Post-treatment method for washing, drying and calcining SAPO (silicoaluminophosphate) molecular sieve

Abstract

The invention discloses a post-treatment process for washing, drying and calcining an SAPO (silicoaluminophosphate) molecular sieve. The process is characterized in that aiming at the production characteristics of an SAPO molecular sieve, a crystalized molecular sieve stock solution is filtered by a primary section of a belt filter, and is washed twice by secondary and tertiary sections of the belt filter, and is formed into a filter cake at the tail end of the belt filter; the filter cake is dried by using a spin flash drying device to form dried fine powder; and the dried fine powder is collected by a cloth envelope collector, and is calcined by using a rotary kiln to complete removing an organic amine template agent in a molecular sieve channel, so that the SAPO molecular sieve product with catalytic activity can be obtained. Meanwhile, high-temperature tail gas generated in calcination of the rotary kiln can be used as a heat source and returned to the spin flash drying device. The process has the characteristics of continuous operation, high automatic degree, sufficient utilization of high-temperature heat source, low comprehensive energy consumption, and no dust pollution because dust is operated in closed equipment or pipeline.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology, and in particular relates to a post-treatment method of washing, drying and roasting of SAPO molecular sieves. Background technique [0002] SAPO molecular sieves have good catalytic activity, especially in the development field of methanol to olefins technology. The use of SAPO molecular sieves can realize methanol instead of petroleum as the raw material for the production of olefins, so that the production of olefins can get rid of the excessive dependence on petroleum. It has very important strategic significance for some areas with large coal reserves. [0003] In recent years, SAPO molecular sieves have always been the focus of attention in the field of catalysts and have good application prospects. There have been reports in the literature on the treatment methods of synthetic SAPO molecular sieves. Generally, the more traditional method is as follows, using a pla...

AI Technical Summary

Problems solved by technology

However, the process of plate and frame filtration has the problems of manpower consumption, large water consumption, and long time consumption. At the same time, the drying and roasting process has problems such as manpower consumption, large energy consumption, and long time consumption.

These problems greatly affect the preparation process of SAPO molecular sieves. Therefore, a new SAPO molecular sieve treatment process needs to be developed and applied urgently.

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