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Synthesis method of lithium amide

A synthesis method, lithium amide technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as high cost, danger, complex reaction process, etc., achieve high efficiency and cost, cost saving, and high operational safety Effect

Active Publication Date: 2020-12-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have the disadvantages of complex reaction process, high energy consumption and high cost.
[0003] The general conditions of the existing lithium amide preparation method require high temperature, and the preparation at high temperature not only takes a long time but also has certain dangers

Method used

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  • Synthesis method of lithium amide

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Under an argon atmosphere, uniformly mix 0.95g of calcium hydride and 0.54g of lithium hydroxide into the ball milling jar, wherein the ratio of the total weight of the balls to the total weight of the material is 60:1, and the ball milling jar is continuously milled at a speed of 500r / min. 24h. After vacuuming the ball mill jar with a vacuum pump, feed ammonia gas into the ball mill jar and the molar ratio of ammonia gas to lithium hydroxide is 2:1, and then continue to mill the ball mill jar at a speed of 500r / min for 24 hours. The product obtained after ball milling is a mixture of lithium amide and calcium oxide. The product is transferred to a separation container under an argon atmosphere, and then liquid ammonia is introduced into the separation container, and the calcium oxide is filtered out through solid-liquid separation, and the remaining liquid substance is heated. At 50°C, after all the liquid ammonia is converted into ammonia gas and collected, lithium am...

Embodiment 2

[0029] Under an argon atmosphere, uniformly mix 0.89g of calcium hydride and 0.61g of lithium hydroxide into the ball milling tank, wherein the ratio of the total weight of the balls to the total weight of the material is 100:1, and the ball milling tank is continuously milled at a speed of 500r / min 60h. After vacuuming the ball mill jar with a vacuum pump, feed ammonia gas into the ball mill jar with a molar ratio of ammonia gas to lithium hydroxide of 4:1, and then continue to mill the ball mill jar at a speed of 400r / min for 12 hours. After ball milling, the mixture of lithium amide and calcium oxide is obtained, which is transferred to a separation container under an argon atmosphere, and then liquid ammonia is introduced into the separation container, and the calcium oxide is filtered out through solid-liquid separation, and the remaining liquid substance is heated to 60°C , After all the liquid ammonia is converted into ammonia gas and collected, lithium amide is obtaine...

Embodiment 3

[0031] Under a helium atmosphere, uniformly mix 0.61g of calcium hydride and 0.39g of lithium hydroxide into the ball mill jar, wherein the ratio of the total weight of the balls to the total weight of the material is 40:1, and the ball mill is continuously milled at a speed of 300r / min. 12h. Use a vacuum pump to evacuate the ball mill jar and then feed ammonia gas into the ball mill jar with a molar ratio of ammonia gas to lithium hydroxide of 3:1, then continue to mill the ball mill jar at a speed of 500r / min for 3h. After the ball milling, the mixture of lithium amide and calcium oxide is obtained, which is transferred to the separation container under the helium atmosphere, and then liquid ammonia is introduced into the separation container, and the calcium oxide is filtered out through solid-liquid separation, and the remaining liquid substance is heated to 40°C , After all the liquid ammonia is converted into ammonia gas and collected, lithium amide is obtained.

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Abstract

The invention relates to the field of material synthesis, in particular to a synthesis method of lithium amide. Directed at the existing problems of few lithium amide synthesis method, high process energy consumption and the like, the invention discloses a synthesis method of lithium amide. The method comprises the following steps of: taking lithium hydroxide, calcium hydride and ammonia gas as the raw materials, performing ball milling in vacuum, then performing ball milling in an ammonia gas atmosphere, performing liquid ammonia separation on a product after the reaction is finished, and drying a liquid substance, thereby obtaining the lithium amide. The synthesis method of lithium amide provided by the invention is simple in process, low in cost and high in safety.

Description

technical field [0001] The invention belongs to the field of material synthesis and relates to a synthesis method of lithium amide. Background technique [0002] Lithium amide is an inorganic compound. It is mainly used in organic synthesis and drug manufacturing, and it is also a hydrogen storage material with good prospects. At present, the methods for preparing lithium amide mainly include: (1) industrially use lithium hydride and ammonia gas to prepare lithium amide at high temperature; (2) use lithium metal to form lithium bronze under ammonia gas environment, and then react with aryl olefins and separate Lithium amide is obtained [I.V.J. Archer, a process for the preparation of lithium amide and compositions obtainable by said process. Manchester, UK, 2007]. The above methods have the disadvantages of complicated reaction process, high energy consumption and high cost. [0003] The general conditions of the existing lithium amide preparation method require high tem...

Claims

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Application Information

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IPC IPC(8): C01B21/092
CPCC01B21/0926
Inventor 梁初胡梦茹孙鑫黄辉张文魁甘永平夏阳张俊
Owner ZHEJIANG UNIV OF TECH
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