A kind of method for preparing catalytic cracking catalyst by ammonia-free method

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. [...

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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

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