A kind of preparation method of ssz-13 molecular sieve

Abstract

The invention discloses a preparation method of an SSZ-13 molecular sieve. According to the method, by adopting the supplement crystallization technology and taking the measures of adding an organic amine crystallization accelerant and seed crystals and the like, the utilization rate of synthesis raw materials is increased, the crystallization induction period is effectively shortened, the synthesis time of the molecular sieve is shortened, and the integrity of molecular sieve crystals is improved. Triethylamine or pyridine and N,N,N-trimethyl-1-adamantyl ammonium hydroxide are used for forming a mixed template agent, expensive N,N,N-trimethyl-1-adamantyl ammonium hydroxide is replaced with triethylamine or pyridine, and thus the synthesis cost of the SSZ-13 molecular sieve is greatly reduced. According to the preferred scheme, sodium tripolyphosphate and guar gum are adopted as flocculant to treat wastewater in filter liquor so as to settle silico-aluminum compounds and the template agent contained in mother liquor, obtained recycled water can be used in production or directly discharged, and thus environmental pollution caused when filter liquor is directly discharged and consequently the chemical oxygen demand (COD) and ammonia-nitrogen compounds of wastewater exceed the standard is avoided.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a preparation method of SSZ-13 molecular sieves. Background technique [0002] SSZ-13 molecular sieve has excellent selective catalytic performance in petrochemical fields such as air purifiers, automobile exhaust catalysts, olefin aromatization and coal-to-olefins, but the current preparation process has high manufacturing costs, low yields, and complex synthetic processes. It is widely used; on the one hand, because the template agent N,N,N-trimethyl-1-adamantyl ammonium hydroxide used in the preparation process of SSZ-13 molecular sieve is expensive, on the other hand, in the crystallization mother liquor The useful components of the crystallization process have not been effectively utilized, and excessive silicon sources, aluminum sources, and organic templates need to be added during the synthesis process to promote the realization of the crystallization process. Th...

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Problems solved by technology

[0002] SSZ-13 molecular sieve has excellent selective catalytic performance in petrochemical fields such as air purifiers, automobile exhaust catalysts, olefin aromatization and coal-to-olefins, but the current preparation process has high manufacturing costs, low yields, and complex synthetic processes. It is widely used; on the one hand, because the template agent N,N,N-trimethyl-1-adamantyl ammonium hydroxide used in the preparation process of SSZ-13 molecular sieve is expensive, on the other hand, in the crystallization mother liquor The useful components of the crystallization process have not been effectively utilized, and excessive silicon sources, aluminum sources, and organic templates need to be added during the synthesis process to promote the realization of the crystallization process. Therefore, the filtered mother liquor after crystallization contains a large amount of silicon Aluminum compounds and templating agents, this kind of sewage discharge will cause the chemical oxygen demand COD and ammonia nitrogen compounds in the sewage to seriously exceed the standard