Gas phase aluminium extracting and silicon supplementing method of molecular sieve

Abstract

The gas phase method of extracting aluminum from and supplementing silicon to molecular sieve is to contact molecular sieve with silicon tetrachloride inside one reaction apparatus. The reaction apparatus includes one reactor with material inlet, gas outlet and stirrer, and one gas-solid separator in the gas outlet. The gas-solid separator has suck pore diameter and porosity that the gas can pass through and the solid particle can not. The stirrer has stirring rod extending beyond the reactor hermetically. The contact under stirring has contact temperature of 100-500 deg.c and time of 5-10 min, and the weight ratio between the molecular sieve and silicon tetrachloride is 1 to 0.05-0.5. The said method homogeneous contact reaction between gaseous silicon tetrachloride and solid molecular sieve, no coagulation of solid molecular sieve, less environmental pollution, lowered production cost and other advantages, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for extracting aluminum and supplementing silicon from a molecular sieve, more specifically to a method for extracting aluminum and supplementing silicon in a gas phase of a molecular sieve. Background technique [0002] Molecular sieves are widely used materials, such as active components of catalysts and adsorbents. According to different needs, various modifications can be made to molecular sieves. For example, in the field of catalysis, there is a greater demand for high-silicon molecular sieves. [0003] In the prior art, there are roughly three methods for extracting aluminum from molecular sieves to increase the silicon content of molecular sieves, namely, chemical aluminum extraction, hydrothermal aluminum extraction, and gas phase aluminum extraction for silicon supplementation. [0004] The method of chemically extracting aluminum is generally to use an acidic solution to conta...

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Problems solved by technology

[0013] Since the method provided by the invention is carried out under stirring, the molecular sieve solid particles are evenly rolled under stirring, which not only overcomes the poor mass transfer and heat transfer performance of the fixed bed, the difficult control of the reaction conditions, and the uneven reaction temperature, which is easy to cause local overheating It also makes the contact reaction between silicon tetrachloride gas and molecular sieve solid particles more uniform, easy to control, and avoids the phenomenon of coalescence of molecular sieve solid particles into dense lumps. Therefore, molecular sieves with more uniform properties can be obtained product

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