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Method for synthesizing ZSM-35 molecular sieve

A technology of ZSM-35 and synthesis method, which is applied to iron-conglomerate crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of polluting the environment, reducing synthesis cost, and high ratio, and achieves green and environmental protection in the preparation process , Reduce production costs, and the effect of cheap and easy-to-get raw materials

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the crystallinity of the product is lower than that of the ZSM-35 molecular sieve synthesized by using an organic template, and the consumption of ZSM-35 and RUB-37 molecular sieves as crystal seeds is relatively large, which is not conducive to reducing the synthesis cost.
As we all know, the proportion of organic template agent in the preparation cost of zeolite molecular sieve is the highest, and the use of template agent also increases the operation steps of removing organic matter from molecular sieve, which not only increases the cost, but also pollutes the environment
And operators will cause great harm to their health when they come into contact with organic templates

Method used

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  • Method for synthesizing ZSM-35 molecular sieve
  • Method for synthesizing ZSM-35 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 40g of ZSM-35 molecular sieve and 1000mL of 1mol / L sodium hydroxide solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 4h. The resulting suspension is the structure-directing agent and is ready for use.

[0029] Take 12 g of sodium hydroxide and 5.3 g of sodium aluminate in 500 mL of distilled water, and stir vigorously until they are completely dissolved. Add 47 g of white carbon black slowly and stir vigorously for 30 min. Then add 30mL of the structure directing agent prepared in the previous step and stir vigorously for 30 min. Then put it into a closed reactor and crystallize in an oven at 150°C for 4 days. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 12 hours. The obtained sample number was CL1, and the obtained sample was as follows: figure 1 As shown, it is pure ZSM-35 molecular sieve without other impurities.

Embodiment 2

[0031]Take 30g of ZSM-35 molecular sieve and 1000mL of 1.1mol / L sodium hydroxide solution in a beaker, stir at room temperature for 20min, transfer to a closed reaction kettle, and treat in an oven at 130°C for 4h. The resulting suspension is the structure-directing agent and is ready for use.

[0032] Take 15 g of sodium hydroxide and 6.5 g of sodium aluminate in 600 mL of distilled water, and stir vigorously until they are completely dissolved. Add 50 g of white carbon black slowly and stir vigorously for 20 min. Then add 20mL of the structure-directing agent prepared in the previous step, and stir vigorously for 25 min. Then put it into a closed reactor and crystallize in an oven at 155°C for 2.5 days. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 12 hours. The obtained sample number was CL2, which was pure ZSM-35 molecular sieve.

Embodiment 3

[0034] Take 50g of ZSM-35 molecular sieve and 800mL of 1.5mol / L sodium hydroxide solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 130°C for 2.5h. The resulting suspension is the structure-directing agent and is ready for use.

[0035] Take 11.6 g of sodium hydroxide and 4.3 g of sodium aluminate in 450 mL of distilled water, and stir vigorously until they are completely dissolved. Add 38 g of white carbon black slowly and stir vigorously for 30 min. Then add 35mL of the structure directing agent prepared in the previous step and stir vigorously for 30 min. Then put it into a closed reactor and crystallize in an oven at 140°C for 5 days. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 12 hours. The obtained sample number was CL3, which was pure ZSM-35 molecular sieve.

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Abstract

The invention discloses a method for synthesizing a ZSM-35 molecular sieve. The method comprises the steps of firstly processing the ZSM-35 molecular sieve with an alkaline solution to prepare a structure-directing agent, stirring inorganic alkali, aluminium sources, silicon sources and water to synthesize silicon-aluminium gel, then adding the structure-directing agent and obtaining the ZSM-35 molecular sieve after hydrothermal crystallization. The method has the advantages that the ZSM-35 molecular sieve synthesized by the method has a high degree of crystallinity and effectively avoids mixed crystals; and the method is simple and easy to operate, is low and available in raw materials and avoids using toxic and harmful organic template agents.

Description

technical field [0001] The invention relates to a method for synthesizing ZSM-35 molecular sieves, in particular to a green and low-cost method for synthesizing ZSM-35 molecular sieves, and belongs to the field of synthesis of molecular sieve catalytic materials. Background technique [0002] ZSM-35 molecular sieve is a medium-pore zeolite with FER (Ferrierite) topology. It has a vertical intersecting two-dimensional channel system, in which the size of the ten-membered ring channel parallel to the [001] plane is 0.54 nm×0.42 nm, and the size of the eight-membered ring channel parallel to the [010] plane is 0.48 nm×0.35 nm. . ZSM-35 molecular sieve is widely used in the conversion process of hydrocarbons, and has good application prospects in reactions such as isomerization, polymerization, aromatization and cracking. [0003] At present, the synthesis of ZSM-35 molecular sieve mainly relies on organic matter as a template. CN101468809A discloses a method for synthesizing...

Claims

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Application Information

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IPC IPC(8): C01B39/44
Inventor 范峰凌凤香王少军张会成陈晓刚杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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