Method of preparing sodium azide

A sodium azide and sodium hydroxide technology, applied in the direction of azide/azide/halogen azide, etc., can solve the problems of complex process flow, difficult leakage control, low product yield, etc., and achieve the production process The effect of simple process, good product quality and high product yield

Inactive Publication Date: 2007-08-08
ANHUI LANGXI LIANKE IND +1
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  • Abstract
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  • Claims
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Problems solved by technology

The process is complicated, the operation steps are cumbersome, the product yield is low, the process weight yield (in terms of hydrazine hydrate) is 65%-70%, the product content is about 99%, CO 3 2- The content is about 0.3%
It is not easy to obtain high-purity products during production operations, and highly toxic hydrogen azide gas is produced during the production process, making it difficult to control leakage. Therefore, the requirements for operators are extremely strict

Method used

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Embodiment Construction

[0008] Concentration is that the sulfuric acid solution 200g of 70% is dripped in the solution that is made of ethanol 200g, sodium nitrite 400g and water 600g; And control the rate of addition of sulfuric acid solution. Then the flow of ethyl nitrite gas produced by it is stably controlled at 30M 3 / H, into a solution consisting of hydrazine hydrate 195g, sodium hydroxide 130g, catalyst-tetrabutylammonium bromide 1.6g and ethanol 330g at 70°C∽90°C; the reaction time is about 8 hours, and the azide produced Sodium azide was evaporated at 80°C∽90°C to remove the solvent ethanol; then, cooled to below 50°C, and subjected to solid-liquid separation to obtain 165g of sodium azide fine product. Process weight yield (in terms of hydrazine hydrate) is 85%, product content is more than 99.5%, CO 3 2- The content is below 0.1%.

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Abstract

The invention discloses a making method of sodium azide, which comprises the following steps: dripping sulfuric acid in the solution with alcohol, sodium nitrite and water; aerating ethyl nitrite gas into solution with hydrazine hydrate, sodium hydroxide, tetrabutylammonium bromide and alcohol; generating sodium azide; evaporating solvent; crystallizing; separating solid from liquid to obtain the product.

Description

technical field [0001] The invention relates to a preparation method of chemical products, in particular to a preparation method of sodium azide. Background technique [0002] At present, only a small number of sodium azide manufacturers in China have adopted the nitrite method. However, the process flow is to use multi-step reactions to obtain crude products, and then to obtain qualified products after refining. The specific process flow is: the low-grade Alcohol and sodium nitrite are put into a nitrite synthesis kettle in a certain proportion, sulfuric acid is added dropwise, and the generated nitrite gas is passed into the solution of hydrazine hydrate and sodium hydroxide to generate low-content sodium azide. After completion, centrifuge , to obtain the crude product sodium azide, then put the crude product and appropriate amount of water into the hydrogen azide synthesis kettle, add sulfuric acid dropwise to generate hydrogen azide, and the generated hydrogen azide gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/08
Inventor 贾玉梁刘种权
Owner ANHUI LANGXI LIANKE IND
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