Method for preparing zeolite molecular sieve catalyst through circulating gas phase method

Abstract

The invention relates to a method for preparing a zeolite molecular sieve catalyst through a circulating gas phase method. The method belongs to the field of catalysts. Water vapor or an organic template agent and water mixed steam are in the continuous circulating state to enable silicon-aluminum dry glue to be completely contacted with the water vapor or the organic template agent and the watermixed steam to improve mass transfer effect between the silicon-aluminum dry glue and the water vapor or the organic template agent and the water mixed steam, increase mass transfer rate and shorten combining time. A high pressure reaction kettle adopts a multi-layer structure and greatly improves single-kettle yield. Pressure of the high pressure reaction kettle can be regulated according to reaction conditions to enable the water vapor or the organic template agent and the water mixed steam to be in saturation, supercooling or superheat states and enable the organic template agent to be recycled repeatedly most importantly. The method reduces discharge of organics containing amine, further reduces consumption of raw materials especially the organic template agent, reduces environment pollution and production cost in the production process, enables the production process to be continuous, and facilitates industrial production.

Description

technical field [0001] The invention relates to a method for preparing a zeolite molecular sieve catalyst by a circulating gas phase method, that is, a method for preparing a zeolite molecular sieve catalyst in continuously circulating steam. Specifically, it refers to the in-situ preparation of zeolite molecular sieve catalysts such as Beta and MCM-22 in continuously circulating water vapor or mixed steam of an organic template agent and water. Background technique [0002] Zeolite molecular sieve has a unique regular crystal structure, and microporous molecular sieve has strong acid center and regular pore structure. These characteristics make it a catalyst with excellent performance. It is widely used in petroleum refining, petrochemical, fine chemical industry and special chemical industry. Synthesis of products and other fields. [0003] The main method for the synthesis of industrial zeolite molecular sieves is the hydrothermal method. The hydrothermal method is curre...

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Problems solved by technology

Compared with the traditional hydrothermal method, the method uses a gas-phase synthesis kettle. Compared with the traditional hydrothermal method, the amount of organic template agent is reduced, the post-treatment process is simple, and the discharge of amine-containing organic matter is reduced at the same time, and the environmental pollution in the production process is reduced; The mass transfer effect of aluminum dry glue and template agent or water vapor is poor, and the operation is batch operation, which is not conducive to industrialization

[0005] Naik et al. used a new type of gas-phase reactor to synthesize zeolite molecular sieves (The Journal of Physical Chemistry B.2003, 107, 29: 7006-7014.), which can control the relative water vapor in the gas-phase synthesis of zeolite molecular sieves. Humidity, to overcome the shortcomings of traditional gas-phase synthesis kettles that are difficult to control the relative humidity of water vapor, and to explore a new route to synthesize zeolite molecular sieves at a specific relative humidity of water vapor

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