A kind of method for preparing catalytic cracking catalyst

Abstract

The invention relates to a catalytic cracking catalyst production method, which comprises that: a molecular sieve is introduced into a gas phase ultra-stable reactor, such that the molecular sieve can move to the molecular sieve outlet of the gas phase ultra-stable reactor from the molecular sieve inlet of the gas phase ultra-stable reactor in the case of no requirement of conveying of the molecular sieve through carrier gas; the molecular sieve and gas phase silicon tetrachloride can be subjected to a contact reaction in the gas phase ultra-stable reactor; and the reacting molecular sieve is washed, the washed molecular sieve and a matrix are subjected to mixing pulping to prepare a pulp, and spray drying is performed. With the method, the inert carrier gas is not required to be adopted to convey the molecular sieve, the process is simplified, the carrier gas use amount is saved, the silicon tetrachloride consumption is reduced, and the obtained catalyst has the excellent catalytic cracking effect.

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 terms of preparing molecular sieves with high silicon-aluminum ratio, there are mainly the following methods: ammonium fluorosilicate method to extract aluminum and replenish silicon, hydrothermal method and gas phase chemical method to extract aluminum and replenish silicon (this invention is called gas phase ultra-stable method). [0004] The ammonium fluorosilica...

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Problems solved by technology

However, this method uses gas to carry the molecular sieve powder material and SiCl 4 The gas phase ultrastable reaction is carried out by means of gas contact reaction. In order to fluidize the molecular sieve, the amount of gas must be large enough. The carrier gas and SiCl 4 The weight ratio can reach 10-250, otherwise it is easy to cause the problem of device blockage, increasing the amount of gas makes it difficult to increase the reaction depth, and there is a contradiction between the solid material transportation and the improvement of the gas phase ultra-stable reaction depth. A certain degree of reaction requires a larger SiCl 4 The amount of input will inevitably cause the residual SiCl after the gas phase ultrastable reaction 4 The increase in the amount of exhaust gas not only aggravates the harm of environmental pollution, but also is not conducive to the effective absorption of exhaust gas.

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