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Zeolite molecular sieve synthesis method

A technology of zeolite molecular sieve and synthesis method, which is applied in the direction of molecular sieve and alkali exchange compound, chemical equipment and method, crystalline aluminosilicate zeolite, etc., which can solve the problems of harsh synthesis conditions, many safety hazards, and increase synthesis cost, and achieve production High cost, avoiding the danger of high-pressure explosion, and saving production costs

Inactive Publication Date: 2019-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, expensive ionic liquids are required to participate in the reaction, and large-scale industrial application is very difficult.
[0014] At present, the synthesis of most zeolite molecular sieves is difficult, and the synthesis conditions are generally relatively harsh. Most of them are synthesized by high temperature and high pressure, and there are many safety hazards.
Although the ionic liquid synthesis method can synthesize zeolite under normal pressure, the use of ionic liquid will greatly increase the synthesis cost

Method used

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  • Zeolite molecular sieve synthesis method
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  • Zeolite molecular sieve synthesis method

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preparation example Construction

[0035] The invention provides a kind of synthetic method of zeolite, and described synthetic method comprises the following contents:

[0036] (1) Mix inorganic alkali, silicon source, aluminum source, and water, and get a gel after mixing evenly;

[0037] (2) Dry the gel obtained in step (1) at 80-160°C until the water evaporates completely;

[0038] (3) Put the mixture obtained in step (2) into the reactor, and pass water vapor into the reactor to carry out the crystallization reaction, the reaction temperature is 100-240°C, and the reaction time is 10-150h;

[0039] (4) Washing and drying the solid product obtained in step (3) to obtain zeolite.

[0040] In the method of the present invention, the inorganic base described in step (1) can be one or more of NaOH, KOH, LiOH; the silicon source can be one or more of white carbon black, silica gel, silica sol or water glass species; the aluminum source can be one or more of sodium aluminate, aluminum sulfate, aluminum chloride...

Embodiment 1

[0112] First, take 4 g of sodium hydroxide and 3.7 g of sodium aluminate in 50 mL of distilled water, and stir until they are completely dissolved. Add 3.5 g of white carbon black slowly and stir for 30 min. Put it into the reactor for crystallization at 110°C for 3h. Then dry at 100°C until the water evaporates completely. Then the resulting mixture is placed in the reactor (the inlet line of the reactor is connected to the water vapor source, and the outlet line is connected to the outside atmosphere). Under the conditions of crystallization for 20h. Finally, the solid product was washed to neutrality, and dried at 120°C for 12 hours. The obtained sample number was CL1, and the XRD spectrum of the obtained sample was as follows: figure 1 As shown, it is X zeolite with high crystallinity.

Embodiment 2

[0114] First, take 2 g of sodium hydroxide and 3 g of sodium aluminate in 30 mL of distilled water and stir until they are completely dissolved. Slowly add 2g of white carbon black and stir for 30 min. Put it into the reactor for crystallization at 80°C for 3.5h. Then dry at 100°C until the water evaporates completely. Then the resulting mixture is placed in the reactor (the inlet line of the reactor is connected to the water vapor source, and the outlet line is connected to the outside atmosphere). Under the conditions of crystallization for 10h. Finally, the solid product was washed to neutrality and dried at 120° C. for 12 hours. The obtained sample number was CL2, and the obtained sample was X zeolite with high crystallinity.

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Abstract

The invention discloses a zeolite molecular sieve synthesis method, and belongs to the field of molecular sieve synthesis. The synthesis method comprises: uniformly mixing an inorganic alkali, an aluminum source, a silicon source and water to obtain a gel, drying the gel until the water is completely evaporated, crystallizing, washing, and drying to obtain zeolite. According to the present invention, the synthesis method belongs to atmospheric pressure synthesis, and has low production cost, and the properties of the prepared zeolite molecular sieve can meet the needs of catalytic industry.

Description

technical field [0001] The invention relates to a method for synthesizing zeolite, which belongs to the field of synthesizing molecular sieve catalytic materials. Background technique [0002] Zeolite molecular sieves are important adsorption and catalytic materials in the chemical industry. Human beings discovered and recognized the unique properties and importance of natural zeolite in the nineteenth century. Subsequently, people tried to imitate the geological formation conditions of natural zeolites, and used high-temperature hydrothermal synthesis technology (temperature higher than 200 ° C and high pressure greater than 100 atmospheres) to synthesize artificial zeolites. In the 1850s, low-temperature hydrothermal synthesis technology was developed (reaction temperature 25-150°C, reaction pressure 1 to tens of atmospheres), and zeolites with low silicon-aluminum ratios such as A, X, L, Y, and mordenite were synthesized. Greatly reduced synthesis difficulty and product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04C01B39/22C01B39/24C01B39/40C01B39/42C01B39/26C01B39/48
Inventor 范峰凌凤香张会成王少军杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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