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Catalytic cracking catalyst, preparation method and application thereof, and catalytic cracking method

A catalytic cracking and catalyst technology, applied in the field of catalytic cracking and hydrocarbon oil catalytic cracking, can solve the problems of low yield of low-carbon olefins, insufficient cracking capacity of heavy and inferior crude oil, etc., and achieve the effect of improving pore structure and improving stability

Pending Publication Date: 2021-10-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a catalyst for catalytic cracking, its preparation method and application and a method for catalytic cracking in order to overcome the problems of insufficient cracking ability of catalysts for heavy and inferior crude oil and low yield of low-carbon olefins in the prior art , when the catalyst is applied in the cracking reaction, the cracking ability is stronger, the yield of light olefins is higher and the selectivity of propylene is higher

Method used

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  • Catalytic cracking catalyst, preparation method and application thereof, and catalytic cracking method
  • Catalytic cracking catalyst, preparation method and application thereof, and catalytic cracking method
  • Catalytic cracking catalyst, preparation method and application thereof, and catalytic cracking method

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Embodiment approach

[0058] According to a preferred embodiment of the present invention, in the modified ZSM-5 molecular sieve, the mesopore volume with a pore diameter of 5nm to 20nm accounts for more than 85% of the total mesopore volume, more preferably more than 90%, for example, 90-96% of the total mesopore volume. %. In this preferred situation, the pore structure of the modified ZSM-5 molecular sieve is conducive to improving the catalytic performance of the modified ZSM-5 molecular sieve in the catalytic cracking reaction.

[0059] According to the present invention, preferably, the mesopore volume of the modified ZSM-5 molecular sieve accounts for 30-50% of the total pore volume of the modified ZSM-5 molecular sieve. In this preferred situation, it is beneficial to the generation and diffusion of the intermediates and products of the isomerization reaction and aromatization reaction, thereby avoiding the coking and deactivation of the modified ZSM-5 molecular sieve.

[0060] According t...

specific Embodiment approach

[0091] The present invention has a wide selection range for the first solvent described in step (1), as long as the environment in which the ZSM-5 molecular sieve contacts with alkali and alkaline earth metal elements can be provided. Preferably, the first solvent is water. The present invention has no particular limitation on the water, which can be water of various hardness, and commonly used tap water, distilled water, purified water and deionized water can all be used. In a specific embodiment of the present invention, the first solvent is neutral water, which is also called distilled water.

[0092] The present invention has a wide range of options for the amount of the first solvent, and can be properly selected according to the amount of the ZSM-5 molecular sieve and the compound of alkali and alkaline earth metal, as long as the environment that makes the contact in step (1) can be provided That's it. Preferably, relative to 100 parts by weight of the ZSM-5 molecular...

Embodiment 1

[0181] Prepare catalytic cracking catalyst according to the method of the present invention, concrete steps are as follows:

[0182] (1) Take ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 27) 100g (dry basis weight), add 600g neutral water (also known as distilled water in the present invention), 20g of NaOH solution (molar concentration is 0.833mol / L) and 20g of MgO, heat up to 70°C, contact After reacting for 2 hours, cool to room temperature, then filter, wash and dry successively to obtain a solid product; the filtrate is obtained for subsequent use, and the element content in the filtrate is determined by an ICP analysis method. In the filtrate, aluminum in terms of oxides and silicon in terms of oxides The total weight content is 7% by weight, and the specific components are listed in Table 1.

[0183] (2) get the solid product 80g (dry basis weight) that step (1) obtains, make a slurry with 640g water, then add the H of 20% by weight that the weight conte...

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Abstract

The invention relates to the field of hydrocarbon oil catalytic cracking, and discloses a catalytic cracking catalyst. The catalyst comprises a modified ZSM-5 molecular sieve, a binder and optional clay, on the basis of the dry base weight of the catalyst, the content of the modified ZSM-5 molecular sieve in terms of dry base is 20-60 wt%, the content of the clay in terms of dry base is 0-50 wt%, and the content of the binder in terms of oxide is 10-40 wt%; the modified ZSM-5 molecular sieve comprises a ZSM-5 molecular sieve and alkaline earth metal elements; on the basis of the dry basis weight of the modified ZSM-5 molecular sieve, in terms of oxide, the content of the alkaline earth metal element is 10-30 wt%; and the molar ratio of SiO2 to Al2O3 of the modified ZSM-5 molecular sieve is 15-50. When the catalyst is applied to a cracking reaction, the cracking capability is stronger, the yield of low-carbon olefin is higher, and the propylene selectivity is higher.

Description

technical field [0001] The invention relates to the field of catalytic cracking of hydrocarbon oil, in particular to a catalytic cracking catalyst, a preparation method and application thereof, and a catalytic cracking method. Background technique [0002] my country's propylene production capacity has grown rapidly in recent years. my country's crude oil is heavy, and light hydrocarbons and naphtha resources are scarce. Therefore, the development of catalytic cracking technology that produces more propylene is suitable for my country's national conditions. [0003] Some domestic research institutes attach great importance to the research of low-carbon olefin production technology. In the late 1980s, the Academy of Petrochemical Sciences (referred to as "Science Academy") developed a catalytic cracking technology (DCC) that uses heavy oil as a raw material to produce light olefins. The process uses a modified five-membered ring mesoporous zeolite catalyst , use the riser pl...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J35/10C07C4/06C07C11/04C07C11/06C07C9/04
CPCB01J29/405B01J23/002C07C4/06C07C2529/40B01J2229/18B01J2523/00B01J35/615B01J35/633B01J35/647C07C11/04C07C11/06C07C9/04B01J2523/12B01J2523/22B01J2523/51B01J2523/305B01J2523/3712B01J2523/47B01J2523/48B01J2523/23Y02P20/52
Inventor 张杰潇于善青凤孟龙李家兴杨民田辉平
Owner CHINA PETROLEUM & CHEM CORP
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