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Method for preparing 3A type zeolite molecular sieve

A technology of zeolite molecular sieve and molecular sieve, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of long production cycle and high calcination temperature, and achieve high production efficiency, low calcination temperature and environmental pollution small effect

Inactive Publication Date: 2012-02-15
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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Problems solved by technology

[0018] The above Chinese patents respectively propose different methods to prepare A-type molecular sieves with kaolin as raw material, but there are still some problems: (1) the calcination temperature for preparing metakaolin is relatively high (700-1000° C. is generally required); (2) calcined kaolin and crystal Whitening agent needs to be added in the chemicalization process; the silicon-aluminum ratio needs to be adjusted; (4) The production cycle is long

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  • Method for preparing 3A type zeolite molecular sieve
  • Method for preparing 3A type zeolite molecular sieve
  • Method for preparing 3A type zeolite molecular sieve

Examples

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Embodiment 1

[0041] A method for preparing 3A type zeolite molecular sieve, it comprises the steps:

[0042] 1), the calcining of kaolin: be raw material (see figure 1 , figure 2 ), calcined at 550°C for 4 hours to obtain metakaolin. The soft kaolin in Lincang, Yunnan is the soft kaolin obtained from Lincang, Yunnan, and the Al 2 o 3 The mass percentage content is 37.7%, Fe 2 o 3 The mass percentage content is 0.19%, TiO 2 The mass percent content of is 0.13%, whiteness=86, average particle diameter=10 microns.

[0043] 2), Preparation of 4A molecular sieve: Weigh 20g of metakaolin, measure 100ml of 4mol / L NaOH aqueous solution, mix evenly, stir vigorously in a water bath at 80°C for 5h (greater than 600 rpm), and then heat up to 100°C at a medium speed Stir for 4 hours (300-600 rpm) to obtain a mixture; filter the mixture, wash the filter cake with distilled water and filter again, and dry the filter cake at 100°C for 2 hours to obtain 4A molecular sieve. The X-ray powder crystal...

Embodiment 2

[0047] A method for preparing 3A type zeolite molecular sieve, it comprises the steps:

[0048] 1) Calcination of kaolin: take soft kaolin from Lincang, Yunnan as raw material, and calcinate at 700° C. for 3 hours to obtain metakaolin. The soft kaolin in Lincang, Yunnan is the soft kaolin obtained from Lincang, Yunnan, and the Al 2 o 3 The mass percentage content is 37.7%, Fe 2 o 3 The mass percentage content is 0.19%, TiO 2 The mass percent content of is 0.13%, whiteness=86, average particle diameter=10 microns.

[0049] 2), Preparation of 4A molecular sieve: Weigh 15g of metakaolin, measure 100ml of 2mol / L NaOH aqueous solution, mix evenly, stir vigorously in a water bath at 70°C for 3h (greater than 600 rpm), and then heat up to 90°C at a medium speed Stir for 6 hours (300-600 rpm) to obtain a mixture; filter the mixture, wash the filter cake with distilled water and filter again, and dry the filter cake at 90°C for 4 hours to obtain 4A molecular sieve.

[0050] 3), t...

Embodiment 3

[0053] A method for preparing 3A type zeolite molecular sieve, it comprises the steps:

[0054] 1) Calcination of kaolin: take soft kaolin from Lincang, Yunnan as raw material, and calcinate at 650° C. for 3 hours to obtain metakaolin. The soft kaolin in Lincang, Yunnan is the soft kaolin obtained from Lincang, Yunnan, and the Al 2 o 3 The mass percentage content is 37.7%, Fe 2 o 3 The mass percentage content is 0.19%, TiO 2 The mass percent content of is 0.13%, whiteness=86, average particle diameter=10 microns.

[0055] 2), Preparation of 4A molecular sieve: Weigh 25g of metakaolin, measure 100ml of 3mol / L NaOH aqueous solution, mix evenly, stir vigorously in a water bath at 75°C for 4h (greater than 600 rpm), and then heat up to 95°C at a medium speed Stir for 4 hours (300-600 rpm) to obtain a mixture; filter the mixture, wash the filter cake with distilled water and filter again, and dry the filter cake at 90° C. for 4 hours to obtain 4A molecular sieve.

[0056] 3) ...

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Abstract

Belonging to the field of molecular sieve synthesis, the invention relates to a method for preparing a 3A type zeolite molecular sieve. The preparation method of a 3A type zeolite molecular sieve is characterized by comprising the steps of: 1) calcination of kaolin, thus obtaining metakaolin; 2) preparation of a 4A molecular sieve: mixing metakaolin and a NaOH aqueous solution uniformly, thus obtaining a mixture; filtering the mixture, washing the filter cake with distilled water, and conducting filtration again, drying the filter cake from second filtration at a temperature of 90-100DEG C for 2-4h, thus obtaining the 4A molecular sieve; 3) preparation of a 3A type zeolite molecular sieve: reacting the 4A molecular sieve with a KCl solution in a reaction vessel for 3-5h at a temperature of 70-90DEG C, then conducting cooling, washing, and filtering, drying the obtained filter cake at a temperature of 90-100DEG C for 2-4h, thus obtaining the 3A type zeolite molecular sieve. The method of the invention has simple process and low calcination temperature, and the prepared 3A type zeolite molecular sieve has great calcium ion exchange capacity and good performances.

Description

technical field [0001] The invention relates to a method for preparing 3A type zeolite molecular sieve, which belongs to the field of molecular sieve synthesis. Background technique [0002] Molecular sieve is a crystalline aluminosilicate with a uniform pore structure, and its spatial network structure is composed of silicon-oxygen tetrahedral units [SiO 4 ] and alumina tetrahedral units [AlO 4 ] are arranged in a staggered manner. The molecular sieve structure contains a large amount of crystal water. During the heating process, due to the loss of crystal water, many cavities of different sizes are formed, and many micropores with the same diameter are connected between the cavities, forming a uniform diameter of molecular size. tunnel. Therefore, molecules with a diameter larger than the pores can be excluded, thereby realizing the function of sieving molecules, and molecular sieves get their name from this. This structural feature makes molecular sieves have three ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/18
Inventor 王永钱严春杰孙奇舒国晶梁玉军周春宇肖国祺袁六四夏云山
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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