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Amine-free rapid in-situ crystallization ZSM-5 molecular sieve synthesis method

A ZSM-5, chemical synthesis technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc. The effect of reaction time, reduction of production cost, and improvement of single-pot yield

Inactive Publication Date: 2013-11-13
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the above-mentioned documents, the in-situ crystallization of kaolin microspheres to synthesize ZSM-5 molecular sieves will cause corresponding environmental pollution when organic amine templates are used, and the general crystallization time is also longer; the crystallization time is shorter when organic amine templates are not used. long, which is not conducive to increasing the output of a single kettle and reducing costs

Method used

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  • Amine-free rapid in-situ crystallization ZSM-5 molecular sieve synthesis method
  • Amine-free rapid in-situ crystallization ZSM-5 molecular sieve synthesis method

Examples

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example 1

[0032] (1) Preparation of clay microspheres

[0033] 5000g kaolin, 500g water glass and water are made into a slurry with a mass concentration of 30%, and then spray-molded to make microspheres with an average particle diameter of 70 μm, and roasted at 980° C. for 2 hours to obtain roasted microspheres B1. The roasted microspheres Medium active SiO 2 Content is 19% by weight, active Al 2 o 3 The content is 2% by weight.

[0034] (2) Hydrothermal in-situ crystallization of calcined microspheres

[0035] Take 50g of calcined microspheres B1, 172.5g of water glass, 5g of HZSM-5 molecular sieve and 220g of deionized water and mix evenly, add sulfuric acid to adjust the pH=11.8, then move into the autoclave, stir and crystallize at 170°C for 8 hours, filter, wash and After drying, a crystallized product was obtained, and the relative crystallinity of the ZSM-5 molecular sieve was measured to be 40%.

example 2

[0037] Take 50g of calcined microspheres B1, 172.5g of water glass, 2g of HZSM-5 molecular sieve and 220g of deionized water and mix evenly, add sulfuric acid to adjust the pH=12.2, then move it into a high-pressure reactor, stir and crystallize at 190°C for 12 hours, filter, wash and After drying, a crystallized product was obtained, and the relative crystallinity of the ZSM-5 molecular sieve was measured to be 32%.

example 3

[0039] Take 75g of calcined microspheres B1, 184.9g of water glass, 5g of HZSM-5 molecular sieve and 270g of deionized water and mix evenly, add sulfuric acid to adjust the pH=11.3, then move it into an autoclave, stir and crystallize at 170°C for 10 hours, filter, wash and After drying, a crystallized product was obtained, and the relative crystallinity of the ZSM-5 molecular sieve was measured to be 36%.

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Abstract

The invention relates to an amine-free rapid in-situ crystallization ZSM-5 molecular sieve synthesis method. According to the invention, roasted clay microspheres, a silicon source substance, a sodium source substance or acid, a solid crystal seed, and water are mixed into a crystallization reaction system; besides the solid crystal seed, the molar ratios of the components of the ratio are that: Na2O / SiO2=0.1-0.3, SiO2 / Al2O3=70-150, and H2O / SiO2=15-50. A pH value is 9.5-12.5. The reaction system is subjected to hydrothermal in-situ crystallization, such that a crystallization product is obtained. According to the invention, an organic amine template agent is not adopted, such that corresponding environment pollution is avoided, crystallization reaction time can be shortened, single-kettle yield can be improved, and production cost can be reduced.

Description

technical field [0001] The invention relates to a method for synthesizing ZSM-5 molecular sieves, more specifically, relates to a method for synthesizing ZSM-5 molecular sieves by in-situ crystallization. Background technique [0002] Since the invention of ZSM-5 molecular sieve by Mobil in the 1970s, due to its unique structure and properties, ZSM-5 molecular sieve has been widely used in the alkylation, isomerization, dealkylation and transalkylation of aromatic compounds In recent years, it has been more widely used in petroleum catalytic cracking, hydrocracking, hydrofinishing and catalytic dewaxing processes, especially in the form of microspheres in the catalytic cracking process, which not only has the effect of increasing the production of propylene, but also has the effect of increasing gasoline The effect of improving the octane number and improving the quality of oil products has produced huge economic benefits. The synthesis method of ZSM-5 molecular sieve has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
Inventor 陆善祥支小斌陈辉吴婷孟丽娜王欢
Owner EAST CHINA UNIV OF SCI & TECH