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Method for preparing mesopore-containing high-crystallinity Y-type molecular sieve by template method

A high crystallinity, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problems such as limited improvement of acidity and hydrothermal stability, failure to meet the requirements of FCC use, etc. Achieve the effect of obvious mesoporous characteristics, simple preparation method and high feasibility

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

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Problems solved by technology

[0003] Disclosed in CN1349929A ​​is a molecular sieve with medium pore and high crystallinity, 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 water The improvement of thermal stability is still very limited and cannot meet the requirements of FCC

Method used

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  • Method for preparing mesopore-containing high-crystallinity Y-type molecular sieve by template method
  • Method for preparing mesopore-containing high-crystallinity Y-type molecular sieve by template method
  • Method for preparing mesopore-containing high-crystallinity Y-type molecular sieve by template method

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preparation example Construction

[0017] A method for template preparation containing medium-pore high crystallinity Y-type molecular sieve, characterized in that the preparation method comprises:

[0018] (1) A cationic starch template modified by 2,3-epoxypropyltrimethylammonium chloride with a degree of substitution of 0.01% to 10%, a crystallization directing agent, an alkali source and water according to the cationic starch template, The mass ratio of alkali source and water is (0.1~5):(0.1~3):(1~100) mixed, and then hydrolyzed at 30~150°C to obtain a hydrolyzate;

[0019] (2) 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 the silicon source, aluminum source and water, then add the hydrolyzate of (1), and age at 0-80°C for 0.5-60h to obtain the crystallization directing agent, and the added amount of the hydrolyzate is silicon 0.01 to 0.8 of the source, wherein the hydrolyzate is calculated as cationic starch template, and the silicon source is calculat...

Embodiment 1

[0035] 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.

[0036] According to Al 2 o 3 :15SiO2 2 :16.5Na 2 O:320H 2 O molar ratio, add 30ml of water glass (modulus 3.3) into 20.8ml of sodium metaaluminate solution, stir to dissolve, then add YZA-2 cationic starch aqueous solution after the above hydrolysis treatment, stir for 1h, and finally in the aging The temperature is 45° C., and the aging time is 5 hours to obtain the crystallization directing agent.

[0037] Then add the above 18g of guiding agent to 65ml of water glass (modulus 3.3), stir for 0.5h, then add 40ml of aluminum sulfate and 18ml of sodium metaaluminate, continue stirring for 1h after adding, and finally put the mixture into a stainless steel crystallization kettle After being airtight, put it in an oven at 95°C for 28 hours to ...

Embodiment 2

[0055] Take 1g of YZA-1 cationic starch (substitution degree 1%) and put it in 60g of water, then add 0.5g of NaOH, stir evenly, heat up to 40°C, stir at constant temperature for 1h for hydrolysis treatment.

[0056] According to Al 2 o 3 :15SiO2 2 :16.5Na 2 O:320H 2 O molar ratio, add 30ml water glass (modulus 3.3) into 20.8ml sodium metaaluminate solution, stir to dissolve, then add YZA-1 cationic starch (substitution degree 1%) aqueous solution after the above hydrolysis treatment, stir 1h, and finally at an aging temperature of 30°C and an aging time of 20h to obtain a crystallization directing agent.

[0057] Then add the above 12g of directing agent to 50ml of water glass (modulus 3.3), stir for 0.5h, then add 30ml of aluminum sulfate and 10ml of sodium metaaluminate, continue stirring for 1h after adding, and finally put the mixture into a stainless steel crystallization kettle After being airtight, place it in an oven at 90°C for 30 hours to crystallize, filter, w...

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Abstract

The invention relates to a method for preparing a mesopore-containing high-crystallinity Y-type molecular sieve by using a template agent. The preparation method is characterized by comprising the following steps: (1) mixing a cationic starch template agent modified by 2,3-epoxypropyl trimethyl ammonium chloride with a substitution degree of 0.01-10%, an alkali source and water, and carrying out hydrolysis to obtain a hydrolysate; (2) mixing a silicon source, an aluminum source and water, then adding the hydrolysate obtained in the step (1), and aging to obtain a crystallization directing agent; and (3) mixing a silicon source, an aluminum source and water to obtain reactive silica-alumina gel, adding the crystallization directing agent obtained in the step (2), fully and uniformly mixingto obtain a gel mixture, crystallizing the gel mixture in a closed crystallization kettle, and recovering the product.

Description

technical field [0001] The invention relates to a method for preparing a Y-type molecular sieve containing mesopores and high crystallinity by a template method. 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 mesopores and high crystallinity 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.) It is considered to...

Claims

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Application Information

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