Method for preparing catalytic cracking catalyst

Abstract

The invention relates to a method for preparing a catalytic cracking catalyst. The method comprises the following steps: a molecular sieve flows along with inert carrier gas under the condition of being carried by the inert carrier gas flow, and is in contact with gas phase SiCl4 under the flow state; the contact time between the molecular sieve and the gas phase SiCl4 is 10 seconds to 100 minutes; and then the molecular sieve in contact with the gas phase SiCl4 is mixed with a binding agent, clay and water for pulping and pelleting to obtain the catalytic cracking catalyst. The provided preparation method for the catalytic cracking catalyst can realize the continuous contact reaction between the molecular sieve and the gas phase SiCl4 and can control the contact time between the molecular sieve and the gas phase SiCl4 by controlling the flow velocity of the carrier gas and the length of the tubular reactor, so that the contact reaction between the molecular sieve and the gas phase SiCl4 can be fully carried out in the tubular reactor.

Description

technical field [0001] The invention relates to a preparation method of catalytic cracking catalyst. 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 a high silicon-aluminum ratio, there are mainly the following methods: ammonium fluorosilicate method for aluminum and silicon supplementation, hydrothermal method for aluminum and silicon supplementation, and gas phase chemical method for aluminum and silicon supplementation. [0004] The method of ammonium fluorosilicate to...

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Problems solved by technology

And, in the method of above-mentioned prior art, in order to guarantee the high silicon content of the obtained molecular sieve, generally all make SiCl 4 far excess, excess SiCl 4 Undoubtedly increased production costs and environmental protection costs

On the other hand, the above-mentioned methods all require very complicated manual operations, such as: manual loading, manual unloading and long-term purging of pipelines after the completion of the reaction, which not only bring about high labor intensity but also low production efficiency. problems, moreover, molecular sieve dust and excess SiCl during loading and unloading 4 It also causes serious environmental pollution and seriously endangers the health of operators.

Therefore, the above-mentioned tank-type gas-phase ultra-stable process is difficult to carry out industrial production

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