Method for synthesizing NaA-type molecular sieve membrane on inner wall of support body

Abstract

The invention discloses a method for synthesizing a NaA-type molecular sieve membrane on an inner wall of a support body. The method adopts a way of adding an adhesive to coat seed crystal to synthesize the molecular sieve membrane. Clear liquid, composition of which is similar to that of synthetic liquid for synthesizing the molecular sieve membrane, is prepared to serve as the adhesive, and then the clear liquid is mixed with molecular sieve crystal suspension in certain proportion to prepare seed crystal liquid; the support body is immersed into the seed crystal liquid; the support body is dried after being dipped so as to obtain the support body with the seed crystal; and finally, the molecular sieve membrane is synthesized by a dynamic hydrothermal synthesis method. According to the invention, prepared seed crystal layers are distributed uniformly, the surface of the synthesized molecular sieve membrane is continuous and dense, and the synthesized molecular sieve membrane has an excellent separating property, is good in repeatability and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the synthesis of molecular sieve membranes, in particular to a method for synthesizing NaA type molecular sieve membranes on the inner wall of a support. Background technique [0002] Molecular sieve is a microporous inorganic crystal material formed with silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron as the basic skeleton. Molecular sieves have the following advantages as inorganic membrane materials: 1) Molecular sieves have standardized and neat pores with a single pore size distribution; and the pore size of molecular sieves is similar to that of many important industrial raw materials. Molecules can be obtained by molecular sieving or shape-selective diffusion. separate. 2) Molecular sieves have good chemical stability and thermal stability. 3) The diversity of molecular sieve structures leads to the diversity of its properties, such as different pore sizes and different hydrophilic and hydrophobic properties...

AI Technical Summary

Problems solved by technology

However, the most challenging issue in synthesizing molecular sieve membranes on the inner wall of the small-diameter support is how to introduce the molecular sieve crystal seeds into the inner surface of the support, because the inner cavity of the small-diameter support is too small, which will lead to difficulties in the operation of the crystal coating method reported above. unavailable

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