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Method for ammonia-free preparation of catalytic cracking catalyst

A catalytic cracking and catalyst technology, applied in catalytic cracking, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve problems such as direct discharge of salty wastewater to pollute the environment, preparation methods not reported, poor mass and heat transfer effects, etc. Achieve the effect of reducing the burden of sewage treatment, avoiding the discharge of "three wastes" and reducing the cost of preparation

Active Publication Date: 2017-05-31
REZEL CATALYSTS CORP
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Problems solved by technology

It can be seen that in this method, the molecular sieve concentration in the reactor is high, the bed density is higher, and the molecular sieve is in a dense phase state with silicon tetrachloride in the pipeline, and the mass transfer and heat transfer effect is poor, which will cause different properties of the product; in addition, The silicon tetrachloride gas is not diluted by the carrier gas, and the high-concentration silicon tetrachloride gas contacts with the molecular sieve particles, the reaction is stronger and the crystal form is greatly damaged, resulting in serious collapse of the molecular sieve structure, a sharp drop in product crystallinity, and a large amount of release The heat cannot be taken away by the carrier gas, and it is easy to cause local overheating of the molecular sieve bed; at the same time, the molecular sieve is not washed after the reaction, and it is directly mixed with the substrate and water for beating, so that Na + , NH 4 + , SO 4 2- Harmful ions such as ions re-enter molecular sieves and catalysts; and after the silicon tetrachloride tail gas reacts with lye in the absorption tower, it is directly discharged as waste water, which will cause great damage to the environment
[0037] CN103785437A, CN103785438A, CN103787352A, CN104549445A, on the basis of the above method, increase the washing process of the molecular sieve after the reaction, but there are still poor mass and heat transfer effects, different properties of the product, local overheating of the reaction, and direct discharge pollution of salty wastewater environmental issues
At present, the preparation method of similar catalytic cracking catalyst has not been reported

Method used

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  • Method for ammonia-free preparation of catalytic cracking catalyst
  • Method for ammonia-free preparation of catalytic cracking catalyst
  • Method for ammonia-free preparation of catalytic cracking catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Embodiment 1: get the NaY molecular sieve former powder slurry (12.6wt% of sodium oxide content, unit cell constant 24.69Å, skeleton n (SiO 2 ) / n(Al 2 o 3 ) is 5.6, crystallinity 95%), according to the NaY molecular sieve former powder of 35wt% and 38wt% kaolin (Suzhou kaolin, alumina content 44.6wt%, sodium oxide+potassium oxide content 0.3wt%, high Ridge stone content 86wt%), 7% weight rare earth oxide, 20wt% composite binder (among them aluminum sol 50wt%; Pseudoboehmite 50wt%, produced by Aluminum Corporation of China Shandong Branch, sodium oxide content 0.3 wt%, specific surface area 280m 2 / g), with deionized water to obtain a solid content of 30% slurry after spray molding, made spray microspheres.

[0102] The obtained spray microspheres were cured at 450° C. for 5 hours to obtain cured microspheres.

[0103] The obtained cured microspheres are cured at high temperature and cooled to 150°C, and then according to the weight ratio of halogen-containing gas mo...

Embodiment 2

[0105] Embodiment 2: get the NaY molecular sieve former powder slurry (11.8wt% of sodium oxide content, unit cell constant 24.67Å, skeleton n (SiO 2 ) / n(Al 2 o 3 ) is 5.4, crystallinity 93%) and NaZSM-5 molecular sieve powder dry powder (sodium oxide content 4.8wt%), according to the molecular sieve powder (wherein NaY accounts for 98.5wt%; NaZSM-5 Accounting for 1.5wt%, 39.5wt% kaolin (Maoming kaolin, alumina content 37.5wt%, sodium oxide + potassium oxide content 0.35wt%, kaolinite content 87wt%), 6% weight rare earth oxide, 21wt% composite Binder (including 48wt% aluminum sol; 52wt% pseudoboehmite, produced by Zibo Shuoren Alumina Technology Co., Ltd., with a sodium oxide content of 0.05wt% and a specific surface area of ​​320m 2 / g), and deionized water is prepared with deionized water to obtain a slurry with a solid content of 34% and then sprayed to form spray microspheres.

[0106] The obtained spray microspheres were cured at 500° C. for 3.5 hours to obtain cured mi...

Embodiment 3

[0109] Embodiment 3: getting water content is the former powder filter cake of NaY molecular sieve of 25wt% (sodium oxide content 11wt%, unit cell constant 24.66Å, skeleton n (SiO 2 ) / n(Al 2 o 3 ) is 5.4, crystallinity 92%) and NaZSM-5 molecular sieve former powder dry powder (sodium oxide content 4.6wt%), according to the molecular sieve former powder of 32wt% based on catalyst dry basis (wherein NaY accounts for 96wt%; NaZSM-5 accounts for 4wt% %), 41wt% kaolin (Fujian Longyan kaolin, alumina content 45.1wt%, sodium oxide + potassium oxide content 0.55wt%, kaolinite content 82wt%), 5% weight rare earth oxide, 22wt% composite binder (Alumina sol 46wt%; pseudo-boehmite 54wt%, produced by Qingdao Shanke Haitai New Material Co., Ltd., sodium oxide content 0.3wt%, specific surface area 260m 2 / g), with deionized water to obtain a solid content of 38% slurry after spray molding, made spray microspheres.

[0110] The obtained spray microspheres were cured at 550° C. for 3 hours ...

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Abstract

The invention discloses a method for ammonia-free preparation of a catalytic cracking catalyst. The method is characterized by comprising the following steps: mixing and beating NaY molecular sieve raw powder or / and NaZSM-5 molecular sieve raw powder, clay, an adhesive and rare earth-containing / free de-ionized water for spray granulation, causing obtained spray microspheres to contact with halogen-containing gas for gaseous ion exchange reaction after high-temperature curing, and washing and drying a reaction product to obtain a catalytic cracking catalyst finished product.

Description

technical field [0001] The present invention relates to the technical field of preparation of oil refining catalysts, in particular to a method for preparing catalytic cracking catalysts, and more specifically to a method for preparing high-silicon and low-sodium catalytic cracking catalysts using gas-phase ion exchange to achieve the purpose of preparing high-silicon and low-sodium catalytic cracking catalysts in a short process without ammonia . [0002] technical background [0003] As we all know, the petroleum refining industry is an important pillar of the national economy. Its industrial chain is long, its products cover a wide range, and it is closely related to people's lives. The most important refining method in the petroleum refining process is catalytic cracking technology. 70% of the gasoline, 40% of diesel, and 40% of propylene in my country's daily needs come from catalytic cracking, and the catalytic cracking catalyst is catalytic cracking. core content. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J29/40C10G11/05
Inventor 王洪飞卓润生王韵金张平
Owner REZEL CATALYSTS CORP
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