Preparation method of beta-aluminum fluoride with high specific surface area

A high specific surface area, aluminum fluoride technology, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of inconvenient operation and control, complex preparation process, high corrosion of the device, etc., to achieve easy operation and control, high purity, The effect of less corrosiveness of the device

Inactive Publication Date: 2010-10-20
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a simple preparation method for the shortcomings of the existing preparation of aluminum fluoride with high specific surface area, such as complex preparation process, long preparation

Method used

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  • Preparation method of beta-aluminum fluoride with high specific surface area
  • Preparation method of beta-aluminum fluoride with high specific surface area

Examples

Experimental program
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Embodiment 1

[0025] 100g specific surface area is 350m 2 g -1 γ-alumina as raw material, sucrose as carbon source, 80ml of sucrose solution with a mass fraction of 25% was added to γ-alumina, soaked for 3 hours, and dried at 400°C under N 2 Calcining under the atmosphere for 3 hours, impregnating, drying and calcining the carbon-containing γ-alumina after the first carbon filling, obtained the carbon-containing γ-alumina after the second carbon filling. Put the charcoal-containing γ-alumina in a fixed bed reactor and feed N 2 The mixed gas of HF gas and HF gas is used for fluorination treatment, in which HF gas and N 2 The molar ratio is 4, the fluorination temperature is 300°C, and the fluorination time is 6h. The carbon-containing aluminum fluoride after the fluorination treatment is impregnated with 5% potassium nitrate by equal volume, dried, put into a high-temperature furnace, and calcined at 425° C. for 6 hours in an oxygen atmosphere. The obtained substance was heat-treated wit...

Embodiment 2

[0028] The preparation method of the sample of the present invention is basically the same as Example 1, the difference is that the specific surface area is 302m 2 g -1 γ-alumina as raw material.

[0029] The product made in this embodiment is found to be β-aluminum fluoride substance by X-ray diffraction pattern, and the specific surface area measured by BET low-temperature nitrogen adsorption is 94m 2 g -1 .

Embodiment 3

[0031] The preparation method of the sample of the present invention is basically the same as Example 1, the difference is that the specific surface area is 251m 2 g -1 γ-alumina as raw material.

[0032] The product that this embodiment makes is found to be β-aluminum fluoride substance by X-ray diffractogram, and the specific surface area measured by BET low-temperature nitrogen adsorption is 84m 2 g -1 .

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Abstract

The invention relates to a preparation method of beta-aluminum fluoride with high specific surface area. Against for the defects of the prior art for preparing the aluminum fluoride with high specific surface area that the preparation process is complicated, the preparation period is long, the operation and the control are difficult, and the corrosion on the device is large, the invention provides a preparation method of beta-aluminum fluoride with high specific surface area with simple preparation process, short preparation period, easy operation and control and small corrosion on the device. The invention adopts the technical scheme that: gamma-alumina, carbon source and HF gas are adopted as raw materials, water solution of carbon source is soaked into the gamma-alumina in an equivalent soaking method, the gamma-alumina after being soaked with the carbon source is dried and carbonized to obtain gamma-alumina containing carbon, then the gamma-alumina containing the carbon is reacted with HF gas to obtain the aluminum fluoride containing carbon, and finally the aluminum fluoride containing the carbon is decarbonized, acidified, washed, dried and roasted to obtain the beta-aluminum fluoride with high specific surface area.

Description

technical field [0001] The invention relates to a method for producing aluminum fluoride, in particular to a method for preparing beta-aluminum fluoride with a high specific surface area. Background technique [0002] Aluminum fluoride is industrially used as a flux for aluminum smelting, as an inhibitor of secondary fermentation in alcohol production, as a flux and catalyst for non-ferrous metals. The crystal structure of aluminum fluoride has various crystal forms such as α, β, γ, η, θ, and κ. Among the many phases of aluminum fluoride, β-aluminum fluoride with high specific surface area has stronger Lewis acidity and catalytic activity. β-aluminum fluoride is used as a catalyst or its carrier for Lewis acid-catalyzed reactions such as heterogeneous halogen exchange, alkylation, Friedel-Crafts acylation, and benzene ring electrophile. At present, it has a very important application in the gas-solid phase catalytic synthesis of chlorofluorocarbons and their ODS substitute...

Claims

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Application Information

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IPC IPC(8): C01F7/50
Inventor 罗孟飞贾文志王月娟谢冠群
Owner ZHEJIANG NORMAL UNIVERSITY
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