Method for preparing molecular sieve

Abstract

The invention relates to a method for preparing a molecular sieve, which comprises the following steps: the molecular sieve is introduced in a gas phase ultra-stable reactor, the gas phase ultra-stable reactor is capable of moving the molecular sieve from the molecular sieve inlet of the gas phase ultra-stable reactor to the molecular sieve outlet of the gas phase ultra-stable reactor under the condition that carrying gas is not used for conveying, and the molecular sieve and gas-phase silicon tetrachloride are contacted for reacting in the gas phase ultra-stable reactor. The conveying of the molecular sieve does not require inertia carrying gas, the technology flow is simplified, carrying gas amount is saved, and the consumption of silicon tetrachloride can be greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves, and more particularly relates to a method for preparing molecular sieves by using a gas-phase chemical method to extract aluminum and supplement silicon. 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 ...

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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 will easily cause the problem of device blockage. Increasing the amount of gas will make it difficult to increase the reaction depth of dealumination and silicon supplementation. There is a contradiction between the solid material transportation and the improvement of the gas phase ultra-stable reaction depth. In addition, In order to achieve a certain degree of reaction, this method requires a large 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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