Method for sintering of porous ceramic support and in-situ hydrothermal synthesis of molecular sieve membrane by molecular sieve

Abstract

The invention discloses a method for sintering of a porous ceramic support and in-situ hydrothermal synthesis of a molecular sieve membrane by a molecular sieve. The method comprises adding an appropriate amount of molecular sieve powder into conventional porous ceramic support ingredients, carrying out molding, carrying out drying, carrying out sintering at a high temperature to obtain a porous ceramic support containing a molecular sieve conversion product, putting the ceramic support into a synthesis solution for preparing a molecular sieve film and carrying out in-situ hydrothermal synthesis to obtain a molecular sieve membrane. Compared with the molecular sieve membrane without the molecular sieve conversion product on the ceramic support, the molecular sieve membrane containing the molecular sieve conversion product is compacter and has better separation performances. The method is easy to operate, reduces a sintering temperature and is free of crystal coating and support post-treatment. The synthetic molecular sieve membrane is continuous and compact, has good separation performances and good repeatability, saves energy, is environmentally friendly and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a porous ceramic support body by adding molecular sieve sintering and in-situ hydrothermal synthesis of a molecular sieve membrane, in particular to a method for preparing a porous ceramic support body by adding molecular sieve powder to a conventional porous ceramic support body batching, through seedless coating A method for preparing molecular sieve membranes by in situ hydrothermal synthesis. 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 regular pores and a single pore size distribution; and the pore size of molecular sieves is similar to the molecular size of many important industrial raw materials, and molecules can be separated by molecular sieving or shape-se...

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Problems solved by technology

[0005] The purpose of the present invention is to avoid the disadvantages of high price and inefficiency in the synthesis of nano-crystal seeds, and to overcome the instability and non-repeatability of the existing crystal-coating technology, and to provide a preparation process that does not change the original porous ceramic support. Simple doping of molecular sieves in ingredients and efficient in situ hydrothermal synthesis for the preparation of dense molecular sieve membranes on the surface of porous ceramic supports

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