Application of super-microporous MOF adsorbent material in hydrocarbon gas separation

A technology for the separation of hydrocarbon gases and gases, applied in separation methods, dispersed particle separation, alkali metal oxides/hydroxides, etc., can solve the problems of MOF adsorbent particles, mechanical properties and adsorption properties that have not been obtained. Performance cannot meet the needs of practical applications, the adsorption performance of shaped particles cannot be satisfied, etc., to achieve the effect of process optimization, consistent particle size, and small pore size

Active Publication Date: 2021-04-30
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

At present, MOF molding technology is less, and it is used to separate gas C 2 h 4 / C 2 h 6 The ZIF-7MOF adsorbent of the system is a powder. In the prior art, there is no molding method for obtaining MOF adsorbent particles with better mechanical properties and adsorption properties and the separation of molded particles. 2 h 4 / C 2 h 6 application case
The molding method of the adsorption material ZIF-8 in the prior art with the application number of 201310163131.7 requires the use of a peptizer, and it is suitable for molecules with a large molecular radius and has good adsorption performance, but it is not suitable for the MOF adsorption of gas separation of low-carbon hydrocarbons. However, its mechanical properties and adsorption properties cannot meet the needs of practical applications; application number 2013105586433.3 uses two kinds of binders, organic binder and inorganic binder, and the binder used will enter the MOF pores, which is not suitable for small MOF adsorbent with pore size; although the MOF adsorbent with application number 201510560984.3 is used for alkane adsorption, it is more involved in the adsorption and separation of C4-C11 alkanes, and the separation of low-carbon alkane gases has a higher selectivity to the adsorbent The mechanical strength and reduce the loss of adsorption capacity, the adsorption performance of the shaped particles prepared by it can not meet the actual production needs of adsorption and separation of low-carbon alkanes

Method used

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  • Application of super-microporous MOF adsorbent material in hydrocarbon gas separation
  • Application of super-microporous MOF adsorbent material in hydrocarbon gas separation
  • Application of super-microporous MOF adsorbent material in hydrocarbon gas separation

Examples

Experimental program
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Effect test

Embodiment 1

[0031]This method uses a PVA + MC composite method,

[0032]First, the preparation of the aqueous solution of PVA is carried out, and the preparation method is:

[0033]It is weighing 1 g of PVA particles in a beaker equipped with 10 ml of deionized water, heating is stirred for 1 hour, the heating temperature is 90 ° C, so that the PVA is completely dissolved in water, and the concentration is 0.1 g / ml gel liquid;

[0034]The ziF-7 is formed, the steps are as follows:

[0035]1 Weigh 0.92 g of ZIF-7 powder in a beaker, stir well;

[0036]2 Add a pre-referred amount of 0.03 g of MC powder, stir well, mix well;

[0037]3 Add 0.5 ml of the above-mentioned prepared PVA aqueous solution to the mixed powder in step 2, stir well, mix well;

[0038]4 The paste formed, extruded by the syringe, molded granulation, room temperature, gave spherical particles having a particle diameter of 3 mm;

[0039]figure 1 The protected ziF-7 crystal structure is maintained compared to the original powder, and the XRD peak rema...

Embodiment 2

[0041]Improve the embodiments, increase the content of the MC, steps below:

[0042]1 Weigh 0.9 g of ZIF-7 powder in a beaker, stir well;

[0043]2 Add a pre-referred amount of 0.05 g of MC powder, stir well, mix well;

[0044]3 Add 0.5 ml of the above-mentioned prepared PVA aqueous solution to the mixed powder in step 2, stir well, mix well;

[0045]4 The paste formed, extruded by the syringe, molded granulation, room temperature, gave spherical particles having a particle diameter of 3 mm;

[0046]The spherical particle mechanical strength obtained by the above method reaches 68 N / , and the adsorption properties of 298K and 1BAR are compared to the primary powder, the adsorption performance can maintain the original adsorption performance, the same as the PVA forming method, and the separation performance is close to The structural stability is 550 ° C, which can fully meet the actual needs of the industrial.

Embodiment 3

[0048]Improvement in Example 2 increased by an MC content to 7%, steps as follows:

[0049]1 Weigh 0.88g ZIF-7 powder in a beaker, stir well;

[0050]2 Add a pre-referred to 0.07 g of MC powder, stir well, mix well;

[0051]3 Add 0.5 ml of the above-mentioned prepared PVA aqueous solution to the mixed powder in step 2, stir well, mix well;

[0052]4 The paste formed, extruded by the syringe, molded granulation, room temperature, gave spherical particles having a particle diameter of 3 mm;

[0053]The spherical particle mechanical strength obtained by the above method reaches 57 N / , the adsorption performance is poor, and the decrease is about 15%, and the thermal stability remains around 550 ° C.

[0054]byfigure 2 It can be seen that as the MC binder increases, the adsorption performance is gradually decreased, and the molded particle adsorption amount is only 10%, which can be realized than about 10% compared to ZIF-7 powder.2Hide6 / C2Hide4High efficiency separation.

[0055]FromFigure 4 It is seen t...

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Abstract

The invention relates to the field of application of a super-microporous MOF adsorbent material in hydrocarbon gas separation, in particular to application of super-microporous MOF adsorbent material forming particles in C2H6 / C2H4, the separation effect of the prepared and formed super-microporous MOF adsorbent material forming particles is tested in C2H4 / C2H6 mixed gas with the equal molar ratio, and the result shows that on the premise that high mechanical strength of the formed adsorbent particles is guaranteed, the adsorption capacity can also be maintained to be 89% of the original powder adsorption capacity, the separation effect is remarkable, the method is suitable for large-scale industrial application, polyvinyl alcohol and methyl cellulose are compounded to form MOF powder in the forming method, MOF spherical particles with high load rate are obtained, the powdery MOF adsorbent is effectively shaped via the method, and the obtained particles keep the crystalline structure of the original metal organic framework, so that the method is particularly suitable for the ultra-microporous MOF adsorbent; meanwhile, the technical effects of efficiently separating the ethane / ethylene mixture and obtaining high-purity ethylene in one step can be achieved.

Description

Technical field[0001]The present invention relates to an application of a super microporous MOF adsorbent material in a hydrocarbon gas separation, and in particular, in C2Hide6 / C2Hide4Application of application.Background technique[0002]Metal-Organic Frameworks, A General-Organic Frameworks, as a new type of functional material, because of its diverse topology network structure, in multi-phase catalysis, molecules and ion exchange, gas adsorption and separation, drug delivery, Proton conduction, photomagnetic and other fields show a good application prospect. Its effect in the field of gas separation also has attracted wide concerns. Ethylene (C2Hide4) It is an important oil and chemical basic raw material, and the production technology of ethylene is an important symbol of a national petrochemical development level. Traditional naphtha cleaves or new ethane dehydrogenated ethylene processes, will inevitably presence of ethane (C2Hide6Impurities. The physical properties and molecu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01D53/02
CPCB01J20/226B01J20/28019B01J20/28011B01D53/02Y02P20/50
Inventor 李金龙李立博王小青李晋平
Owner TAIYUAN UNIV OF TECH
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