A carbon dioxide separation membrane and its application

A carbon dioxide and separation membrane technology, applied in the field of membrane separation, can solve the problems of membrane defects, easy agglomeration, poor dispersion uniformity, etc., and achieve the effect of improving stability and selectivity

Active Publication Date: 2022-01-18
湖南叶之能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) During the film forming process, the dispersion uniformity of nanoparticles in the mixed matrix film body is poor and easy to agglomerate;
[0007] (2) The size uniformity of nanoparticles is poor;
[0008] (3) The poor matching between the nanoparticle interface and the polymer interface leads to membrane defects, thereby reducing the separation efficiency of the membrane;
[0009] (4) Due to the poor dispersion uniformity, it is difficult to realize the defect-free large-scale preparation of the blended matrix gas separation membrane on a large scale, which limits the large-scale application;
[0010] (5) The inhibition effect caused by the simple blending method on the structural characteristics of nanoparticles is difficult to solve, which greatly reduces the separation efficiency of inorganic nanoparticles in the membrane body
[0011] The above technical problems generally exist in various types of mixed-matrix gas separation membranes currently developed, which seriously restrict the further improvement of the performance and large-scale application of gas separation membrane materials.

Method used

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  • A carbon dioxide separation membrane and its application

Examples

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Effect test

preparation example Construction

[0106] The preparation method of caged crown ether adsorption modified graphene in the embodiment of the present invention comprises the following steps:

[0107] Dissolve 18-crown-6 (CAS number: 17455-13-9; Hubei Kewode Chemical Co., Ltd.) in water to prepare a 18-crown-6 solution with a mass concentration of 0.01%~0.1%, and adjust it with hydrochloric acid The pH value of the solution is 2~3.

[0108] Put graphene in the prepared 18-crown-6 aqueous solution, stir at high speed (8000rmp~10000rpm) for 0.5h~1h at room temperature (20°C~30°C), then stir at low speed (500rmp~700rpm) for 8h~10h, Graphene is uniformly dispersed and saturated to adsorb 18-crown-6; a suspension containing 18-crown-6 and graphene is prepared.

[0109] The suspension containing 18-crown-6 and graphene is subjected to spray freeze-drying, and the freeze-drying temperature is -50~-30° C. to prepare 18-crown-6 modified graphene.

[0110] The preparation method of DL-2-amino-1-butanol adsorption modified...

Embodiment 1

[0116]This embodiment is a method for preparing a carbon dioxide separation membrane, comprising the following steps:

[0117] S1. Under high-speed shear (10000rpm), disperse 200.0g of cage-shaped crown ether-modified graphene (D50 is 10nm) in 790g of N, N-dimethylformamide (DMF), and stir for 2 hours to obtain cage-shaped crowns. Ether modified graphene dispersion;

[0118] Then, 10 g of polyvinylidene fluoride (solvay, PVDF9009) was added to the crown ether-modified graphene dispersion, stirred and heated to 80° C. to dissolve, and the dissolution time was 4 hours to obtain caged crown ether-modified graphene / polyvinylidene fluoride blend casting. Membrane solution: Vacuum defoam the graphene / polyvinylidene fluoride blend casting solution (degassing pressure is 50kPa), and cool to room temperature (about 25°C).

[0119] S2, the graphene / polyvinylidene fluoride blend casting film modified by the caged crown ether prepared in step S1 adopts the slit coating method (using a me...

Embodiment 2

[0129] This embodiment is a method for preparing a carbon dioxide separation membrane, comprising the following steps:

[0130] S1. Under high-speed shear (10000rpm), disperse 150.0g of caged crown ether-modified graphene (D50 is 10nm) in 842.5g of N,N-dimethylformamide (DMF), and stir for 2h to obtain a cage Crown ether modified graphene dispersion;

[0131] Then, 7.5 g of polym-phenylene isophthalamide (Yantai Taihe New Materials Co., Ltd.) was added to the cage-shaped crown ether-modified graphene dispersion, stirred and heated to 80°C for 4 hours to obtain a cage-like Crown ether modified graphene / polym-phenylene isophthalamide blend casting solution. Vacuum defoam the casting solution (degassing pressure is 60kPa), and cool to room temperature (about 25°C).

[0132] S2, the graphene / poly-m-phenylene isophthalamide blended film casting liquid that the cage crown ether modification prepared in step S1 is evenly coated on the porous aramid fiber cloth (DuPont TYVEK, Pore ...

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Abstract

The invention discloses a carbon dioxide separation membrane and its application. The carbon dioxide separation membrane comprises a support layer, a nanoparticle composite layer and a polymer layer arranged in sequence; the carbon dioxide permeability of the carbon dioxide separation membrane is greater than 3400 Barrer, CO 2 / N 2 The selection factor is greater than 45. The carbon dioxide separation membrane prepared by the present invention has a three-layer structure, and the nanoparticle composite layer is formed by combining nanoparticles and the first polymer to solve the defect problem caused by uneven dispersion or agglomeration of nanoparticles in the mixed matrix membrane in the related art; At the same time, it also solves the problem of selectivity loss caused by the mismatch between the polymer component and the inorganic nanoparticle phase interface in the traditional mixed matrix membrane. The carbon dioxide separation membrane of the present invention has high selectivity to carbon dioxide and high permeability.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a carbon dioxide separation membrane and its application. Background technique [0002] Global warming caused by the greenhouse effect has become the focus of global attention. In recent years, carbon emissions from energy consumption are still at a relatively high level and maintain a rapid growth trend, and efforts to reduce carbon emissions still need to be strengthened. To reduce CO 2 emissions, slow down the trend of global warming, and develop economical, efficient and large-scale coal-fired power plants CO 2 Emission reduction and enrichment separation technologies are urgently needed. [0003] CO 2 The most potential way to reduce emissions is CCUS (Carbon Capture, Utilization and Storage) technology. It is generally believed that chemical absorption is one of the most efficient methods in the carbon capture process, and finding a suitable absorbent is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/62B01D71/34B01D71/06B01D71/02B01D69/12B01D53/22B01D67/00
CPCB01D53/228B01D71/021B01D71/06B01D71/34B01D71/62B01D69/12B01D67/0079Y02C20/40
Inventor 谭叶梅
Owner 湖南叶之能科技有限公司
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