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Method for quick in situ crystallization synthesis of faujasite

A faujasite and chemical synthesis technology, which is applied in the directions of faujasite crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of long in-situ crystallization time and complicated preparation, and achieve the effect of shortening the synthesis time.

Active Publication Date: 2010-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although CN1549746A, CN1232862A, and CN1334318A all involve the use of calcined kaolin as the substrate for in-situ synthesis to prepare Y molecular sieves, they all show that the preparation is cumbersome if a large number of Y crystal seeds need to be added, and the in-situ crystallization times disclosed in these patents are relatively Long, usually more than 20h or even 30h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] It is the in-situ crystallization faujasite product of the present invention. Firstly, raw kaolin powder with a particle size of 200 mesh produced in Anhui was roasted in a muffle furnace at 550°C for 2 hours to obtain low-temperature metakaolin. Then take a 5-liter beaker, add 295.6g of aluminum sulfate and add 600g of water to dissolve it, and take 56.3g of solid sodium hydroxide and add 171g of water to dissolve it, slowly add the former to the latter under stirring, then add 225g of the above-mentioned roasted kaolin, and then add the silicon oxide content 992g of 28% water glass, stirred continuously for 1h, left to age for 4h, then added 50g of Y-directing agent, stirred evenly, transferred the above mixture into a reaction kettle and crystallized under hydrothermal conditions at 110°C for 14h, filtered and washed to obtain in-situ crystal chemical products. It is a typical Y molecular sieve determined by XRD light, with a crystallinity of 39% and a specific surf...

Embodiment 2

[0020] It is the in-situ crystallization faujasite product of the present invention. Firstly, the natural raw kaolin powder produced in Shandong with a particle size of 900 mesh was roasted at 950°C for 2 hours in a muffle furnace to obtain high-temperature metakaolin. Then take a 5-liter beaker, add 45.9g of solid sodium hydroxide and 273.7g of water and stir to dissolve, slowly add 212.5g of 12% aluminum chloride solution, stir evenly, add 152g of the above-mentioned roasted kaolin, and then add water with a silicon oxide content of 28% The glass was 536g, stirred continuously for 1h, left to age for 8h, then added 30g of Y-directing agent, stirred evenly, transferred the above mixture into a reaction kettle and crystallized under hydrothermal conditions at 97°C for 18h, filtered and washed with water to obtain the in-situ crystallized product. It is a typical Y molecular sieve determined by XRD light, with a crystallinity of 42% and a specific surface area of ​​493m 2 / g, ...

Embodiment 3

[0022] It is the product of in-situ crystallization of octane zeolite in the present invention. Firstly, raw coal kaolin powder with a particle size of 600 mesh produced in Inner Mongolia was roasted at 1350°C for 2 hours in a muffle furnace to transform into mullite. Then take a 5-liter beaker, add 60.9g solid sodium hydroxide and 124.8g sodium aluminate and add water 114.5, stir until dissolved, add the above-mentioned mullite 135g, then add 520g of water glass with a silicon oxide content of 32%, and continue stirring for 1h After standing and aging for 2 hours, 15 g of Y-directing agent was added, and after stirring evenly, the above mixture was transferred to a reactor and crystallized under hydrothermal conditions at 105°C for 11 hours, filtered and washed with water to obtain an in-situ crystallized product. It is a typical Y molecular sieve determined by XRD light, with a crystallinity of 33% and a specific surface area of ​​288m 2 / g, the pore volume is 0.236ml / g, an...

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Abstract

The invention relates to a method for quick in situ crystallization synthesis of faujasite, which comprises the following steps: (1) dissolving alkali sodium salt, aluminum containing compounds and water glass in water or evenly mixing alkali sodium salt, aluminum containing compounds and the water glass with the water; (2) adding kaolin into the mixing solution for pulping; (3) ageing the mixing pulp while stirring the mixing pulp; (5) adding a guide agent metering a Y molecular sieve; (6) transferring the mixture to a reaction kettle for crystallization for less than 20 hours; and (7) filtering and water-washing the crystallization product to obtain the in situ crystallization product. By using the method, the in situ crystallization synthesis of the faujasite is realized in a mode of adding an aluminum source, so that the crystallizing time is greatly shortened, the product properties are improved, and the synthesized faujasite can be used as a component of hydrogenation cracking catalysts and the like.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of faujasite, in particular to a method for rapid in-situ crystallization of kaolin as a raw material to synthesize faujasite. technical background [0002] Zeolite molecular sieves widely exist in nature, and the realization of artificial synthesis of molecular sieves has promoted the development of material chemistry and industrial catalytic technology. Molecular sieves are not only widely used in catalysis, adsorption, separation and other processes, but also in micro lasers, gas and liquid separation membranes, gas sensors, nonlinear optical materials, fluorescent materials, low dielectric constant materials and anti-corrosion materials. Potential application prospects. At present, there are no less than a thousand kinds of artificially synthesized molecular sieves, and only about dozens of them have been applied in industry or aroused interest in the industrial field. The obstacles affecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/20C01B39/24
Inventor 陈松刘利军方向晨张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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