Method for preparing small crystal grain molecular sieve

Abstract

The invention relates to a method for preparing a small crystal grain molecular sieve, and mainly solves the problems that: by the conventional method for preparing the small crystal grain molecular sieve, the hydrothermal synthesis is required, the period is longer, the small crystal grain molecular sieve cannot be continuously produced, the separation is difficult after synthesis and the synthetic cost is high. The problems are better solved by adopting the technical scheme that the method for preparing the small crystal grain molecular sieve comprises the following steps of: feeding synthesized large crystal grain molecular sieve raw materials into crushing equipment and performing physical crushing, and classifying products to obtain the small crystal grain molecular sieve; and the method can be used for the production of small crystal grain molecular sieves.

Description

Technical field [0001] The invention relates to a preparation method of small crystal particle molecular sieve. Background technique [0002] Molecular sieves have good shape-selective catalytic performance and adsorption performance due to their uniform and regular pore structure, larger specific surface area and higher thermal stability, and are widely used in petrochemical and other fields. However, with the development of fine chemicals, large-grained zeolite materials have narrow pores and large diffusion resistance, and cannot achieve the expected catalytic effect in reactions involving large molecules or liquid phases. The small-crystalline zeolite molecular sieve has a larger external specific surface area and a higher intracrystalline diffusion rate, which can provide more active sites, the reactant molecules can easily reach the catalytic active sites, and the products generated can quickly pass from the pores. Diffusion out has superior performance in improving the ut...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that hydrothermal synthesis is required in the preparation process of small-grain molecular sieves, the prepared products are difficult to separate, the preparation cycle is long, the use of templates in the preparation pollutes the environment, and the preparation cost is high. A new method is provided. The method for preparing small-grain molecular sieves, using this method to prepare small-grain molecular sieves, non-hydrothermal synthesis, without using templates, has the advantages of easy separation, fast preparation speed, environmental protection, and low cost, and the prepared small-grain molecular sieves High activity

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