Catalytic cracking catalyst and preparation method thereof

A catalytic cracking and catalyst technology, used in catalytic cracking, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of molecular sieve crystallinity destruction, inability to obtain silicon-aluminum ratio, and high coke selectivity, and achieve high heat and hydrothermal stability. properties, reducing coke formation, and high coke selectivity

Active Publication Date: 2018-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth-containing high-silicon Y-type zeolite can be prepared by performing multiple rare-earth ion exchanges and multiple high-temperature roasting on NaY zeolite. The disadvantages of zeolite are: because too harsh hydrothermal treatment conditions will destroy the structure of zeolite, Y-type zeolite with high silicon-alumina ratio cannot be obtained; although the production of aluminum outside the framework is very important for improving the stability of zeolite and forming new acid centers Beneficial, but too much aluminum outside the framework reduces the selectivity of zeolite; in addition, many dealuminated holes in zeolite cannot be filled by silicon migrated from the framework in time, often resulting in lattice defects of zeolite, and the crystallization of zeolite remains Therefore, the thermal and hydrothermal stability of the rare earth-containing high-silicon Y-type zeolite prepared by the hydrothermal method is relatively poor, which is manifested in the low lattice collapse temperature, the crystallinity retention rate and the ratio of crystallinity after hydrothermal aging. low surface area retention
[0014] It can be seen that the high-silicon Y-type molecular sieve prepared by the simple hydrothermal method requires multiple times of high-temperature steam roasting and multiple r

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  • Catalytic cracking catalyst and preparation method thereof
  • Catalytic cracking catalyst and preparation method thereof
  • Catalytic cracking catalyst and preparation method thereof

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preparation example Construction

[0051] The invention provides a method for preparing a catalytic cracking catalyst. The method comprises: sequentially performing ion exchange reaction, hydrothermal ultra-stable treatment, first roasting, gas-phase chemical dealumination and silicon-replenishing reaction on NaY molecular sieve, and gas-solid separation to obtain a modified Molecular sieve, and then the obtained modified molecular sieve is gelled with clay and binder, and the obtained gelled product is sequentially dried and secondly roasted. The method of the hydrothermal ultra-stable treatment and the first roasting makes the first The temperature of the calcined molecular sieve is 350-600 DEG C, and the solid content is not lower than 98% by weight.

[0052] In the present invention, the solid content of the molecular sieve is the weight ratio of the weight of the molecular sieve after high-temperature roasting to the weight before roasting (that is, the calcined base content, see RIPP32-90 analysis method, ...

Embodiment approach

[0053] According to a preferred embodiment of the present invention, the method of the hydrothermal ultra-stable treatment and the first calcination makes the temperature of the molecular sieve after the first calcination be 400-550° C., and the solid content is not lower than 99% by weight. According to the preferred embodiment of the present invention, it is more beneficial to prepare molecular sieves with high crystallinity and good thermal and hydrothermal stability by subjecting molecular sieves with specific temperature and solid content to the subsequent gas-phase chemical dealumination and silicon supplementation reaction.

[0054] According to a preferred embodiment of the present invention, the conditions of the hydrothermal ultra-stable treatment include: the temperature is 350-480°C, the time is 0.5-3h, and the amount of superheated steam is 0.15-0.45 per kilogram of molecular sieve. kg, more preferably, the temperature is 390-460°C, the time is 1-2.5h, and the amou...

Embodiment 1

[0193] The preparation method of the catalyst provided in this embodiment is as follows: figure 2 The shown equipment is used to prepare catalytic cracking catalyst (NaY molecular sieve is commercially available, so the NaY molecular sieve synthesis reactor 111 and the first filter device 112 are not used). in,

[0194] (1) In the NaY molecular sieve exchange device 113, 3000kg NaY molecular sieve (on a dry basis) is mixed with decationized water, and then RE (NO 3 ) 3 Solution (rare earth solution concentration is RE 2 o 3 Calculated as 335g / L), among them, NaY molecular sieve (in dry basis), rare earth salt (in RE 2 o 3 ) and water with a weight ratio of 1:0.18:15, carry out ion exchange reaction in NaY molecular sieve exchange device 113, the temperature of ion exchange reaction is 95°C, the time is 50min, and the molecular sieve slurry that has been exchanged is passed through the second filter The device 114 (belt filter) filters and washes to obtain a filter cake....

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Abstract

The invention relates to the field of catalytic cracking catalyst preparation, and discloses a catalytic cracking catalyst and a preparation method thereof. The method comprises the following steps: sequentially carrying out ion exchange reaction, hydro-thermal ultra-stabilization treatment, first roasting, gas-phase chemical isomorphous substitution reaction, and gas-solid separation on a NaY molecular sieve, so as to obtain a modified molecular sieve, then carrying out gelling on the obtained modified molecular sieve with clay and an adhesive, and sequentially carrying out drying and secondary roasting on the obtained gelling product, wherein the temperature of the molecular sieve subjected to the first roasting is 350-600 DEG C through the hydro-thermal ultra-stabilization treatment andthe first roasting method, and the solid content is not lower than 98 wt%. The preparation method provided by the invention is simple in process flow, the production energy consumption of the catalytic cracking catalyst is greatly reduced, and the prepared catalytic cracking catalyst has relatively high conversion rate, light-oil yield and liquid yield, and has relatively low coke selectivity.

Description

technical field [0001] The invention relates to the field of catalytic cracking catalyst preparation, in particular to a catalytic cracking catalyst and a preparation method thereof. Background technique [0002] Molecular sieve is a widely used material in catalytic cracking catalyst, and it is also a very important component. The performance of molecular sieve directly affects the reaction performance of catalytic cracking catalyst. According to different needs, molecular sieves can be modified differently to meet the requirements of use. For example, molecular sieves with a high silicon-to-aluminum ratio are generally considered to be required for catalytic cracking catalysts. [0003] In the preparation of molecular sieves with high silicon-aluminum ratio, there are mainly the following methods: ammonium fluorosilicate method to extract aluminum and supplement silicon, hydrothermal method and gas phase chemical method to extract aluminum and supplement silicon (the pres...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J35/10C10G11/05
CPCB01J29/088B01J35/1023B01J35/1038B01J2029/081B01J2229/16B01J2229/18B01J2229/24C10G11/05C10G2400/02C10G2400/04C10G2400/06
Inventor 周灵萍许明德张蔚琳陈振宇袁帅田辉平
Owner CHINA PETROLEUM & CHEM CORP
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