Method for preparing sodium borohydride by recycling sodium metaborate

A technology of sodium borohydride and sodium metaborate, which is applied in chemical instruments and methods, metal hydrides, inorganic chemistry, etc., can solve the problem of reusing by-products, etc., and achieve the effects of easy control of reaction, simple and safe process, and cost reduction

Inactive Publication Date: 2010-02-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to realize the recycling of sodium metaborate, the present invention provides a method for recycling sodium metaborate to prepare sodium borohydride, using a high-energy ball mill to grind and prepare sodium borohydride, so as to solve the problem that the by-products of sodium borohydride fuel cells are regenerated after hydrolysis of hydrogen. problem of use

Method used

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  • Method for preparing sodium borohydride by recycling sodium metaborate
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  • Method for preparing sodium borohydride by recycling sodium metaborate

Examples

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Effect test

Embodiment 1

[0019] 1. Raw material handling

[0020] Sodium metaborate tetrahydrate is treated in a vacuum oven at 120-220°C, dried for more than 4 hours, and the crystal water is removed to obtain anhydrous sodium metaborate for later use.

[0021] 2. Synthesis of magnesium hydride

[0022] Weigh 60g of magnesium powder (passed through a 200 mesh sieve) and add it to an autoclave (GCF-1 autoclave), seal the autoclave, fill it with argon to vacuumize, and repeat 3 times, then turn on the power and heat the autoclave to 300°C, and then fill the autoclave. Hydrogen to 6.0MPa, react for 24h. After the reaction, stop heating, cool to room temperature, release the pressure to normal pressure, and fill with argon to protect the product.

[0023] 3. Synthesis of sodium borohydride

[0024] Weigh 1.32g of anhydrous sodium metaborate and 1.4g of magnesium hydride, put them into a ball mill tank (QM-3A high-speed vibrating ball mill), put steel balls into them according to a certain charging rat...

Embodiment 2

[0027] 1. Raw material handling

[0028] Sodium metaborate tetrahydrate is treated in a vacuum oven at 120-220°C, dried for more than 4 hours, and the crystal water is removed to obtain anhydrous sodium metaborate for later use.

[0029] 2. Synthesis of magnesium hydride

[0030] Weigh 60g of magnesium powder (over 200 mesh) into the autoclave (GCF-1 autoclave), seal the autoclave, fill it with argon and vacuumize, repeat 3 times, then turn on the power and heat the autoclave to 200°C, then fill it with hydrogen To 4.5MPa, react for 24h. After the reaction, stop heating, cool to room temperature, release the pressure to normal pressure, and fill with argon to protect the product.

[0031] 3. Synthesis of sodium borohydride

[0032] Weigh 1.32g of anhydrous sodium metaborate and 1.4g of magnesium hydride, put them into a ball mill tank (QM-3A high-speed vibrating ball mill), put steel balls in a certain charging ratio (mass ratio of ball to material: 30:1), and then vacuumiz...

Embodiment 3

[0034] 1. Raw material handling

[0035] Sodium metaborate tetrahydrate is treated in a vacuum oven at 120-220°C, dried for more than 4 hours, and the crystal water is removed to obtain anhydrous sodium metaborate for later use.

[0036] 2. Synthesis of magnesium hydride

[0037] Weigh 60g of magnesium powder (over 200 mesh) into the autoclave (GCF-1 autoclave), seal the autoclave, fill it with argon and vacuumize, repeat 3 times, then turn on the power and heat the autoclave to 300°C, then fill it with hydrogen To 6.0MPa, react for 24h. After the reaction, stop heating, cool to room temperature, release the pressure to normal pressure, and fill with argon to protect the product.

[0038] 3. Synthesis of sodium borohydride

[0039] Weigh 1.32g of anhydrous sodium metaborate and 1.0g of magnesium hydride, put them into a ball mill tank (QM-3A high-speed vibrating ball mill), put steel balls into them according to a certain charging ratio (mass ratio of ball to material: 50:1...

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Abstract

The invention relates to a method for preparing alkali metals hydroboron, in particular to a method for preparing sodium borohydride by recycling sodium metaborate, which solves the problem of recycling a byproduct sodium metaborate after the sodium borohydride is hydrolyzed to prepare hydrogen in the prior art, and is a novel method for preparing the sodium borohydride. The method takes magnesiumhydride as a hydrogen source and the sodium metaborate as a boron source, and prepares the sodium borohydride through mechanical and chemical reaction. In the presence of the hydrogen, magnesium powder is hydrogenated at certain temperature and pressure to prepare magnesium hydride; and the sodium metaborate and the magnesium hydride in a certain ratio are put into a ball mill, certain argon or hydrogen pressure, ratio of grinding media to material and grinding time are maintained, and the sodium metaborate can be reduced into the sodium borohydride. The method has the advantages of simple, convenient and safe process, no environmental pollution and the like.

Description

technical field [0001] The invention relates to a method for preparing borohydride, in particular to a method for recycling sodium metaborate to prepare sodium borohydride. Background technique [0002] Sodium borohydride is an excellent reducing agent and hydrogen storage material, especially as a hydrogen storage material, which can produce hydrogen by hydrolysis and become a hydrogen source carrier for fuel cells. There are many types of sodium borohydride fuel cells. After the fuel cell is used, its by-product is sodium metaborate. Recycling this material to prepare sodium borohydride will avoid environmental pollution and waste of resources. So it's a very meaningful job. [0003] Currently, NaBH is prepared from sodium metaborate 4 The methods mainly include electrolysis and high temperature and high pressure method. The electrolytic method uses sodium metaborate as raw material to directly electrolyze sodium borohydride. A bottleneck problem encountered by this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/17
Inventor 孔令艳崔新宇吴杰金花子熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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