Method for synthesizing ZSM-5 molecular sieve

A synthesis method, the technology of ZSM-5, applied in the directions of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of shortening the process flow, environmental pollution, etc. The effect of environmental pollution and low production cost

Inactive Publication Date: 2007-03-28
EAST CHINA NORMAL UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of synthetic method of ZSM-5 molecular sieve, this method need not pass through the operation that adopts inorganic ammonium salt to carry out ion exchange to NaZSM-5, has effectively solved the problem of environmental pollution, has shortened technological process simultaneously, has conducive to industrial production

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  • Method for synthesizing ZSM-5 molecular sieve

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Embodiment 1

[0026] In the first step, the SiO in the first silicon source 2 : the first organic base template agent: Al in the first aluminum source 2 o 3 :H 2 The mol ratio of O is 1: 0.1: 0.04: 20, the first silicon source is tetraethyl silicate, the first aluminum source is aluminum sulfate, and the first organic alkali template is tetrapropyl ammonium hydroxide; In the second step , SiO in the second silicon source 2 : the second organic base template agent: Al in the second aluminum source 2 o 3 :H 2 The molar ratio of O is 1:1:0.033:12, and the addition amount of the directing agent solution is SiO in the second silicon source 2 3% by weight, the second silicon source is silica gel, the second aluminum source is aluminum sulfate, and the second organic base template is hexamethyleneimine; in the third step, the temperature and time of hydrothermal crystallization are respectively 170 °C and 4 days.

[0027] The XRD spectrum of the ZSM-5 molecular sieve of this example is sho...

Embodiment 2

[0029] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0030] In the first step, the SiO in the first silicon source 2 : the first organic base template agent: Al in the first aluminum source 2 o 3 :H 2 The molar ratio of O is 1: 0.2: 0.1: 80; In the second step, the second organic base template is a mixture of hexamethyleneimine and piperidine, and the mol ratio of hexamethyleneimine and piperidine is 5:5.

[0031] The XRD spectrum of the ZSM-5 molecular sieve of this example is similar to that shown in FIG. 1 .

Embodiment 3

[0033] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0034] In the second step, the second organic base template is piperidine, and the addition amount of the directing agent solution is SiO in the second silicon source. 2 15% by weight.

[0035] The XRD spectrum of the ZSM-5 molecular sieve of this example is similar to that shown in FIG. 1 .

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Abstract

The invention is a ZSM-5 molecular sieve synthesizing method, belonging to inorganic chemical synthesis technical field. And it prepares the ZSM-5 molecular sieve by preparing guiding agent and reacting mixed solution, hydrothermal crystallization, and routine filtering, washing, drying and baking, where the guiding agent uses tetrapropyl ammonium bromide or tetrapropyl ammonium hydroxide as the first organic alkali template and the reacting mixed solution uses annular molecular amine- hexamethylene imine or piperidine or their mixture as the second organic alkali template; and it has advantages of omitting ion exchange procedure, short process, low producing cost, not discharging ammonium- and nitrogen- containing waste water, not polluting environment, etc.

Description

technical field [0001] The invention relates to a synthesis method of ZSM-5 molecular sieve, which belongs to the technical field of inorganic chemical synthesis. Background technique [0002] ZSM-5 molecular sieve was synthesized for the first time in 1972 by American Mobil Company (US3,702,886). Because of its special pore structure and catalytic performance, excellent thermal stability and hydrothermal stability, it has been valued by the petrochemical industry at home and abroad, and has been widely used in catalytic cracking, aromatization, alkylation, disproportionation, etc. industrial chemical process. Generally speaking, the methods for synthesizing ZSM-5 molecular sieves are divided into amine-based synthesis using organic bases as templates and amine-free synthesis without using organic bases as templates. However, in the above two synthetic systems, inorganic bases (such as sodium hydroxide) are used. The main functions are: one is as a min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
Inventor 刘月明张海娇吴鹏吴海虹何鸣元
Owner EAST CHINA NORMAL UNIV
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