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A kind of synthetic method of sapo-34 molecular sieve with composite morphology that is easy to filter

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

Active Publication Date: 2021-08-27
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of synthetic method of sapo-34 molecular sieve with composite morphology that is easy to filter
  • A kind of synthetic method of sapo-34 molecular sieve with composite morphology that is easy to filter
  • A kind of synthetic method of sapo-34 molecular sieve with composite morphology that is easy to filter

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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 method for synthesizing SAPO-34 molecular sieve with an easy-to-filter composite morphology, which comprises the following steps: mixing an aluminum source and water, and stirring them evenly; mixing a phosphorus source and a template agent 1, and stirring them evenly; mixing the obtained mixture Add into the aforementioned mixture, stir evenly; add auxiliary agent, silicon source and template agent 2 in turn, stir evenly; put the obtained mixture into the reaction kettle, and carry out hydrothermal crystallization; the reaction product is filtered, washed, dried and roasted. The composite morphology SAPO-34 molecular sieve was obtained. The invention prepares the SAPO-34 molecular sieve with composite morphology by controlling the use of auxiliary agents and the synthesis steps, and has better filterability compared with the molecular sieve with 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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Patent Type & Authority Patents(China)
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
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