Catalytic cracking catalyst, preparation method and applications thereof

A catalytic cracking and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of small unit cell constant, poor accessibility of active centers, low activity, etc.

Active Publication Date: 2020-02-25
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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  • Catalytic cracking catalyst, preparation method and applications thereof
  • Catalytic cracking catalyst, preparation method and applications thereof
  • Catalytic cracking catalyst, preparation method and applications thereof

Examples

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preparation example Construction

[0085] The preparation method of the catalyst described in the present disclosure can refer to existing methods, for example, according to the methods disclosed in patents CN1098130A and CN1362472A. Typically comprising the steps of forming a slurry comprising modified Y molecular sieve, binder, clay and water, spray drying, optionally washing and drying. Spray drying, washing, and drying are prior art, and there is no special requirement in this disclosure.

[0086] The second aspect of the present disclosure provides a method for preparing the catalytic cracking catalyst described in the first aspect of the present disclosure. The method includes: preparing a modified Y-type molecular sieve, forming a modified Y-type molecular sieve comprising the modified Y-type molecular sieve, alumina binder, clay and water slurry, and spray drying to obtain the catalytic cracking catalyst;

[0087] Wherein, the preparation of modified Y-type molecular sieve comprises the following steps...

Embodiment approach

[0106] 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.

[0107] In the preparation method of catalytic cracking catalyst provided by the present disclosure, the phosphorus-modified molecular sieve can be contacted with a solution containing active elements, and then exchanged and / or impregnated to load the active elements on the modified Y-type molecular sieve. In order to improve the effect of exchange and / or immersion treatment, the solution containing active elements is preferably an aqueous solution of gallium salt or boron compound or a...

specific Embodiment approach

[0128] In a third specific embodiment of the present disclosure, the method for preparing a modified Y-type molecular sieve comprises the following steps:

[0129] (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.;

[0130] (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 invention relates to a catalytic cracking catalyst, a preparation method and applications thereof, wherein the catalyst comprises 10-50 wt% of a modified Y-type molecular sieve, 10-40 wt% of an alumina binder (calculated as alumina), and 10-80 wt% of clay (calculated as dry base), wherein the modified Y-type molecular sieve comprises 4-11 wt% of rare earth elements (calculated as oxide), 0.05-10 wt% of phosphorus (calculated as P2O5), not more than 0.5 wt% of sodium oxide and 0.1-5 wt% of an active element oxide, the active element is gallium and/or boron, the total pore volume of the modified Y-type molecular sieve is 0.36-0.48 mL/g, the pore volume of the secondary pores with a pore size of 2-100 nm accounts for 20-40% of the total pore volume, the cell constant is 2.440-2.455 nm, the lattice collapse temperature is not lower than 1060 DEG C, the non-skeleton aluminum accounts for not more than 10% of the total aluminum content, and a ratio of the amount of the acid B to the amount of the acid L in the amount of the strong acid of the modified Y-type molecular sieve is not less than 3.5. According to the invention, with the application of the catalyst in processing hydrogenation of LCO, the catalyst has high LCO conversion efficiency, low coke selectivity and high yield of gasoline rich in aromatic hydrocarbon.

Description

technical field [0001] The present disclosure relates to a catalytic cracking catalyst 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J37/30B01J37/10C10G49/08
CPCB01J29/088B01J37/0018B01J37/10B01J37/28B01J37/30B01J2229/18C10G49/08
Inventor 周灵萍沙昊张蔚琳袁帅许明德陈振宇姜秋桥田辉平
Owner CHINA PETROLEUM & CHEM CORP
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