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Synthesis method of sodium azide

A synthetic method, sodium azide technology, applied in the direction of azide acid/azide/halogen azide, etc., can solve the problems of not being suitable for large-scale industrial production, poor control of the reaction process, incomplete gas-liquid reaction, etc. , to achieve the effects of easy control of the process, increased yield and complete reaction

Inactive Publication Date: 2015-12-09
ANHUI LANGXI LIANKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the reaction process of this method is not easy to control. The reaction itself is an exothermic reaction at a temperature of 40-60 degrees. Ethyl nitrite becomes a gas at room temperature and is pressurized. Once the control is not good, danger will occur. At the same time, the gas-liquid reaction is not complete, and the reaction time is relatively long, so it is not suitable for large-scale industrial production.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 1000g of sodium nitrite, 1200g of isoamyl alcohol and 2600ml of water into the reaction tank, stir; drop the temperature to 4°C, add 1200g of hydrochloric acid solution with a mass concentration of 30% continuously, and keep it warm for 1 hour; remove acid and water to obtain isonitrite Amyl esters.

[0023] Under normal temperature and common use, 1000 g of the above-mentioned isoamyl nitrite is continuously added dropwise to basic hydrazine hydrate composed of 1200 g of sodium hydroxide and 1400 g of hydrazine hydrate to react to prepare sodium azide crystals.

[0024] The method for synthesizing sodium azide of the present invention adopts liquid-liquid homogeneous phase reaction, complete reaction, easy process control, stable and safe operation, increased yield by more than 5%, low comprehensive cost, and is suitable for large-scale industrial production.

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Abstract

The invention discloses a synthesis method of sodium azide. According to the synthesis method, sodium nitrite and isoamyl alcohol are taken as the initial raw materials; sodium nitrite and isoamyl carry out reactions, the reaction product is isoamyl nitrite, isoamyl nitrite is dropwise added into alkaline hydrazine hydrate to carry out reactions, and the reaction product is sodium azide crystal. In the provided synthesis method, liquid-liquid homogenous reactions are carried out, the process is easy to control, the operation is stable and safe, the yield is improved by 5% or more, the comprehensive cost is low, and the synthesis method can be applied to industrial massive production.

Description

technical field [0001] The invention specifically relates to a method for synthesizing sodium azide, belonging to the field of chemical industry. Background technique [0002] Sodium azide (NaN3) is a colorless and odorless hexagonal crystal, which is usually used in the synthesis of medicine, explosives, photographic agents, resins and pesticides. In recent years, the industry of installing airbags in automobiles has risen, and NaN3 is the most ideal gas generant raw material for passive damping airbags in automobiles. [0003] The more advanced preparation method of sodium azide in the existing literature is: ethyl nitrite gas and hydrazine hydrate aqueous phase pressurized synthesis, no solvent, and low cost. However, the reaction process of this method is not easy to control. The reaction itself is an exothermic reaction at a temperature of 40-60 degrees. Ethyl nitrite becomes a gas at room temperature and is pressurized. Once the control is not good, danger will occur....

Claims

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Application Information

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IPC IPC(8): C01B21/08
Inventor 贾玉梁张富成
Owner ANHUI LANGXI LIANKE IND
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