Method for preparing nano NaY molecular sieve

A molecular sieve and nanotechnology, which is applied in the field of preparation of nano-NaY molecular sieves, can solve the problems of large particle size, uneven particle size distribution, long crystallization time, etc., and achieve narrow particle size distribution, improved product distribution, and light oil yield. Improved effect

Inactive Publication Date: 2009-10-21
BEIJING UNIV OF CHEM TECH
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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)

Method used

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  • Method for preparing nano NaY molecular sieve
  • Method for preparing nano NaY molecular sieve
  • Method for preparing nano NaY molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the high-gravity rotating bed with a rotating speed of 600r / min, the directing agent with a silicon-aluminum ratio of 7:1 (mixing 0.88mol / L sodium silicate 725ml with 0.91mol / L sodium aluminate 100ml) was prepared respectively, and the silicon-aluminum ratio was 4:1 (mixing 0.75mol / L sodium silicate 4250ml with 1.21mol / L sodium aluminate 1300ml) mother liquor, and mixing the two in a rotating bed to form a reaction solution, and aging at room temperature for 24h, and then in crystal Crystallization at a temperature of 100°C for 12 hours in a chemical reactor; washing to make the pH value reach 7-9, drying; roasting at 600°C for 3 hours to form NaY molecular sieves. The specific surface area is 701m 2 / g.

[0050] The present invention is using image 3 During the preparation of NaY molecular sieves in the high-gravity rotating bed reactor shown, the main process is as follows Figure 4 shown. After the high-gravity rotating bed reactor is turned on, the screen pa...

Embodiment 2

[0053] The rotational speed of the high-gravity rotating bed reactor is 1200r / min, and the rest of the conditions are the same as in Example 1. The specific surface area of ​​the obtained NaY molecular sieve is 743m 2 / g, the SEM photo of the product is as Figure 7 shown.

Embodiment 3

[0055] The rotational speed of the high-gravity rotating bed reactor is 1800r / min, and the rest of the conditions are the same as in Example 1. The obtained NaY molecular sieve has a specific surface area of ​​735m 2 / g, the SEM photo of the product is as Figure 8 shown.

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Abstract

The invention relates to a preparation method of nanometer NaY molecular sieve. Through the preparation of the directing agent, the preparation of the mother liquor, the mixing of the directing agent and the mother liquor, and the subsequent crystallization of the reaction product under the condition of high gravity in the rotating bed, it provides a preparation that shortens the crystallization reaction time and simplifies the process flow. A method for high-quality nanometer NaY molecular sieves. The nanometer NaY molecular sieve catalyst prepared by the method of the invention is applied to catalytic cracking of heavy oil, and has distinct advantages compared with conventional industrial molecular sieves. Gasoline yield, diesel yield, light oil yield and total liquid yield can all be greatly increased, not only improving product selectivity, but also significantly improving 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24C01B39/52
Inventor 陈建峰许永权蔡连国邵磊
Owner BEIJING UNIV OF CHEM TECH
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