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Spray drying method for purifying LiAlH4

A spray drying method and drying technology, which is applied in the field of purifying LiAlH4, can solve the problems that limit the application of LiAlH, achieve good air tightness, high purity, and expand the application range

Inactive Publication Date: 2016-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem of industrial grade LiAlH 4 Contains a large amount of LiCl impurities, which limits the LiAlH 4 The problem of application, thus providing spray-drying method to purify LiAlH 4 Methods

Method used

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  • Spray drying method for purifying LiAlH4
  • Spray drying method for purifying LiAlH4
  • Spray drying method for purifying LiAlH4

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specific Embodiment approach 1

[0017] Embodiment 1: The spray drying method described in this embodiment purifies LiAlH 4 method, which includes the following steps:

[0018] Step 1. Add unpurified LiAlH to the container 4 , while stirring, slowly add anhydrous ether to obtain a mixed solution;

[0019] Step 2, filter the mixed solution obtained in step 1 with a sand core funnel to obtain a filtrate;

[0020] Step 3, spray-dry the filtrate obtained in step 2 with spray drying equipment to obtain purified LiAlH 4 ;

[0021] The steps one, two and three are all carried out under anhydrous and oxygen-free conditions.

[0022] In this embodiment, low-cost industrial-grade LiAlH is used 4 As a raw material, LiAlH was dried by filtration under mild conditions with spray drying equipment 4 Diethyl ether solution, fast spray drying rate, obtains LiAlH with high purity, high yield and good crystallinity 4 , is LiAlH 4 It provides a basis for large-scale purification applications, and has a very broad market ...

specific Embodiment approach 2

[0023] Specific embodiment 2: This embodiment is to purify LiAlH by the spray drying method described in specific embodiment 1 4 In this embodiment, in step 3, the flow rate of the nozzle of the spray drying equipment is 1.1L / h~1.4L / h.

specific Embodiment approach 3

[0024] Embodiment 3: This embodiment is to purify LiAlH by the spray drying method described in Embodiment 1 or 2 4 In this embodiment, in step 3, the inlet temperature of the spray drying equipment is 42°C to 48°C.

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Abstract

The invention discloses a spray drying method for purifying LiAlH4, and relates to the technical field of LiAlH4 purification. The invention aims to solve the problem that industrial grade LiAlH4 contains a large amount of LiCl impurity, and the application of t industrial grade LiAlH4 is limited. The method comprises the following steps: stirring unpurified LiAlH4, at the same time, slowly adding anhydrous ether to obtain a mixed solution, filtering the mixed solution by a sand core funnel to obtain filtrate, and subjecting the filtrate to spray drying so as to obtain purified LiAlH4. The provided spray drying method can rapidly process industrial grade LiAlH4 in a large scale. The production efficiency is improved, and the application range of LiAlH4 is enlarged. The obtained LiAlH4 has the advantages of high purity, high yield, and good crystallinity. The method provides technology foundation for large scale purification and application of LiAlH4 and has a wide market and application prospect. The method is suitable for LiAlH4 purification.

Description

technical field [0001] The present invention relates to purification of LiAlH 4 The technical field, in particular to the purification of LiAlH by spray drying 4 Technology. Background technique [0002] Lithium aluminum tetrahydrogenide is a very active chemical reagent, used to prepare a variety of metal and non-metal hydrides, and can also complex metal hydrides, and is widely used as a reducing agent for organic reactions to reduce carboxyl, carbonyl, Amide bond and ester group are used as precursors of aluminized protective films on the surface of substances and as co-catalysts for olefin polyaddition reactions. [0003] As one of the main new energy sources in the 21st century, tetrahydroaluminum lithium can also be used as a good hydrogen storage material and has important uses in aerospace and military. It is an additive for rocket solid propellants and high-energy fuels. Because of its high energy, environmental friendliness, and simple post-processing, it has a ...

Claims

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Application Information

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IPC IPC(8): C01B6/34C01B6/24
CPCC01B6/34C01B6/243C01P2002/72C01P2004/03C01P2006/80
Inventor 杨玉林王会淞范瑞清王平林凯峰高跃岳
Owner HARBIN INST OF TECH
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