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Acetylene efficient separation material

A technology for separation materials and adsorption separation materials, applied in the field of high-efficiency separation materials for acetylene, can solve the problems of aggravating ethane/ethylene separation tasks, waste of ethylene products, small product synthesis amount, etc. The effect of growth, fast and accurate performance judgment

Active Publication Date: 2021-04-09
TAIYUAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, for MOFs with the above-mentioned functions, there are mainly the following problems: on the one hand, the preparation of MOF materials with related properties mainly stays in the laboratory stage and is subject to harsh preparation conditions. The amount of synthesis is small; on the other hand, due to the shape and size of the product, there is a problem of poor stability in the process of industrialization. How to improve its mechanical stability is also a difficult problem in its industrial application
However, in order to ensure that the concentration of acetylene in ethylene is reduced to below 10ppm, the selectivity is significantly reduced while maintaining a high conversion rate, and some ethylene products will be over-hydrogenated to ethane, which not only causes waste of ethylene products, but also Increased late-stage ethane / ethylene separation tasks

Method used

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preparation example Construction

[0045] A high-efficiency separation material for acetylene, the separation material contains chemical formula [Zn 2 (bpy)(btec)(H 2 O) 2 ]·2H 2 The metal organic framework material of O, the preparation method of described separation material comprises the following steps:

[0046] Step 1: Add zinc source, pyromellitic dianhydride and 4,4'-bipyridine into deionized water, and stir;

[0047] Step 2: Stir and mix evenly, add ammonia water or ammonium salt, and continue to stir for a period of time;

[0048] Step 3: After the reaction is completed, the obtained precipitate is filtered, washed and dried to obtain an isolated material.

[0049] Ammonia or ammonium salt is added during the synthesis process, which can form pyromellitic acid ammonium salt with pyromellitic dianhydride, accelerate the combination of pyromellitic acid ammonium salt with Zn ions in aqueous solution, and promote [Zn 2 (bpy)(btec)(H 2 O) 2 ]· 2 h 2 O grows rapidly and can increase [Zn 2 (bpy)(bt...

Embodiment 1

[0066] Add 0.150 kg of zinc acetate, 0.0764 kg of pyromellitic dianhydride and 0.0547 kg of 4,4'-bipyridine to 1.0 L of deionized water, stir and mix evenly, then add 2 mL of ammonia water with a mass concentration of 25%, And control the temperature at 25°C, keep stirring for 2 h, filter, wash with water / ethanol (1:1) mixed solution, and dry the obtained filter cake to obtain the product.

Embodiment 2

[0068] Add 0.150 kg of zinc acetate, 0.0764 kg of pyromellitic dianhydride and 0.0547 kg of 4,4'-bipyridine to 1.0 L of deionized water, stir and mix evenly, then add 2 mL of ammonia water with a mass concentration of 25%, And control the temperature at 50°C, keep stirring for 0.5 h, filter, wash with water / ethanol (1:1) mixed solution, and dry the obtained filter cake to obtain the product.

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Abstract

The invention relates to an acetylene efficient separation material, which comprises a Zn2(bpy)(btec) metal organic framework material. The specific preparation method comprises the following steps: adding a zinc source, pyromellitic dianhydride and 4,4'-bipyridine into deionized water, uniformly stirring and mixing, adding ammonia water, continuously stirring for a period of time, filtering and washing the obtained precipitate, and drying the filter cake to obtain the separation material. When the method is used for preparing the Zn2(bpy)(btec) organic framework material, high temperature and high pressure do not need to be adopted like hydrothermal synthesis, so that the preparation method is simpler, the product yield is high, and the method is suitable for industrial production; the separation material performance testing method and the forming method are provided, wherein the testing method can accurately evaluate the performance of the separation material, and the forming method is suitable for industrial application of separation materials; and compared with a traditional hydrothermal method, the method of the invention can achieve industrial large-scale production of mof, shows a more excellent trapping effect on efficient trapping of low-concentration acetylene, and has good application prospects and economic value.

Description

technical field [0001] The invention relates to gas separation technology, in particular to a high-efficiency separation material for acetylene. Background technique [0002] Metal-organic framework (MOF) materials have a highly ordered three-dimensional pore structure, finely adjustable pore size, and rich functional pore surfaces. In recent years, they have shown great application potential in the field of gas adsorption and separation, and can develop industrialized The preparation of MOF materials for separating and adsorbing low-concentration acetylene has great application prospects. However, in the prior art, for MOFs with the above-mentioned functions, there are mainly the following problems: on the one hand, the preparation of MOF materials with related properties mainly stays in the laboratory stage and is subject to harsh preparation conditions. The amount of synthesis is small; on the other hand, due to the shape and size of the product, there is a problem of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C07C7/12C07C11/24G01N15/08
CPCB01J20/226Y02P20/151
Inventor 李立博陈杨王小青李晋平
Owner TAIYUAN UNIV OF TECH
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