Composite membrane as well as preparation method and the application thereof in gas separation and purification

Abstract

The invention provides a composite membrane. A porous carrier is adopted as a support body, an organic-inorganic porous material is adopted as a transition layer on the surface of the support body, and a polymer membrane is arranged on the surface of the transition layer. When the composite membrane is applied to gas separation, purification, and the like, a gas penetrates through the polymer membrane and is subjected to secondary separation in the organic-inorganic porous transition layer, compared with the polymer membrane, the composite membrane is excellent in permeability and relatively good gas selectivity, compared with a conventional inorganic porous membrane, the composite membrane is capable of improving gas separation and purification performance. Therefore, the composite membrane has relatively good application prospects in industrial fields such as gas separation, purification, and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a composite membrane, its preparation method and its application in gas separation and purification. Background technique [0002] Membrane separation technology is an important separation technology to adapt to the development of modern industry. Compared with the traditional technology of adsorption and separation by changing the temperature, it has the advantages of energy saving and environmental friendliness. In order to meet the needs of industrial development, more and more research groups are committed to the development and production of gas separation membranes with excellent separation performance and high flux. [0003] Due to the advantages of low energy consumption, simple process, easy automation, strong flexibility, no pollution and convenient operation, polymer separation membranes are widely used in hydrogen recovery, oxygen-enriched, nitrogen-enrich...

AI Technical Summary

Problems solved by technology

However, many studies have shown that the gas selectivity and permeability of polymer membrane materials cannot be balanced, there is a Robeson upper limit, and it is difficult to have high gas permeability and high gas selectivity at the same time

In addition, the thickness of traditional polymer self-supporting membranes is relatively high, reaching tens of microns, and the air permeability coefficient is low. In order to increase the permeability in industrial applications, high pressure is often required, which not only increases the industrial cost, but also requires high equipment. , with a certain risk

[0004] Traditional inorganic porous membranes have a high gas permeability coefficient, but the gas separation performance is not high. In addition, defects are prone to occur in the preparation process of inorganic porous membranes, and it is difficult to produce large continuous and dense separation membranes.

Images