A kind of preparation method of catalytic cracking auxiliary agent

Abstract

A kind of preparation method of catalytic cracking auxiliary agent, this method comprises preparation high silicon ZSM-5 molecular sieve, the step of mixing beating and granulation of obtained high silicon ZSM-5 molecular sieve with binding agent, clay, wherein said preparation high The silicon ZSM-5 molecular sieve includes: introducing the NaZSM-5 molecular sieve raw powder into the gas-phase superstable reactor, and moving the NaZSM-5 molecular sieve raw powder from the molecular sieve inlet of the gas-phase superstable reactor to the The molecular sieve outlet of the gas-phase ultra-stable reactor, and the NaZSM-5 molecular sieve powder and the gas-phase SiCl4 are contacted and reacted in the gas-phase ultra-stable reactor. The preparation method can continuously prepare the ZSM-5 molecular sieve with a high silicon-aluminum ratio and further prepare the catalytic cracking propylene auxiliary agent.

Description

technical field

[0001] The invention relates to a preparation method of a catalytic cracking additive, more precisely, relates to a method for preparing a ZSM-5 molecular sieve with a high silicon-aluminum ratio by using a gas-phase chemical method to extract aluminum and supplement silicon, and then to prepare a catalytic cracking propylene additive. Background technique

[0002] In addition to the cracking catalyst used in the catalytic cracking process, there are also a variety of catalytic cracking additives that play an auxiliary role. Increase the octane number of gasoline, increase the yield of liquefied gas and the concentration of propylene in it, and promote the conversion of CO into CO 2 , passivate the toxicity of heavy metal impurities in raw materials to catalyst activity and reduce SO in regeneration flue gas x content and so on. The use of additives has many advantages. Adding additives can trigger a certain reaction and work; when the addition of additives...

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