Method for synthesizing zeolite molecular sieve or SAPO molecular sieve, and apparatus thereof

Abstract

The invention belongs to the technical field of chemical engineering, and concretely relates to a method for synthesizing zeolite molecular sieve or SAPO molecular sieve, and an apparatus thereof. The synthesis method is characterized in that a gas-solid phase reaction of amorphous nonmetal oxide reactant dry glue in a pressure reactor is carried out in continuously flowing directing agent steam to form the zeolite molecular sieve or SAPO molecular sieve, the liquid hourly space velocity of the continuously flowing directing agent steam before vaporization is 1-50hr<-1>, the pressure in the pressure reactor is 0.1-1.5MP, and the reaction temperature is 100-200DEG C; and the directing agent steam discharged from the outlet of the reactor undergoes pressure reduction to normal pressure, and is cooled to a liquid which can be recycled. The synthesis reaction temperature and pressure, the composition of the above directing agent and the flow velocity of the steam can be adjusted, the crystallization process can be accelerated, and the obtained product has the advantages of pure phase, perfect crystal form, and small and uniform crystal grain size. The directing agent can be recycled, no waste gas or waste liquid is discharged, and realization of low-cost environmentally friendly large-scale industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method and a device for synthesizing zeolite molecular sieves or SAPO molecular sieves. Background technique [0002] As we all know, zeolite molecular sieves, including aluminum phosphate (AlPO) and silicoaluminophosphate (SAPO) molecular sieves, have been widely used as catalysts, adsorbents, and ion exchangers in industry, and are extremely useful in the fields of oil refining, petrochemical, fine chemical, and environmental protection. important and widely used. In the synthesis of zeolite molecular sieves, the raw materials are usually made into insoluble amorphous aluminosilicate or phosphorous-aluminosilicate sol or gel state reactants according to a certain proportion, and placed in a sealed pressure-resistant reactor and heated to a certain temperature. Under the pressure formed by the reactor itself, the reactants gradually crystallize into zeol...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a new method and device for the synthesis of zeolite molecular sieves or silicoaluminophosphate (SAPO) molecular sieves through vapor-solid phase reaction crystallization of dry glue, so as to overcome the mass transfer in the static vapor-solid phase reaction synthesis of dry glue. The limitation of heat conduction speed makes the crystallization speed slow, miscellaneous crystals are easy to form, the crystal shape of the product is irregular, and the grain size is uneven.

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