Improved process for preparing alpha-aluminum hydride

Abstract

The invention discloses an improved process for preparing alpha-aluminum hydride. The improved process comprises the following steps: (1) refining absolute ether; (2) refining methylbenzene; (3) refining lithium aluminum hydride; (4) preparing a mixed solution of anhydrous AlCl3 and diethyl ether; (5) preparing a mixed solution of LiAlH4 and anhydrous AlCl3; and (6) preparing the alpha-aluminum hydride. The invention provides the improved process for preparing the alpha-aluminum hydride, graphene is used to activate a reaction solution in the process, the production is safe and reliable, the yield is high, the purity of the obtained alpha-aluminum hydride is high, and the distribution of the particle size of a product is even. A preparation method is low in reaction temperature, shorter in reaction time, low in energy consumption, low in equipment requirement, simple in operations and easy in control of the reaction conditions, and is favorable for industrial production. According to the alpha-aluminum hydride prepared with the method, the product purity is more than or equal to 99%, the particle size range is 5-20 microns, the direct cost is less than or equal to 4000 yuan per kilogram.

Description

technical field [0001] The invention relates to an improved process for preparing α-aluminum hydride, and specifically belongs to the interdisciplinary field of inorganic material preparation and energetic material technology. Background technique [0002] From the point of view of the effect of increasing energy, adding high-energy additives to explosives can increase energy much more than other methods. At present, the most widely used method is to add metal Al powder with high calorific value to explosives. As we all know, weapons seek to increase the high energy of explosives, so AlH 3 , B, BeH 2 The addition of high-energy substances instead of aluminum powder has gradually attracted the attention of researchers and put a lot of energy into research. Since AlH 3 Due to its high hydrogen content, high heat of combustion, and non-toxic properties, it can be used in the field of high-energy fuels. Thermochemical calculations show that with AlH 3 Replacing aluminum ca...

AI Technical Summary

Problems solved by technology

But AlH 3 There are also many problems in practical application: AlH 3 The preparation is more complicated and the cost is higher; there is still instability in hydrogen desorption performance at low temperature; due to AlH 3 It is a substance composed of two strongly reducing atoms, even the most stable α-AlH 3 , there are still phenomena such as slow degassing and decomposition, which cannot meet the requirements of practical applications

[0003] The traditional synthesis method converts lithium aluminum hydride and other alkali metal and alkaline earth metal hydrides into halogenated compounds, which requires a large amount of specially treated organic solvents. The synthesis cost is high, and it will cause waste of high-cost raw materials. The preparation process produces a large amount of organic waste liquid , which is more harmful to the human body, the separation and purification of the reaction product is complicated and difficult to handle

Therefore, the traditional method is relatively restrictive, which is not conducive to industrial production.

Images