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A class of ultramicroporous ionic polymer material and its preparation method and application

An ionic polymer and ultra-microporous technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of low absorption capacity, high viscosity, and difficult recovery of ionic liquids, and achieve enhanced molecular recognition capabilities and preparation The method is simple and the effect of efficient use

Active Publication Date: 2021-03-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the absorption capacity of ionic liquids is low, and due to the essential characteristics of liquid molten salts at room temperature, there are disadvantages such as high viscosity, slow mass transfer, and difficult recovery.

Method used

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  • A class of ultramicroporous ionic polymer material and its preparation method and application
  • A class of ultramicroporous ionic polymer material and its preparation method and application
  • A class of ultramicroporous ionic polymer material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Weigh 5g of 1,3,5-tris(bromomethyl)benzene and 4.35g of vinylimidazole, add them into 250mL of acetonitrile, mix and dissolve under stirring, and then heat to 50°C for 36 hours to react. The obtained product was filtered and washed with acetonitrile, and then vacuum-dried at 65°C for 24 hours to obtain a white solid, i.e. hyperbranched ionic liquid Ph-3MVIm-Br (Ph is a benzene ring group, 3 represents the number of hyperbranched, MVIm represents 1 -vinyl-3 methyleneimidazolium cation, Br is an anion), its molecular structure is shown in formula (2-1), and the yield is about 80%.

[0064]

Embodiment 2

[0066] Weigh 1.0 g of the hyperbranched ionic liquid Ph-3MVIm-Br obtained in Example 1 and 0.03 g of azobisisobutyronitrile into a mixed solution of 10 mL of ethanol and 5 mL of water, mix and dissolve under stirring, and then heat to 70 ° C for 12 hours . The obtained product P(Ph-3MVIm-Br) was filtered, washed with water and methanol, and then dried under vacuum at 65°C for 24 hours to obtain a white solid powder with a yield of about 85%. Such as figure 2 and image 3 As shown, the material in CO 2 (195K) as the medium, the measured Langmuir specific surface area is 244m 2 / g, the total pore volume is 0.104cm 3 / g, the aperture is Adsorbent P(Ph-3MVIm-Br) in N 2 (77K) as the medium, the specific surface area is only 10.0 m 2 / g. This result indicates that P(Ph-3MVIm-Br) is an ultramicroporous material. Such as Figure 4 As shown, the thermogravimetric results show that the material has excellent thermal stability, and the thermal decomposition temperature is as ...

Embodiment 3

[0072] Weigh 5g of 1,3,5-tris(chloromethyl)benzene and 6.95g of vinylimidazole, add them into 250mL of acetonitrile, mix and dissolve under stirring, and then heat to 50°C for 36 hours to react. The obtained product was filtered and washed with acetonitrile, and then vacuum-dried at 65° C. for 24 hours to obtain a white solid, namely hyperbranched ionic liquid Ph-3MVIm-Cl, with a yield of about 80%.

[0073] Weigh 1.0g hyperbranched ionic liquid Ph-3MVIm-Cl and 0.03g azobisisobutyronitrile into 10mL N,N-dimethylformamide and 5mL water mixed solution, mix and dissolve under stirring, then heat to 80 °C for 12 hours. The obtained product P(Ph-3MVIm-Cl) was filtered, washed with water and methanol, and then dried under vacuum at 65°C for 24 hours to obtain a white solid powder with a yield of about 80%. CO under 195K 2 The results of the adsorption isotherm show that the Langmuir specific surface area of ​​the material is 184m 2 / g, the total pore volume is 0.081cm 3 / g, the ...

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Abstract

The invention discloses an ultra-microporous ionic polymer material based on hyperbranched ionic liquid and preparation and alkyne / olefin separation application thereof. The ultra-microporous ionic polymer material has the characteristics of high anion density and narrow pore size distribution, and the structural properties are regulated and controlled by changing a hyperbranched structure and anion and cation types. High-selectivity separation of acetylene and propyne is realized by utilizing a strong hydrogen bond environment constructed by high anion density and a size screening effect, sothat alkyne in alkyne and olefin mixed gas is removed to a very low degree, and olefin gas with extremely low alkyne content is obtained. The material prepared by the method has the advantages of highstability, simple preparation, strong controllability of material structural properties, good adsorption performance, easy desorption, greenness, environmental protection, and good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a class of ultramicroporous ionic polymer materials and a preparation method and application thereof. Background technique [0002] Alkyne / alkene separation is an important separation process in the petrochemical industry. Ethylene is the basic raw material of the three major synthetic materials and is known as the "mother of the petrochemical industry". In 2016, the global output exceeded 170 million tons. In industry, acetylene impurities will inevitably be produced in production processes such as steam cracking, and the content is about 0.1% to 1% (mol fraction). Ethylene production requires removal of acetylene as low as 0.05ppm. The methods used in industry for the separation of acetylene and ethylene mainly include selective catalytic hydrogenation, solvent absorption, adsorption, and cryogenic separation. Such as the selective catalytic hydrogenation method (s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/34B01D53/06B01D53/04C08F126/06B01J20/30
CPCB01D53/04B01D53/06B01J20/261B01J20/3425C08F126/06Y02P20/54
Inventor 邢华斌锁显崔希利
Owner ZHEJIANG UNIV
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