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Modified Y-type molecular sieve and preparation method thereof

A molecular sieve and modification technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, and hydrocarbon oil treatment, can solve the problems of high silicon-aluminum ratio, small unit cell constant, and poor accessibility of active centers, etc., and achieve high crystallinity, The effect of high conversion efficiency and low coke selectivity

Active Publication Date: 2020-02-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ultra-stable molecular sieve prepared by this method has a high silicon-alumina ratio, a small unit cell constant, and contains a certain amount of rare earth, but it does not involve the preparation of a molecular sieve with secondary pores. The high-stable molecular sieve has poor accessibility to the active center , the activity is not high
[0014] In summary, it is difficult for the ultra-stable Y-type molecular sieve prepared by the existing technology to simultaneously have high heavy oil catalytic cracking activity and good coke selectivity

Method used

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  • Modified Y-type molecular sieve and preparation method thereof
  • Modified Y-type molecular sieve and preparation method thereof
  • Modified Y-type molecular sieve and preparation method thereof

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preparation example Construction

[0058] One embodiment of the present invention further provides a method for preparing the above-mentioned modified Y-type molecular sieve, comprising the following steps:

[0059] (1) carry out ion exchange reaction with NaY molecular sieve and rare earth salt solution, to obtain the Y-type molecular sieve that the unit cell size containing rare earth that sodium oxide content reduces does not change;

[0060] (2) Roasting the Y-type molecular sieve whose unit cell size containing the rare earth after ion exchange does not change, to obtain the Y-type molecular sieve whose unit cell constant is reduced;

[0061] (3) contacting and reacting the Y-type molecular sieve with reduced unit cell constant after roasting with silicon tetrachloride gas to carry out dealumination and silicon supplementation to obtain gas-phase superstable modified Y-type molecular sieve;

[0062] (4) acid-treating the gas-phase ultrastable modified Y-type molecular sieve reacted with silicon tetrachlori...

Embodiment 1

[0124] 2000Kg (dry basis weight) skeleton SiO 2 / Al 2 o 3 Be 4.6 NaY type zeolite (sodium oxide content 13.5% by weight, Sinopec Catalyst Qilu Branch Company produces) joins and is equipped with 20m 3 In the water exchange tank, stir well at 25°C and then add 600L RECl 3 Solution (RECl 3 The rare earth concentration in the solution is expressed as RE 2 o 3 Calculated as 319g / L, RE is a mixed rare earth of La and Ce, and La is calculated by the mass of rare earth oxide 2 o 3 : Ce 2 o 3 =3:2), continue to stir after 60 minutes, filter, wash, and filter cake is sent into flash drying oven and is dried; Obtain the Y-type molecular sieve of the conventional unit cell size containing rare earth that sodium oxide content reduces, and its sodium oxide content is 7.0wt%, unit cell constant is 2.471nm.

[0125] Afterwards, the Y-type molecular sieve with the conventional unit cell size containing rare earths with reduced sodium oxide content was sent to a roasting furnace for ...

Embodiment 2

[0133] 2000Kg (dry basis weight) skeleton SiO 2 / Al 2 o 3 Be 4.6 NaY type zeolite (sodium oxide content 13.5% by weight, Sinopec Catalyst Qilu Branch Company produces) joins and is equipped with 20m 3 In the primary exchange tank of decationized water, stir evenly at 90°C, and then add 800L RECl 3 Solution (RECl 3 The rare earth concentration in the solution is expressed as RE 2 o 3 Calculated as 319g / L, RE is a mixed rare earth of La and Ce, and La is calculated by the mass of rare earth oxide 2 o 3 : Ce 2 o 3 =3:2), stirred for 60 minutes; filtered, washed, and the filter cake was sent to a flash drying oven for drying to obtain a Y-type molecular sieve with a rare earth-containing conventional unit cell size with reduced sodium oxide content, and its sodium oxide content was 5.5wt %, the unit cell constant is 2.471nm.

[0134] Afterwards, the Y-type molecular sieve with the rare earth-containing conventional unit cell size with reduced sodium oxide content is sent...

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Abstract

One embodiment of the invention provides a modified Y-type molecular sieve and a preparation method thereof, wherein the modified Y-type molecular sieve comprises 5-12 wt% of rare earth (calculated asrare earth oxide), not more than 0.5 wt% of sodium (calculated as sodium oxide), and 0.5-5 wt% of zinc (calculated as zinc oxide), the skeleton silicon-alumina ratio is 7-14 based on SiO2 / Al2O3 molarratio, the mass of the non-skeleton aluminum accounts for not more than 10% of the total aluminum mass, and the pore volume of secondary pores with a pore size of 2-100 nm accounts for 20-38% of thetotal pore volume. According to the invention, the modified Y-type molecular sieve has advantages of high crystallinity, high thermal stability, high hydrothermal stability and rich secondary pores, is used for catalytic cracking of hydrogenated LCO (light cycle oil), and has advantages of low coke selectivity and high conversion efficiency of reactants.

Description

technical field [0001] The invention relates to a Y-type molecular sieve, in particular to a modified Y-type molecular sieve which can be used for processing hydrogenated LCO catalytic cracking and a preparation method thereof. Background technique [0002] Y-type molecular sieves (also known as Y-type zeolites) have been the main active component of catalytic cracking (FCC) catalysts since they were first used in the 1960s. However, with the intensification of heavy crude oil, the content of polycyclic compounds in FCC raw materials increased significantly, but their diffusion capacity in zeolite channels decreased significantly. The pore size of Y-type molecular sieve as the main active component is only 0.74nm, and it is directly used to process heavy fractions such as residual oil. The accessibility of the active center of the catalyst will become the main obstacle to the cracking of polycyclic compounds contained therein. [0003] Molecular sieve pore structure is clos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J35/10C01B39/24C10G11/05
CPCB01J29/088C01B39/24C10G11/05C10G2300/70B01J35/60B01J35/647B01J35/651
Inventor 沙昊周灵萍袁帅姜秋桥许明德张蔚琳陈振宇田辉平
Owner CHINA PETROLEUM & CHEM CORP
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