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Method for preparing size-controllable NaY molecular sieve

A technology for controlling size and molecular sieve, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high production cost, complex process, pipeline blockage, etc., and achieve the effect of low cost and simple process

Inactive Publication Date: 2016-04-27
HEZE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Whether it is in the directing agent or the method of adding other substances in the synthesis system, the common problems are that the process is complicated, the production cost is high, and it will cause secondary pollution, which is difficult to implement in industrial production.
Whether it is the segmented crystallization method or the rotational crystallization method, it is difficult to operate in the industrial production process
Chinese Patent Publication No. CN10033593C is to add sodium silicate solution to the conventional guiding agent with light transmittance75%, and the crystal grain size of synthetic NaY molecular sieve is 100 -300nm, but this method is easy to cause pipeline blockage

Method used

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  • Method for preparing size-controllable NaY molecular sieve
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  • Method for preparing size-controllable NaY molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Directing agent preparation

[0023] 854mL peralkaline sodium metaaluminate solution (Na 2 O content 278g / L, Al 2 o 3 Content 40.3g / L, specific gravity 1.326, product of Sinopec Catalyst Changling Branch) added to 1200mL water glass (SiO 2 Content 253.5g / L, modulus 3.25, specific gravity 1.256, product of Sinopec Catalyst Changling Branch), after mixing evenly, aging at room temperature for 24h to obtain the molar ratio Na 2 O: SiO 2 :Al 2 o 3 :H 2 O=16:15:1:320 directing agent.

[0024] gelation process

[0025] In the gelling kettle, according to the synthetic molar ratio Na 2 O: SiO 2 :Al 2 o 3 :H 2 O=2.70:8.4:1:209 (directing agent accounts for 5% of the aluminum source in the feed), first add water glass solution, heat up to 85-90°C, add directing agent under strong stirring conditions, stir for 5 minutes, and then Add sulfuric acid deionized water, aluminum sulfate and low-alkali sodium metaaluminate solution to the medium, keep the temperature at 85...

Embodiment 2

[0029] Directing agent preparation

[0030] 854mL peralkaline sodium metaaluminate solution (Na 2 O content 278g / L, Al 2 o 3 Content 40.3g / L, specific gravity 1.326, product of Sinopec Catalyst Changling Branch) added to 1200mL water glass (SiO 2 Content 253.5g / L, modulus 3.25, specific gravity 1.256, product of Sinopec Catalyst Changling Branch), after mixing evenly, aging at room temperature for 24h to obtain the molar ratio Na 2 O: SiO 2 :Al 2 o 3 :H 2 O=16:15:1:320 directing agent.

[0031] gelation process

[0032] In the gelling kettle, according to the synthetic molar ratio Na 2 O: SiO 2 :Al 2 o 3 :H 2 O=2.70:8.4:1:209 (directing agent accounts for 5% of the aluminum source in the feed), first add water glass solution, heat up to 25-30°C, add directing agent under strong stirring conditions, stir for 20 minutes, and then Add sulfuric acid deionized water, aluminum sulfate and low-alkali sodium metaaluminate solution to the medium, keep the temperature at 2...

Embodiment 3

[0036] Directing agent preparation

[0037] 854mL peralkaline sodium metaaluminate solution (Na 2 O content 278g / L, Al 2 o 3 Content 40.3g / L, specific gravity 1.326, product of Sinopec Catalyst Changling Branch) added to 1200mL water glass (SiO 2 Content 253.5g / L, modulus 3.25, specific gravity 1.256, product of Sinopec Catalyst Changling Branch), after mixing evenly, aging at room temperature for 24h to obtain the molar ratio Na 2 O: SiO 2 :Al 2 o 3 :H 2 O=16:15:1:320 directing agent.

[0038] gelation process

[0039] In the gelling kettle, according to the synthetic molar ratio Na 2 O: SiO 2 :Al 2 o 3 :H 2 O=2.70:8.4:1:209 (directing agent accounts for 5% of the aluminum source in the feed), first add water glass solution, heat up to 55-60°C, add directing agent under strong stirring conditions, stir for 30 minutes, and then Add sulfuric acid deionized water, aluminum sulfate and low-alkali sodium metaaluminate solution to the medium, keep the temperature at 5...

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Abstract

The invention discloses a method for preparing a size-controllable NaY molecular sieve, belonging to the technical field of inorganic synthesis. The method is characterized in that in the preparation process of synthesizing the NaY molecular sieve according to a conventional gel method, a high-crystallinity NaY molecular sieve with a crystal size of 200 to 1000 nm can be synthesized without changing other conditions but only through controlling a temperature in the gel forming process. The method disclosed by the invention has the advantages of low cost, simple technology and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis, and in particular relates to a preparation method of a size-controllable NaY molecular sieve. Background technique [0002] Y-type molecular sieve is widely used in petrochemical industry due to its unique thermal stability and hydrothermal stability, and low production cost. For example, it is the core active component of fluid catalytic cracking catalyst, hydrocracking catalyst An active component of an adsorbent catalyst as an active component and carrier. [0003] With the heavy and inferior degree of catalytic raw materials, the requirements for catalysts are becoming more and more stringent. Due to the small pores of the Y-type molecular sieve, it is difficult for heavy oil macromolecules to enter the pores. At the same time, it also limits the rapid diffusion of molecules inside the molecular sieve, increases the proportion of secondary cracking, and will increase the amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J29/08
CPCB01J29/084C01B39/24C01P2004/03
Inventor 于心玉于文倩
Owner HEZE UNIV
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