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Zeolitic imidazolate frameworks with immobilized ionic liquid in cages and application of zeolitic imidazolate frameworks

A zeolite imidazolate, ionic liquid technology, applied in separation methods, other chemical processes, dispersed particle separation and other directions, can solve the problems of unattainable selectivity and poor selectivity.

Inactive Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in our study, it was found that some ZIFs materials predicted to have a separation effect did not achieve the expected selectivity when applied to the separation of practical mixtures
For example, taking the ZIF-8 material as an example, the diameter of the six-element pore window is 0.34nm, and the cage diameter of sodalite (SOD) is 1.10nm. 2 (0.364nm) and CH 4 (0.38nm) while CO 2 (0.33nm) passed smoothly, that is to say, theoretically ZIF-8 material can be used for CO 2 / CH 4 , CO 2 / N 2 Separation, but in fact it is not the case, the study found that ZIF-8 for CO 2 / CH 4 , CO 2 / N 2 poor selectivity

Method used

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  • Zeolitic imidazolate frameworks with immobilized ionic liquid in cages and application of zeolitic imidazolate frameworks
  • Zeolitic imidazolate frameworks with immobilized ionic liquid in cages and application of zeolitic imidazolate frameworks
  • Zeolitic imidazolate frameworks with immobilized ionic liquid in cages and application of zeolitic imidazolate frameworks

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preparation example Construction

[0034] In a specific embodiment, the above-mentioned preparation method comprises the following steps:

[0035] (1) prepare ZIFs material and clean;

[0036] (2) Immerse the ZIFs material in the impregnating solution at 50°C-180°C for 1-96 hours, then wash and dry;

[0037] Wherein said impregnating solution is ionic liquid or by C 1-4 A mixed solution composed of low-carbon alcohol and ionic liquid in any proportion; preferably using C 1-4 A mixed solution with a low-carbon alcohol percentage not exceeding 95%;

[0038] (3) The product obtained in step (2) is cleaned and dried.

[0039] The lower carbon alcohol used in the dipping solution in the preferred step (2) is cleaned. After 3-5 times of washing, the product is dried at 30-100° C. for 12-48 hours to obtain the zeolite imidazolate framework material with ionic liquid immobilized in the cage of the present invention.

[0040] In yet another specific embodiment, ZIF-8 is used as a matrix material to prepare a ZIF-8 ...

Embodiment 1

[0048] Ionic liquid [BMIM][Tf immobilized in cages prepared by impregnation in mixed solvents at high temperature 2 N] ZIF-8 composite (composite IL 1 @ZIF-8), the specific synthesis steps are as follows:

[0049] (1) Preparation of parent material ZIF-8:

[0050] To 1.8g solid Zn(NO 3 ) 2 ·6H 2 O and 4.0g solid 2-methylimidazole (mim) mixture was added 100ml of anhydrous methanol, stirred for 30 minutes to fully dissolve the reactant and mixed uniformly, then the reaction mixture was left standing at room temperature for 24 hours. The formula for synthesizing ZIF-8 at room temperature is: Zn 2+ :xmIm:yCH 3 OH, where x is 8 and y is 400.

[0051] (2) Washing and drying of parent material ZIF-8:

[0052] The product obtained by the reaction is obtained by centrifugal separation, and ultrasonically cleaned with a large amount of anhydrous methanol three times, and the product and methanol washing solution are centrifugally separated after each ultrasonic cleaning. The r...

Embodiment 2

[0065] Immobilized ionic liquids in cages [BMIM][BF 4 ] ZIF-8 composite material, the specific synthesis steps are as follows:

[0066] (1) Preparation of parent material ZIF-8: same as step (1) in Example 1;

[0067] (2) washing and drying of parent material ZIF-8: same as step (2) in embodiment 1;

[0068] (3) Immobilized ionic liquid [BMIM][BF 4 ] ZIF-8 composite material, denoted as IL 2 @ZIF-8:

[0069] Add the dry ZIF-8 solid obtained in the above step (2) into ionic liquid [BMIM][BF 4 ] and butanol in a mixed solvent, where the ionic liquid [BMIM[BF 4 ] with butanol in a volume ratio of 8:2, and the volume fraction of butanol in the total volume is 20%, and then it is placed in a 100°C oven, the immersion temperature is 100°C, and the immersion time is 48 hours.

[0070] (4) Composite material IL 2 Drying of @ZIF-8:

[0071] The solid product obtained in step (3) is obtained by centrifugation, and ultrasonically cleaned with a large amount of anhydrous methanol ...

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Abstract

The invention discloses zeolitic imidazolate frameworks (ZIFs) with an immobilized ionic liquid in cages and an application of the ZIFs. The ZIFs provided by the invention are composite materials formed by the ionic liquid and ZIFs. According to the ZIFs provided by the invention, the ionic liquid is introduced into the hollow cages of the ZIFs to change the cage diameter and the gas adsorption performance of the ZIFs, so that the ZIFs have wider application prospects in the fields of gas selective adsorption and molecular precision screening.

Description

technical field [0001] The invention relates to a modified zeolite imidazolate framework material (ZIFs), especially a new material modified by using an ionic liquid and a preparation method thereof. Background technique [0002] The separation and purification of gas is a very important process in industrial production. At present, gas separation methods include low-temperature cryogenic separation, liquid absorption, membrane separation and adsorption. Among them, the industrial application of low-temperature cryogenic separation method is relatively mature, but the energy consumption is high and the cost is high; the industrial application of liquid absorption method is also relatively mature, but the regeneration of the absorbent generally requires a high temperature, high energy consumption and recovery of the absorbent. It is easy to have chemical pollution in the process of utilization. Gas membrane separation technology and adsorption separation technology have the ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01D53/02
CPCB01D53/02B01D2253/204B01J20/226B01J2220/4812
Inventor 杨维慎郭昂李砚硕班宇杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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