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Method for preparing ZSM-5 zeolite by in situ crystallization

An in-situ crystallization, ZSM-5 technology, applied in chemical instruments and methods, crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of small micropore area and micropore volume. , the method is complicated, the content of ZSM-5 zeolite is low, etc., to achieve the effect of rich mesopores, increase the volume of micropores, and high zeolite content

Active Publication Date: 2009-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing ZSM-5 zeolite by this method is relatively complicated, and the crystallization time is as long as 72 hours, and the content of ZSM-5 zeolite in the crystallized microspheres is low, and the micropore area and micropore volume are small

Method used

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  • Method for preparing ZSM-5 zeolite by in situ crystallization
  • Method for preparing ZSM-5 zeolite by in situ crystallization
  • Method for preparing ZSM-5 zeolite by in situ crystallization

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1. Preparation of kaolin microspheres

[0040] Add kaolin, silica sol and water into a gel tank and mix homogeneously to obtain a kaolin slurry with a solid content of 30% by weight. The kaolin slurry is spray-dried to obtain kaolin microspheres with an average particle diameter of 50 μm. The kaolin microspheres were washed twice with decationized water of pH=2-4 at a mass ratio of 10:1 to the kaolin microspheres. The properties of raw materials are shown in Table 1, and the composition content of each component in the slurry is calculated on a dry basis in Table 2.

[0041] Table 1

[0042]

[0043] Table 2

[0044]

[0045] 2. Preparation of silica-rich clay microspheres

[0046] The silicon-rich clay is diatomaceous earth. In addition, diatomite, silica sol and water were added to another gel-forming tank and mixed homogeneously to obtain a silicon-rich clay slurry with a solid content of 60% by weight. The silicon-rich clay slurry was spray-dried to obtain...

Embodiment 2

[0054] 1. Preparation of kaolin microspheres

[0055] Add kaolin, ZSM-5 zeolite seed crystals, silica sol and water into a glue tank and mix homogeneously to obtain a kaolin slurry with a solid content of 40% by weight. The kaolin slurry is spray-dried to obtain kaolin microspheres with an average particle diameter of 60 μm. The kaolin microspheres were washed twice with decationized water of pH=2-4 at a mass ratio of 10:1 to the kaolin microspheres. The properties of raw materials are shown in Table 1, and the composition content of each component in the slurry is calculated on a dry basis in Table 2.

[0056] 2. Preparation of silica-rich clay microspheres

[0057] The silicon-rich clay uses diatomaceous earth and pyrophyllite. In addition, diatomite, pyrophyllite, silica sol and water were added into another gel-forming tank and mixed homogeneously to obtain a silicon-rich clay slurry with a solid content of 50% by weight. The silicon-rich clay slurry was spray-dried to o...

Embodiment 3

[0065] 1. Preparation of kaolin microspheres

[0066] Add kaolin, Y-type zeolite seed crystals, silica sol and water into a gel tank and mix homogeneously to obtain a kaolin slurry with a solid content of 30% by weight. The kaolin slurry is spray-dried to obtain kaolin microspheres with an average particle diameter of 80 μm. The kaolin microspheres were washed twice with decationized water of pH=2-4 at a mass ratio of 10:1 to the kaolin microspheres. The properties of raw materials are shown in Table 1, and the composition content of each component in the slurry is calculated on a dry basis in Table 2.

[0067] 2. Preparation of silica-rich clay microspheres

[0068] The silicon-rich clay is bentonite. Add bentonite, water glass and water to another gel-forming tank and mix homogeneously to obtain a silicon-rich clay slurry with a solid content of 30% by weight. Spray-dry the silicon-rich clay slurry to obtain a silicon-rich clay microparticle with an average particle diameter...

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Abstract

The invention relates to a method for preparing ZSM-5 zeolite through in-situ crystallization, which comprises that: kaolin slurry containing kaolin, adhesive and water is prepared into kaolin microspheres through spray drying, and the prepared kaolin microspheres are baked; silicon-enriched clay slurry containing silicon-enriched clay, adhesive and water is prepared into silicon-enriched clay microspheres through spray drying, and the prepared silicon-enriched clay microspheres are baked; and the respectively baked kaolin microspheres and silicon-enriched clay microspheres are mixed with a water solution containing alkali, and the mixture is subjected to in-situ hydrothermal crystallization to obtain crystallization product, wherein the mol ratio of SiO2 to Al2O3 in the silicon-enriched clay is more than 2. The ZSM-5 zeolite prepared by the method has high content of zeolite and rich middle holes, so the ZSM-5 zeolite can be used as a catalyst in the field of petrochemical industry.

Description

technical field [0001] The invention relates to a method for preparing ZSM-5 zeolite by in-situ crystallization. Background technique [0002] Since ZSM-5 zeolite was first reported by the Mobil Company of the United States (USP3702886) in 1972, due to the unique three-dimensional pore structure and shape-selective catalysis of ZSM-5 zeolite, it has high silicon-aluminum ratio and lipophilic and hydrophobic characteristics. Characterized by high stability and high catalytic activity, it is widely used as a catalyst in various methods. [0003] ZSM-5 zeolites have been shown to be particularly useful catalysts in reactions involving aromatic compounds, especially aromatic compounds having a single carbocyclic ring. Therefore, in the conversion reaction of olefins, naphthalene, alcohols, ethers and alkanes to aromatic compounds and in reactions such as isomerization, alkylation, dealkylation and transalkylation of aromatic compounds, ZSM-5 zeolite All exhibit unique selectiv...

Claims

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Application Information

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IPC IPC(8): C01B39/38C01B39/40B01J29/40
Inventor 潘晖华罗一斌王殿中慕旭宏蒋文斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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