Method for preparing molecular sieve

Abstract

The invention relates to a method for preparing a molecular sieve. The method comprises that: with carrying by inert carrier gas flow, a molecular sieve flows along with the inert carrier gas, and contacts gas phase SiCl4 for 10 s-100 min under a flowing state; the molecular sieve and the gas phase SiCl4 are heated during the contacting process, such that the contacting temperature of the molecular sieve and the gas phase SiCl4 is 250-700 DEG C. According to the method for preparing the molecular sieve, the molecular sieve can contact the gas phase SiCl4 under the flowing state, such that the contact reaction of the molecular sieve and the SiCl4 can be continuously performed; with controlling the flow rate of the carrier gas, the contacting time of the molecular sieve and the SiCl4 can be controlled, such that the contact reaction of the molecular sieve and the SiCl4 can be completely performed in a tubular reactor; with heating the molecular sieve and the gas phase SiCl4 during the contacting process, the molecular sieve can contact the gas phase SiCl4 at the different temperatures so as to obtain the molecular sieves with different silica alumina ratios.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves. 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 extract alu...

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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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