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Preparation method for 5N high-purity aluminum nitrate

An aluminum nitrate, high-purity technology, applied in directions such as aluminum nitrate, can solve problems such as time-consuming, slow reaction, mercury pollution discharge, etc., and achieve the effects of avoiding mercury pollution, short production cycle, and good economic benefits

Inactive Publication Date: 2017-08-29
天津市风船化学试剂科技有限公司
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Problems solved by technology

Due to the slow reaction between metal aluminum and nitric acid, metal mercury or mercury compounds are usually added as a catalyst to increase the reaction speed, and there will be mercury and other impurities in the aluminum nitrate produced in this way. To obtain a 5N high-purity aluminum nitrate product with a purity of 99.999%, It requires repeated recrystallization and purification, which is time-consuming and laborious, and also produces mercury pollution emissions; the yield of the final product is very low and uneconomical
[0003] Another process is to prepare aluminum nitrate by reacting aluminum hydroxide with nitric acid. The problem with this method is that the purity of aluminum hydroxide cannot be guaranteed, and 5N high-purity aluminum nitrate cannot be directly prepared.

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  • Preparation method for 5N high-purity aluminum nitrate

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[0023] A kind of preparation method of 5N high-purity aluminum nitrate (99.999%), its step is:

[0024] ⑴Metal aluminum pretreatment: clean the high-purity aluminum sheet with a thickness of about 0.2 mm with acetone, then rinse with pure water, then soak in high-purity 10% nitric acid at room temperature for 15 minutes, and then rinse with pure water for later use;

[0025] (2) Decomposition: Put the pretreated high-purity metal aluminum flakes into a 5000 ml three-neck glass flask, add 2500 ml of high-purity nitric acid with a concentration of 30% to 35% (weight percentage), install a reflux condenser, and pass it into Cooling water, the flask is heated to reflux with a temperature-adjusting electric heating mantle, and the temperature of the reaction solution is maintained at 100-120°C until no brownish-yellow gas is produced. Next, use a G4 glass filter to suction filter, and the filtrate is transferred to a 5000 ml glass beaker for subsequent use;

[0026] (3) Concentrat...

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Abstract

The invention relates to a preparation method for 5N high-purity aluminum nitrate. The preparation method comprises the following steps: (1) pretreatment of metallic aluminum; (2) decomposition; (3) concentration; (4) crystallization; and (5) separation and crystallization. The preparation method for 5N high-purity aluminum nitrate (99.999%) prepares high-purity aluminum nitrate from a 5N high-purity metallic aluminum sheet and high-purity nitric acid with a concentration of 30 to 35% through a reflux and heating reaction; mercury and mercury compound catalysts are not added in the process of the reaction, so mercury pollution is avoided; and high-purity aluminum nitrate is directly prepared and the process of repeated recrystallization and purification of aluminum nitrate is avoided.

Description

technical field [0001] The invention belongs to the field of chemical reagents, in particular to a preparation method of 5N high-purity aluminum nitrate. Background technique [0002] High-purity aluminum nitrate is generally prepared by the following process: it is obtained by reacting metal aluminum plate with nitric acid. Due to the slow reaction between metal aluminum and nitric acid, metal mercury or mercury compounds are usually added as a catalyst to increase the reaction speed, and there will be mercury and other impurities in the aluminum nitrate produced in this way. To obtain a 5N high-purity aluminum nitrate product with a purity of 99.999%, Repeated recrystallization and purification are required, which is time-consuming and labor-intensive, and also produces mercury pollution emissions; the yield of the final product is very low and uneconomical. [0003] Another technique is to prepare aluminum nitrate by reacting aluminum hydroxide with nitric acid. The prob...

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Application Information

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IPC IPC(8): C01F7/66
CPCC01F7/66C01P2006/80
Inventor 郝承志孔祥风于明爱
Owner 天津市风船化学试剂科技有限公司
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