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

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

Active Publication Date: 2021-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • 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

[0082] 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. performance, with higher and aromatic-rich gasoline yields.

[0083] 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 The metho...

Embodiment approach

[0094] 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.

[0095] In the preparation method according to the present disclosure, the phosphorus-modified molecular sieve can be exchanged and / or impregnated by contacting the solution containing the active element to load the active element on the modified Y-type molecular sieve. And / or the effect of dipping treatment, the solution containing active elements is preferably an aqueous solution of gallium salt or boron compound or an aqueous solution containing gallium salt and boron compound, or a ...

specific Embodiment approach

[0116] In a third specific embodiment of the present disclosure, the method for preparing a modified Y-type molecular sieve comprises the following steps:

[0117] (1) Perform ion exchange reaction between NaY molecular sieve (also known as NaY zeolite) and rare earth solution, filter and wash to obtain ion exchanged molecular sieve, which has reduced sodium oxide content, contains rare earth elements and has conventional crystal cell size; the ion exchange is usually exchanged for 30 to 120 minutes under conditions of stirring and a temperature of 15 to 95° C., preferably 65 to 95° C.;

[0118] (2) Calcining the ion-exchanged molecular sieve at a temperature of 350 to 480°C in an atmosphere containing 30 to 90% by volume of water vapor for 4.5 to 7 hours, and drying to obtain a mild hydrothermal superstable product with a water content of less than 1% by weight. Modified molecular sieve; the unit cell constant of the mildly hydrothermally ultrastable modified molecular sieve ...

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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 active element oxide is 0.1-5% by weight, and the active element is gallium and / or boron; the modified Y The total pore volume of the Y-type molecular sieve is 0.36-0.48mL / g, and the ratio of the pore volume of the secondary pores with a pore diameter of 2-100nm to the total pore volume is 20-40%; 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-skeleton aluminum content of the modified Y-type molecular sieve accounts for no more than 10% of the total aluminum content, and the strong acid content of the modified Y-type molecular sieve The ratio of B acid amount to 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, and higher aromatics-rich gasoline yield.

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): B01J29/08B01J35/10C10G11/05
CPCB01J29/088B01J35/1023B01J35/1038C10G11/05C10G2300/70
Inventor 周灵萍沙昊许明德陈振宇袁帅张蔚琳姜秋桥田辉平
Owner CHINA PETROLEUM & CHEM CORP
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