Synthesis method of SAPO-34 molecular sieve, synthesized molecular sieve and application thereof

Abstract

The invention discloses a synthesis method of an SAPO-34 molecular sieve, a synthesized molecular sieve and an application thereof in a reaction for preparing olefin from an oxygen-containing compound. The method comprises the following steps: carrying out hydrothermal crystallization on a mixture I formed by a silicon source, a phosphorus source, an aluminum source, a template agent and water to obtain a guiding agent A containing a seed crystal; preparing a mixture II from a phosphorus source, an aluminum source, a silicon source and water to prepare silicon-phosphorus-aluminum dry glue B; mixing the silicon-phosphorus-aluminum dry glue B with a guiding agent A to obtain a mixture III; and carrying out hydrothermal treatment on the mixture III at 140-170DEG C for 0.1-12h, and carrying out hydrothermal crystallization at 180-220DEG C for 2-48h to obtain the SAPO-34 molecular sieve. By adopting the synthesis method disclosed by the invention, the yield of the molecular sieve is high, the synthesized SAPO-34 molecular sieve is high in crystallinity and good in product quality, and the SAPO-34 molecular sieve has the advantage of high yield of low-carbon olefin when being used in the reaction of preparing olefin from an oxygen-containing compound.

Description

technical field [0001] The invention relates to a synthesis method of SAPO-34 molecular sieve, the synthesized molecular sieve and its application. Background technique [0002] Ethylene and propylene are important basic raw materials of modern petrochemical industry. The traditional production methods of ethylene and propylene rely on petroleum raw materials, combined with the actual distribution of fossil energy in China that is "rich in coal, poor in gas, and low in oil", to improve and transform the production level of China's coal chemical industry, and to develop new coal chemical technology is in line with China's national security and energy strategy. The route of methanol to olefins has attracted extensive attention because the feedstock can be obtained from synthesis gas in large quantities, cheaply and conveniently. Therefore, it is of great significance to obtain high yields of ethylene and propylene from methanol conversion. [0003] The core of methanol-to-ol...

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Problems solved by technology

[0008] Aiming at the problems of low molecular sieve yield and poor product quality in the gas phase method in the prior art, the present invention provides a synthesis method of SAPO-34 molecular sieve, the synthesized molecular sieve and its application

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