Novel method for preparing lithium aluminum hydride

Abstract

The invention relates to a novel method for preparing lithium aluminum hydride. The method comprises the following steps of: 1-, fully dissolving aluminum trichloride in anhydrous ether to prepare a diethyl ether solution of the aluminum trichloride; 2-, crushing lithium hydride particles into powder by adopting a screen mesh under the protection of nitrogen; putting the crushed lithium hydride powder into diethyl ether under the protection of the nitrogen; putting into a reaction kettle, and then evenly mixing to form a uniform lithium hydride and diethyl ether suspension for later use; 3-, mixing the diethyl ether solution of the aluminum trichloride prepared in the step (1) with the lithium hydride and diethyl ether suspension prepared in the step (2) for full reaction; and 4-, collecting clear liquid into a container after byproduct lithium chloride is deposited; performing static distillation to evaporate the diethyl ether in the clear liquid to dryness to obtain a required lithium aluminum hydride solid product. The novel method for preparing the lithium aluminum hydride is simple, safe and reliable, is low in production cost and good in product quality.

Description

technical field [0001] The invention relates to a metal hydride, in particular to a preparation method of a novel lithium aluminum hydride. Background technique [0002] Lithium aluminum hydride is a strong reducing agent that can reduce organic functional groups. It is stable in dry air and hydrolyzed in humid air and causes combustion. The most typical method of synthesizing lithium aluminum hydride is to react metal lithium with hydrogen at high temperature to generate hydrogenation Lithium, and then lithium hydride is finely ground and reacted with aluminum trichloride in the presence of an initiator in anhydrous ether to generate lithium aluminum hydride. Because it needs to add an initiator and is flammable, large-scale production is hindered. Therefore, it is a very important subject to explore new methods for preparing lithium aluminum hydride. [0003] The application number is 87101196, and the title of the invention is "Synthetic Method of Lithium Aluminum Hydrid...

AI Technical Summary

Problems solved by technology

[0003] The application number is 87101196, and the title of the invention is "Synthetic Method of Lithium Aluminum Hydride", which discloses a synthetic method of lithium aluminum hydride, the content of which is to react lithium metal with hydrogen in the presence of a solvent and a catalyst at normal temperature and pressure to form lithium hydride , and then lithium hydride reacts with aluminum trichloride to generate lithium aluminum hydride. This method has many by-products and potential unsafe problems