Method for synthesizing SAPO-35 molecular sieve

A technique for the synthesis of SAPO-35, which is applied in the direction of molecular sieves, alkali-exchanged phosphates, molecular sieve characteristic silicoaluminophosphates, etc., to achieve the effects of high product yield, high specific surface area, good thermal stability and hydrothermal stability
CN101397143AActive Publication Date: 2009-04-01CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2009-04-01

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Abstract

The invention provides a method for synthesizing a SAPO-35 molecular sieve, comprising the steps as follows: aluminium source, silicon source, phosphor source and organic template agent are mixed as glue so as to prepare reaction mixture with the mol composition of aR:Al2O3:bP2O5:cSiO2:dh2O under the temperature of 35-100 DEG C; the mixture is hydro-thermally crystallized for 0.5-500 hours under the temperature of 150-210 DEG C and the self-pressure; the SAPO-35 molecular sieve is gained by recovering crystallized product; wherein, the organic template agent is hexamethylene imine; wherein, a is 0.5-1.8; b is 0.5-1.5, c is 0.05-2.5 and d is 10-150; the method can synthesize the SAPO-35 molecular sieve with high crystallinity under wide silicon content range; the structure of the SAPO-35 molecular sieve synthesized by the method is basically unchanged before and after the release agent is baked and deprived under high temperature and the SAPO-35 molecular sieve has high specific surface area. The molecular sieve has extremely low alkane selection when being applied to the olefin preparation reaction from dehydration of carbinol; furthermore, the outcome yield of ethane and propylene is high.
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Description

technical field

[0001] The invention relates to a method for synthesizing SAPO-35 molecular sieves, more specifically, a method for synthesizing SAPO-35 molecular sieves using hexamethyleneimine as a template. Background technique

[0002] Aluminum phosphate molecular sieve is a new generation of molecular sieve (US4310440) invented by UCC Company in the United States in the early 1980s after aluminum silicate molecular sieve. Since the molecular sieve framework is electrically neutral, it has no cation exchange performance and catalytic reaction performance. Aluminum phosphate molecular sieves are a series of molecular sieves with unique XRD characteristic spectra and data. Among them, there are molecular sieves with the same crystal structure as the existing aluminum silicate molecular sieves, and there are also new structures that are not found in the existing aluminum silicate molecular sieves. of molecular sieves.

[0003] Introducing silicon into the framework of alu...

Claims

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