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Modified Y-type molecular sieve and its preparation method and application

A molecular sieve and modification technology, used in molecular sieve catalysts, chemical instruments and methods, and refined hydrocarbon oil, etc., can solve the problems of poor accessibility of active centers, small unit cell constants, high silicon-aluminum ratio, and achieve low coke selectivity, high The effect of low non-framework aluminum content and high crystallinity

Active Publication Date: 2021-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Modified Y-type molecular sieve and its preparation method and application
  • Modified Y-type molecular sieve and its preparation method and application
  • Modified Y-type molecular sieve and its preparation method and application

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preparation example Construction

[0077] The preparation method of the present disclosure can prepare a high-silicon Y-type molecular sieve rich in secondary pores with high crystallinity, high thermal stability and high hydrothermal stability, and can make the molecular sieve have higher Crystallinity, the aluminum distribution in the prepared molecular sieve is uniform, the non-skeleton aluminum content is less, and the secondary pores are smooth. The modified Y-type molecular sieve is used for processing hydrogenation LCO and has high LCO conversion efficiency and low coke selection. Higher gasoline yield rich in BTX aromatics and high propylene yield.

[0078]In the preparation method of the modified Y-type molecular sieve provided by the present disclosure, in step (1), the NaY molecular sieve and the rare earth solution are subjected to an ion exchange reaction to obtain a Y-type molecular sieve with a conventional unit cell size containing rare earths with reduced sodium oxide content, and ion exchange ...

Embodiment approach

[0090] In one embodiment, the phosphorus modification treatment conditions are as follows: adding the acid-treated molecular sieve sample into the exchange solution containing phosphorus compounds, performing exchange reaction at 15-100°C for 10-100 minutes, filtering and washing Wherein, the weight ratio of the water in the exchange liquid and the molecular sieve is (2~5): 1, preferably (3~4): 1, phosphorus (in P 2 o 5 weight) to molecular sieve is (0.0005-0.10):1, preferably (0.001-0.06):1.

[0091]In the preparation method according to the present disclosure, the phosphorus-modified molecular sieve can be contacted with gallium and zirconium elements in a solution, and then exchanged and / or impregnated to load the active elements gallium and zirconium on the modified Y-type molecular sieve In the above, the contact with the active elements gallium and zirconium in the solution can be contacted once or multiple times to introduce the required amount of active elements; in o...

Embodiment 1

[0109] 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), after stirring for 60min, filter, wash, and the filter cake is continuously sent to the flash drying oven for drying; obtain the Y-type molecular sieve with the conventional unit cell size containing rare earths that the sodium oxide content reduces, and its sodium oxide content is 7.0% by weight, the unit cell constant is 2.471nm, and the rare earth content is 8.8% by weight in terms of oxides. Then, it is sent into a roasting furnace for modification: control the material atmosphere temperature at 390 ° C, 50% water vapor (containing 50% by volume in the atmosphere water vapor) for 6 hours; the...

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Abstract

The disclosure relates to a modified Y-type molecular sieve and a preparation method thereof. The content of rare earth elements in the modified Y-type molecular sieve is 4 to 11% by weight in terms of oxides, and the content of P 2 o 5 The content of phosphorus is 0.05-10% by weight, the content of sodium oxide is not more than 0.5% by weight, the content of gallium oxide is 0.1-2.5% by weight, and the content of zirconia is 0.1-2.5% by weight; the total amount of the modified Y-type molecular sieve The pore volume is 0.36-0.48mL / g, and the pore volume of secondary pores with a pore diameter of 2-100nm accounts for 20-40% of the total pore volume; the unit cell constant of the modified Y-type molecular sieve is 2.440-2.455nm , the lattice collapse temperature is not lower than 1060°C; the non-skeletal aluminum content of the modified Y-type molecular sieve accounts for no more than 10% of the total aluminum content, and the amount of B acid in the strong acid amount of the modified Y-type molecular sieve is equal to The ratio of L acid amount is not less than 3.5. The modified Y-type molecular sieve of the present disclosure is used for processing hydrogenated LCO while having high LCO conversion efficiency, low coke selectivity, higher gasoline yield and high propylene yield rich in BTX aromatics, The concentration of propylene in liquefied gas is high.

Description

technical field [0001] The disclosure relates to a modified Y-type molecular sieve and its preparation method and application. Background technique [0002] Light aromatics such as benzene, toluene and xylene (BTX) are important basic organic chemical raw materials, widely used in the production of polyester, chemical fiber, etc., and demand has been strong in recent years. Light aromatics such as benzene, toluene and xylene (BTX) mainly come from catalytic reforming and steam cracking processes using naphtha as raw material. Due to the shortage of naphtha raw materials, there is a large market gap for light aromatics. [0003] Catalytic cracking light cycle oil (LCO) is an important by-product of catalytic cracking, which is rich in aromatic hydrocarbons, especially polycyclic aromatic hydrocarbons, and belongs to the low-quality diesel fraction. With the development and change of market demand and environmental protection requirements, LCO is greatly restricted as a dies...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08C01B39/24C10G45/64
CPCB01J29/088C01B39/24C10G45/64C10G2400/04
Inventor 周灵萍沙昊陈振宇许明德袁帅张蔚琳姜秋桥田辉平
Owner CHINA PETROLEUM & CHEM CORP
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