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Synthetic method of easy-to-filter composite-morphology SAPO-34 molecular sieve

A technology of SAPO-34 and synthesis method, which is applied in the field of molecular sieves, can solve problems such as compact packing, reduced particle size of molecular sieves, difficulty in filtering small-grained molecular sieves, etc., and achieve good filtration performance

Active Publication Date: 2020-07-31
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the reduction of SAPO-34 molecular sieve grains can improve its MTO performance, the molecular sieve with small grains has the problem of difficulty in filtration, which is a common problem caused by the reduction of molecular sieve particle size and tight packing.

Method used

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  • Synthetic method of easy-to-filter composite-morphology SAPO-34 molecular sieve
  • Synthetic method of easy-to-filter composite-morphology SAPO-34 molecular sieve
  • Synthetic method of easy-to-filter composite-morphology SAPO-34 molecular sieve

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Embodiment 1

[0030] A kind of synthetic method of easily filtering composite morphology SAPO-34 molecular sieve:

[0031] (1) Composition of raw materials: Aluminum source (based on Al 2 o 3 In terms of), phosphorus source (in P 2 o 5 In terms of), additives, silicon source (in terms of SiO 2 The molar ratio of water, template agent 1 and template agent 2 is 1:1:0.1:0.3:50:1:2.

[0032] (2) Specific steps include: take a certain amount of water and pseudo-boehmite, add them to a beaker, and stir evenly; weigh phosphoric acid and tetraethylammonium hydroxide, add them to a beaker, stir evenly, then add them to the above liquid, and stir evenly ; Then add tetraethylenepentamine, silica sol and triethylamine in sequence, and stir evenly; put the reaction solution into a high-pressure reactor, and conduct hydrothermal crystallization at 190°C for 24 hours; after the reaction is completed, steam the organic amine, and the crystallization solution Use a membrane test filter press to filter ...

Embodiment 2

[0035] A kind of synthetic method of easily filtering composite morphology SAPO-34 molecular sieve:

[0036] (1) Raw material composition: aluminum source (as Al 2 o 3 In terms of), phosphorus source (in P 2 o 5 In terms of), additives, silicon source (in terms of SiO 2 The molar ratio of water, template agent 1 and template agent 2 is 1:1:0.1:0.3:60:1:2.

[0037] (2) The specific steps include: take a certain amount of water and pseudo-boehmite and add them to the beaker, and stir evenly; weigh phosphoric acid and tetraethylammonium bromide, add them to the beaker, stir evenly, then add them to the above liquid, and stir evenly ; Then add tetraethylenepentamine, silica sol and triethylamine in sequence, and stir evenly; put the reaction solution into a high-pressure reactor, and conduct hydrothermal crystallization at 200°C for 24 hours; after the reaction is completed, steam the organic amine, and the crystallization solution Use a membrane test filter press to filter a...

Embodiment 3

[0040] A kind of synthetic method of easily filtering composite morphology SAPO-34 molecular sieve:

[0041] (1) Raw material composition: aluminum source (as Al 2 o 3 In terms of), phosphorus source (in P 2 o 5 In terms of), additives, silicon source (in terms of SiO 2 The molar ratio of water, template agent 1 and template agent 2 is 1:1:0.1:0.3:60:1:2.

[0042] (2) The specific steps include: take a certain amount of water and pseudo-boehmite and add them to the beaker, and stir evenly; weigh phosphoric acid and tetraethylammonium chloride, add them to the beaker, stir evenly, then add them to the above liquid, and stir evenly ; Then add tetraethylenepentamine, silica sol and diethylamine in sequence, and stir evenly; put the reaction solution into a high-pressure reactor, and conduct hydrothermal crystallization at 200°C for 24 hours; after the reaction is completed, steam the organic amine, and the crystallization solution Filter and wash with a diaphragm experimenta...

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Abstract

The invention discloses a synthetic method of easy-to-filter composite-morphology SAPO-34 molecular sieve. The method comprises: mixing an aluminum source and water, and uniformly stirring to obtain amixture 1; mixing a phosphorus source and a template agent 1, and uniformly stirring to obtain a mixture 2; adding the mixture 2 into the mixture 1, and uniformly stirring; sequentially adding an auxiliary agent, a silicon source and a template agent 2, and uniformly stirring; putting an obtained mixed product into a reaction kettle, and carrying out hydrothermal crystallization; and filtering, washing, drying and roasting a reaction product to obtain the SAPO-34 molecular sieve with the composite morphology. According to the invention, the SAPO-34 molecular sieve with composite morphology isprepared by controlling the use of the auxiliary agent and the synthesis steps, and has better filterability compared with a molecular sieve with a single morphology.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, and in particular relates to a method for synthesizing a SAPO-34 molecular sieve with an easy-to-filter compound morphology. Background technique [0002] In 1984, the SAPO-34 molecular sieve developed by the UCC company in the United States is a kind of small-pore molecular sieve with excellent performance. Propylene pathway. Conventional SAPO-34 molecular sieve has large grain size, low catalytic activity and short life in MTO reaction. Reducing the grain size can reduce the effect of diffusion limitation and increase the utilization of acid sites, thus improving the catalytic activity and prolonging the service life. [0003] Patent CN200710060297 discloses a method for preparing small-grained SAPO-34 molecular sieves. The method adopts ultrasonic aging treatment to synthesize gels, and triethylamine is used as a template to synthesize small grains of about 1 micron; patent CN201010...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54
CPCC01B37/08C01B39/54C01P2004/20C01P2004/22C01P2004/38
Inventor 程鸿魁周彤郝伟李元东姜叶葳王闯袁龙
Owner CHIA TAI ENERGY MATERIALS DALIAN