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Catalytic cracking catalyst, preparation method and applications thereof

A catalytic cracking and catalyst technology, applied in the direction of catalyst activation/preparation, catalytic cracking, physical/chemical process catalysts, etc., can solve the problems of poor accessibility of active centers, small unit cell constant, high silicon-aluminum ratio, etc., and achieve high crystallinity , uniform aluminum distribution and high propylene yield

Active Publication Date: 2020-02-25
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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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

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preparation example Construction

[0079] 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.

[0080] 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;

[0081] Wherein, the preparation of modified Y-type molecular sieve comprises the following steps...

Embodiment 1

[0122] 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 continuing to stir for 60min, filter, wash, and the filter cake is sent to a flash drying oven for drying; obtain the Y-type molecular sieve of the conventional unit cell size containing rare earth 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 to a roasting furnace at a temperature of 390 ° C and roasted for 6 hours under 50% water vapor (the atmosphere contains 50% by volume of water vapor) Then, at a temperature of 500°C, dry air atm...

Embodiment 2

[0126] 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 3Calculated as 319g / L), stirred for 60min; 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 5.5 wt. %, the unit cell constant is 2.471nm, and the rare earth content is 11.3% by weight in terms of oxides; then, it is sent into a roasting furnace at a temperature (atmosphere temperature) of 450°C and 80% water vapor atmosphere for 5.5h; then, the molecular sieve material enters Carry out roasting and drying ...

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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 (calculated as the weight of the dry base of the modified Y-type molecular sieve) 5-12 wt% of rare earth elements (calculated as oxide), not more than 0.5 wt% of sodium oxide, 0.1-2.5 wt% of gallium oxide, and 0.1-2.5 wt% of zirconium oxide, 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 20-38% 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 is not less than 3.0. According to the invention, with the application of the catalyst in processing hydrogenation of LCO, the LCO conversion efficiency is high, the coke selectivity is low, the yield of gasoline rich in BTX aromatic hydrocarbon and the yield of propylene are high, and the concentration of propylene in liquefied gasis high.

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): B01J29/08B01J35/10B01J37/10B01J37/30B01J37/08C10G11/05
CPCB01J29/088B01J37/10B01J37/30B01J37/082C10G11/05B01J2229/18B01J35/617
Inventor 周灵萍姜秋桥沙昊袁帅许明德张蔚琳陈振宇田辉平
Owner CHINA PETROLEUM & CHEM CORP
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