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Method for preparing ZIF-67 adsorbent by steam-assisted method and application of ZIF-67 adsorbent in cyclohexane adsorption

A ZIF-67, adsorbent technology, applied in the field of gas separation, can solve the problems of large solvent consumption, large waste liquid, low synthesis yield, etc., to save time and solvent, improve synthesis yield, and achieve selective adsorption Effect

Pending Publication Date: 2020-02-21
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For prior art problems, the object of the present invention is to provide a kind of steam-assisted method for preparing ZIF-67 adsorbent method and its application in cyclohexane adsorption, to solve the low synthetic yield of existing hydrothermal method, The consumption of solvent is large, and the problem of generating a lot of waste liquid

Method used

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  • Method for preparing ZIF-67 adsorbent by steam-assisted method and application of ZIF-67 adsorbent in cyclohexane adsorption
  • Method for preparing ZIF-67 adsorbent by steam-assisted method and application of ZIF-67 adsorbent in cyclohexane adsorption

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Effect test

Embodiment 1

[0023] (1) Co(NO 3 ) 2 ·6H 2 O and 2-methylimidazole are mixed evenly at a molar ratio of 1:x (4≤x≤6), then suspended and placed on the top of the crucible in a polytetrafluoroethylene-lined reactor, and a certain amount of The methanol (MeOH) solvent makes the methanol liquid level lower than the top of the crucible, and the mixture is located above the solution to ensure that the solid and liquid phases are at different heights without contacting each other. The solid mixture and solution are the precursors of ZIF-67;

[0024] (2) Cover and seal the stainless steel reaction kettle where the precursor is located in step (1), transfer the reaction kettle to a dry box and react at 130-150°C for 24-48 hours; when transferring the reaction kettle to the dry box, handle it gently Handle with care to ensure that the solid mixture at the top of the crucible in the kettle will not spill into the solution;

[0025] Centrifuge and wash the product obtained in step (2) after cooling ...

Embodiment 2

[0028] (1) Co(NO 3 ) 2 ·6H 2 O and 2-methylimidazole are mixed evenly at a molar ratio of 1:x (4≤x≤6), then suspended and placed on the top of the crucible in a polytetrafluoroethylene-lined reactor, and a certain amount of Acetone solvent (Ace), so that the acetone liquid level is lower than the top of the crucible, and the mixture is located above the solution to ensure that the solid and liquid phases are at different heights without contacting each other. The solid mixture and solution are the precursors of ZIF-67;

[0029] (2) Cover and seal the stainless steel reaction kettle where the precursor is located in step (1), transfer the reaction kettle to a dry box and react at 130-150°C for 24-48 hours; when transferring the reaction kettle to the dry box, handle it gently Handle with care to ensure that the solid mixture at the top of the crucible in the kettle will not spill into the solution;

[0030] (3) Centrifuge and wash the product obtained in step (2) after cooli...

Embodiment 3

[0033] (1) Co(NO3 ) 2 ·6H 2 O and 2-methylimidazole are mixed evenly at a molar ratio of 1:x (4≤x≤6), then suspended and placed on the top of the crucible in a polytetrafluoroethylene-lined reactor, and a certain amount of N,N-Dimethylformamide solvent (DMF), so that the DMF liquid level is lower than the top of the crucible, and the mixture is above the solution, ensuring that the solid and liquid phases are at different heights without contacting each other. The solid mixture and solution are ZIF-67 the precursor of

[0034] (2) Cover and seal the stainless steel reaction kettle where the precursor is located in step (1), transfer the reaction kettle to a dry box and react at 130-150°C for 24-48 hours; when transferring the reaction kettle to the dry box, handle it gently Handle with care to ensure that the solid mixture at the top of the crucible in the kettle will not spill into the solution;

[0035] (3) Centrifuge and wash the product obtained in step (2) after coolin...

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Abstract

The invention discloses a method for preparing a ZIF-67 adsorbent by a steam-assisted method and an application of the ZIF-67 adsorbent in cyclohexane adsorption. The preparation method for the adsorbent comprises the following steps: uniformly mixing Co(NO3)2.6H2O and 2-methylimidazole according to a certain ratio, suspending an obtained mixture into a polytetrafluoroethylene lining reaction kettle, allowing the mixture to be located above a solution, allowing a solid phase and a liquid phase to be located at different heights and not to be in contact with each other, and carrying out a reaction for 24 to 48 h at 130 to 150 DEG C; cooling a product, and carrying out washing and centrifuging so as to obtain a purple solid precipitate; then subjecting the precipitate to drying treatment soas to obtain a ZIF-67 adsorbent; and subjecting the adsorbent to vacuum drying at 150 to 180 DEG C so as to obtain an activated adsorbent. The method provided by the invention solves the problems of low synthesis yield, large solvent consumption amount and large waste liquid amount for a solvothermal method in preparation of the ZIF-67 adsorbent, is a green and environmentally-friendly synthesis method, and improves the synthesis yield of ZIF-67 at the same time.

Description

technical field [0001] The invention belongs to the technical field of gas separation, in particular to a method for preparing a ZIF-67 adsorbent by a steam-assisted method and its application in cyclohexane adsorption. Background technique [0002] In the past few decades, global warming caused by the emission of cyclohexane has caused serious threats to human beings and the natural environment, which has attracted worldwide attention. How to reduce CO 2 Emissions have become one of the current research hotspots. Post-combustion capture using solid sorbents such as zeolites is considered a promising technology for cyclohexane capture because of its energy and cost savings. However, the application of solid adsorbents is limited because the adsorption process is usually affected by operating temperature, water vapor, and other factors. The development of renewable adsorbent materials with high selectivity, adsorption capacity, and adsorption-desorption rate is crucial to...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02
CPCB01J20/226B01J20/28073B01J20/28066B01D53/02B01D2257/7022
Inventor 宋夫交曹燕刘阳庆陈天明杨百忍严金龙许琦
Owner YANCHENG INST OF TECH
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