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Process for high concentration fast synthesis of ZSM-5 molecular sieve

A technology of ZSM-5 and zeolite molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as long crystallization time

Inactive Publication Date: 2006-12-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN02153377.6 requires 8-144 hours at a crystallization temperature of 120-220°C; CN85100463 also needs to be crystallized at 100-260°C for 4 hours-40 days by the direct synthesis method. long question

Method used

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  • Process for high concentration fast synthesis of ZSM-5 molecular sieve
  • Process for high concentration fast synthesis of ZSM-5 molecular sieve
  • Process for high concentration fast synthesis of ZSM-5 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 8.32g of aluminum sulfate to 15g of deionized water, stir to dissolve it to prepare A solution for later use. Dissolve 8g of sodium hydroxide into 10g of deionized water to obtain solution B, and after stirring evenly, slowly add solution B to solution A under stirring to obtain solution C. Slowly add solution C dropwise to 75g of silica sol under stirring, add 0.5g of finished ZSM-5 zeolite and 1.5g of 70% ethylamine aqueous solution after stirring for 30 minutes, continue stirring for 30 minutes, then put it into a kettle, and heat it at 180°C The crystallization was carried out for 0.5 hours. After the product is cooled down, it is filtered and washed with deionized water until the pH is about 8, and then dried to obtain ZSM-5 zeolite.

Embodiment 2

[0029] 8.32g of aluminum sulfate was added to 53g of deionized water, stirred to make it dissolve to prepare A solution for later use. Dissolve 7g of sodium hydroxide into 50g of deionized water to obtain solution B, and after stirring evenly, slowly add solution B to solution A under stirring to obtain solution C. Slowly add solution C dropwise to 75g of silica sol under stirring, add 0.5g of finished ZSM-5 zeolite and 1.5g of 70% ethylamine aqueous solution after stirring for 30 minutes, continue stirring for 30 minutes, then put it into a kettle, and heat it at 180°C The crystallization was carried out for 2 hours. After the product is cooled down, it is filtered and washed with deionized water until the pH is about 8, and then dried to obtain ZSM-5 zeolite.

Embodiment 3

[0031] 8.32g of aluminum sulfate was added to 53g of deionized water, stirred to make it dissolve to prepare A solution for later use. Dissolve 8g of sodium hydroxide into 50g of deionized water to obtain solution B, and after stirring evenly, slowly add solution B to solution A under stirring to obtain solution C. Slowly add solution C dropwise to 75g of silica sol under stirring, add 0.5g of finished ZSM-5 zeolite and 4.2g of ethylenediamine after stirring for 30 minutes, continue stirring for 30 minutes, then put it into a kettle, Crystallized for 6 hours. After the product is cooled down, it is filtered and washed with deionized water until the pH is about 8, and then dried to obtain ZSM-5 zeolite.

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Abstract

The invention discloses a high-density rapid synthesizing method of ZSM-5 zeolitic molecular sieve, which is characterized by the following: adopting water glass or silicasol as silicon source, and aluminum sulfate, aluminium chloride, aluminum nitrate as aluminum source and short-chain organic amine as mould agent; adding ZSM-5 as seed to crystallize according to normal water-heat synthesizing method. The invention shortens crystallizing time, which reduces manufacturing cost effectively.

Description

technical field [0001] The invention relates to a method for quickly synthesizing ZSM-5 zeolite molecular sieve with relatively high concentration. Background technique [0002] In the 1970s, the ZSM-5 zeolite molecular sieve invented by Mobil Petroleum Company of the United States has been widely used in petrochemical processes such as shape-selective cracking, alkylation, isomerization, disproportionation, etherification, and dewaxing of hydrocarbons. application. It is reported in USP3702886 that tetrapropylammonium hydroxide is used as template to synthesize ZSM-5 molecular sieve and crystallize at 100-175°C for 6 hours to 60 days. The USP5240892 patent does not use an organic template agent, and the synthesis cycle is relatively long, generally requiring more than 100 hours. Chinese patent CN02153377.6 requires 8-144 hours at a crystallization temperature of 120-220°C; CN85100463 also needs to be crystallized at 100-260°C for 4 hours-40 days by the direct synthesis me...

Claims

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Application Information

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IPC IPC(8): C01B39/38B01J29/40
Inventor 刘双喜贾爱忠
Owner NANKAI UNIV
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