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Preparation method of mesopore-containing high-crystallinity Y-type molecular sieve

A technology of molecular sieve and crystallization directing agent, applied in molecular sieve and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problem of limited improvement in acidity and hydrothermal stability, and can not reach FCC use requirements, etc., to achieve the effect of obvious mesoporous characteristics, simple preparation method and broad application prospects

Active Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Disclosed in CN1349929A ​​is a kind of molecular sieve with high crystallinity containing mesopore, which is characterized in that the primary and secondary structural units of Y-type zeolite are introduced in the molecular sieve pore wall, so that it has the basic structure of traditional Y-type molecular sieve, but its acidity and The improvement of hydrothermal stability is still very limited and cannot meet the requirements of FCC use

Method used

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  • Preparation method of mesopore-containing high-crystallinity Y-type molecular sieve
  • Preparation method of mesopore-containing high-crystallinity Y-type molecular sieve
  • Preparation method of mesopore-containing high-crystallinity Y-type molecular sieve

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preparation example Construction

[0018] The preparation method of the high-crystallinity Y-type molecular sieve containing mesopore provided by the present invention is characterized in that it is characterized in that the preparation method comprises:

[0019] Preparation of crystallization directing agent: according to Al 2 o 3 :(1~35)SiO2 2 :(10~35)Na 2 O:(180~400)H 2 The molar ratio of O is to mix silicon source, aluminum source and water, and then carry out static aging at 0-80°C to obtain a crystallization directing agent;

[0020] The cationic starch template modified by 2,3-epoxypropyltrimethylammonium chloride with a degree of substitution of 0.01% to 10%, alkali source and water according to the mass ratio of cationic starch template, alkali source and water is (0.1~5):(0.1~3):(1~100) mixed, then hydrolyzed at 30~150℃ to obtain hydrolyzate;

[0021] According to Al 2 o 3 :(1~20)SiO2 2 :(1~10)Na 2 O:(120~300)H 2 Molar ratio of O, the crystallization directing agent, silicon source, aluminum...

Embodiment 1

[0037] According to Al 2 o 3 :15SiO2 2 :16.5Na 2 O:320H 2 O molar ratio, 30ml of water glass (modulus 3.3) was added to 20.8ml of sodium metaaluminate solution, stirred to dissolve, and then aged at 45°C for 5h to obtain a crystallization director.

[0038] Take 2g of YZA-2 cationic starch (2,3-epoxypropyltrimethylammonium chloride substitution degree 0.5%) in 60g of water, add 1g of NaOH, stir evenly, heat up to 60°C, stir at constant temperature for 1h for hydrolysis treatment.

[0039] Then add the above 18g of directing agent to 65ml of water glass (modulus 3.3), stir for 0.5h, then add the YZA-2 cationic starch aqueous solution after the above hydrolysis treatment, stir for 1h, then add 40ml of aluminum sulfate and 18ml of sodium metaaluminate After the addition, continue to stir for 1h, and finally put the mixture into a stainless steel crystallization kettle, seal it and place it in a 95°C oven for 28h to crystallize, then filter, wash, and dry the filter cake in a ...

Embodiment 2

[0056] According to Al 2 o 3 :15SiO2 2 :16.5Na 2 O:320H 2 O molar ratio, 30ml of water glass (modulus 3.3) was added to 20.8ml of sodium metaaluminate solution, stirred to dissolve, and then aged at 30°C for 20 hours to obtain a crystallization directing agent.

[0057] Take 1g of YZA-1 cationic starch (2,3-epoxypropyltrimethylammonium chloride substitution degree 1%), put it in 60g of water, add 0.5g of NaOH, stir evenly, heat up to 40°C, stir at constant temperature for 1h to hydrolyze deal with.

[0058] Then add the above 12g of directing agent to 50ml of water glass (modulus 3.3), stir for 0.5h, then add the YZA-1 cationic starch aqueous solution after the above hydrolysis treatment, stir for 1h, then add 30ml of aluminum sulfate and 10ml of sodium metaaluminate After the addition, continue to stir for 1h, and finally put the mixture into a stainless steel crystallization kettle, seal it and put it in a 90°C oven for 30h to crystallize, then filter, wash, and dry the...

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Abstract

The invention discloses a preparation method of a Y-type molecular sieve. The preparation method is characterized by comprising the following steps: mixing a cationic starch template agent modified by2,3-epoxypropyl trimethyl ammonium chloride with a substitution degree of 0.01-10%, an alkali source and water according to a mass ratio of (0.1-5):(0.1-3):(1-100), carrying out hydrolysis at 30-150DEG C to obtain a hydrolysate; fully mixing a crystallization directing agent, a silicon source, an aluminum source and water to obtain reactive silica-alumina gel, adding the hydrolysate into the gelto obtain an initial mixture; fully and uniformly mixing the initial mixture to obtain a gel mixture, allowing the gel mixture to stand in a closed crystallization kettle at 60-180 DEG C for crystallization for 0.5-60 h, and recovering the product.

Description

technical field [0001] The invention relates to a preparation method of a Y-type molecular sieve containing medium pores and high crystallinity. Background technique [0002] Y-type molecular sieves for conventional industrial applications mainly include HY with a relatively high silicon-aluminum ratio, dealuminated ultra-stabilized USY, and REY or REUSY for rare earth exchange for catalytic cracking reactions. Fluid catalytic cracking (FCC) is an important process in the secondary processing of crude oil. With the heavy and poor quality of crude oil, the excellent properties of Y-type molecular sieves with mesopores and high crystallinity gradually emerged. The Y-type molecular sieve with high crystallinity containing mesopores has a micropore and mesopore dual-pore model pore distribution structure, combining mesoporous materials (excellent diffusion performance) and microporous zeolite molecular sieves (strong acidity, high stability, etc.) The advantages of the former ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
CPCC01B39/205C01P2002/72C01P2006/12C01P2006/14
Inventor 王成强郑金玉罗一斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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