Method for preparing nano NaY molecular sieve

Abstract

The invention relates to a preparation method of nanometer NaY molecular sieve, which is as follow: under the hypergravity condition of the revolving bed, performing guiding agent preparation, mother solution preparation, and mixing of guiding agent and mother solution, and the sequent crystallization of the reaction product. The invention enables to shorten the crystallization reaction time, simplify the technological process and prepare the high-quality nanometer NaY molecular sieves. The nanometer NaY molecular sieve catalyst prepared through the method can be used for the catalytic cracking of the heavy oil. Compared with the normal industrial molecular sieve, the nanometer NaY molecular sieve has the advantages of great increase of gasoline productivity, diesel fuel productivity, clean oil yield and total-liquid yield, improvement of the product selectivity, and obvious improvement of the product distribution.

Description

Technical field: [0001] The invention relates to a preparation method of nanometer NaY molecular sieve. Background technique: [0002] NaY molecular sieves are widely used in petroleum processing, food industry, light industry and other industrial sectors. Due to the small size effect and surface effect, nano-NaY molecular sieves have physical and chemical properties that ordinary NaY molecular sieves do not have. They have the advantages of high reactivity and special selectivity to products, so they have broad application prospects. For example: nano-NaY molecular sieves are used for the alkylation and hydrocracking of hydrocarbons, showing higher activity than ordinary NaY molecular sieves; nano-NaY molecular sieves are used for the separation of xylene isomers, O 2 and N 2 The separation can enhance the separation effect; the ion exchange ability of NaY molecular sieve can be used as ion exchange material, etc. [0003] There are many synthesis methods of NaY molecula...

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Problems solved by technology

The general crystallization time of the above-mentioned method is longer, and the molecular sieve of synthesizing nanoscale needs crystallization more than 20 hours, and the nano-NaY molecular sieve synthesized in the laboratory is in the industrialization, because enlargement effect causes particle diameter to become large, particle size distribution is uneven (see Zhao Wen Jiang et al., Liaoning Chemical Industry, 2003, 32(10): 440-442)

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