 0.5 mmol of potassium tetracyanonickelate in water, 0.5 mmol of cobalt nitrate hexahydrate and 0.5 mmol of pyrazine in a methanol:water mixed solution with a volume ratio of 1:1, and then heat and stir at 30°C Under certain conditions, the potassium tetracyanonickelate solution was dropped dropwise into the mixed solution of cobalt nitrate and pyrazine, stirred for 3 hours, suction filtered after the reaction, and washed with deionized water and methanol in sequence to obtain ZJU-74-Ni .

[0047] The schematic diagram of the crystal structure of the material is shown in figure 1 , see the PXRD pattern figure 2 . The obtained homogeneous crystalline material was exchanged several times in anhydrous acetone by the solvent exchange method, with an interval of at least 2 hours each time, and then activated at room temperature for 24 hours, and then activated at 90°C for 12 hours to obtain ZJU- 74a—Ni.

Embodiment 2

[0049] Dissolve 0.5 mmol of potassium tetracyanopladate in water, 0.5 mmol of cobalt nitrate hexahydrate and 0.5 mmol of pyrazine in a methanol:water mixed solution with a volume ratio of 1:1, and then heat and stir at 30°C Under certain conditions, the potassium tetracyanopladate solution was dropped dropwise into the mixed solution of cobalt nitrate and pyrazine, stirred for 3 hours, suction filtered after the reaction, and washed with deionized water and methanol in sequence to obtain ZJU-74-Pd .

[0050] The schematic diagram of the crystal structure of the material is shown in figure 1 , see the PXRD pattern image 3 . The obtained homogeneous crystalline material was exchanged several times in anhydrous acetone by the solvent exchange method, with an interval of at least 2 hours each time, and then activated at room temperature for 24 hours, and then activated at 90°C for 12 hours to obtain ZJU- 74a-Pd.

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Abstract

The invention discloses a xenon / krypton adsorption separation method based on a Hofmann type metal-organic framework material, which comprises the following steps: by taking the Hofmann type metal-organic framework material as an adsorbent, enabling the Hofmann type metal-organic framework material to be in contact with mixed gas of xenon / krypton or dry air containing trace xenon / krypton, selectively adsorbing xenon in the mixed gas, and realizing separation of xenon and krypton; the structural general formula of the Hofmann type metal-organic framework material is M (L) [M '(CN) 4], M represents a divalent metal ion, L represents an organic ligand, and [M' (CN) 4] represents a tetracyano metal acid ion. The Hofmann type metal-organic framework material adopted by the invention has the advantages of ultrahigh xenon / krypton separation selectivity, ultrahigh chemical stability and irradiation stability, easiness in large-scale preparation and the like, and has practical application value in the field of xenon / krypton separation.

Description

[0001] The invention belongs to the technical field of gas separation, and in particular relates to a xenon / krypton adsorption separation method based on a Hofmann type metal-organic framework material. Background technique [0002] The separation of xenon and krypton is very important in industrial applications, and high-purity xenon and krypton are widely used in lighting, laser and medical equipment and other fields. The concentration of rare gases Xe (0.087ppmv) and Kr (1.14ppmv) in the atmosphere is extremely low, and they need to be enriched and purified before they can be used. In industrial production, there is a 20 / 80 (v / v) Xe / Kr mixture in the by-product of air separation, which requires further separation to produce high-purity xenon and krypton. In addition, the process of nuclear fission produces radioactivity 127 Xe and 85 Kr isotope, where 127 The Xe half-life is only 36.3 days, but 85 The half-life of Kr is as long as 10.8 years. These gases enter the atmo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/04C08G83/00B01J20/22B01J20/30C01B23/00
CPCB01D53/02B01D53/04C08G83/008B01J20/226C01B23/0057
Inventor 李斌刘笛钱国栋
Owner ZHEJIANG UNIV
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