Method for preparing nano NaY molecular sieve

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

Inactive Publication Date: 2008-05-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 lab

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

Example Embodiment

[0048] Example 1:

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

[0050] The present invention is using image 3 When preparing NaY molecular sieve in the supergravity rotating bed reactor shown, the main process is as follows Figure 4 Shown. After the high-gravity rotating bed reactor is turned on, the wire mesh packing 5 is...

Example Embodiment

[0052] Example 2:

[0053] The rotating speed of the supergravity rotating bed reactor is 1200r / min, and other 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 such as Figure 7 Shown.

Example Embodiment

[0054] Example 3:

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

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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...

Claims

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Application Information

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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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