A carbon dioxide separation membrane and its application

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...

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.

Images