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Method for continuous preparation of sodium azide

A technology of sodium azide and nitrogen oxides, applied in the direction of azide acid/azide/halide azide, etc., can solve the problems of waste water, large inorganic salts, etc., achieve low energy consumption, simple operation, easy to widely popularize Effect

Active Publication Date: 2014-02-05
青岛雪洁助剂有限公司
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Problems solved by technology

[0004] In view of the defects and deficiencies in the prior art, the purpose of the present invention is to provide a method for continuously preparing sodium azide, which can realize the continuous production of sodium azide preparation process and solve the problem of producing a large amount of inorganic salts in the production process. waste water problem

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  • Method for continuous preparation of sodium azide

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Embodiment 1

[0038] The present embodiment provides a kind of method for continuously preparing sodium azide, and the method adopts such as figure 1 The continuous reaction device shown realizes the continuous preparation of sodium azide, and described continuous reaction device comprises ammonia oxidation furnace A, and the top of ammonia oxidation furnace A communicates with the feed inlet of heat exchanger B, and the top of heat exchanger B The discharge port is connected to the bottom of the tower body of the tower esterification reactor C, and the tower still of the tower esterification reactor C transfers the tower liquid to the top of the tower body through a pump, and the top of the tower body of the tower esterification reactor C It is connected with the bottom of the condenser D1, the bottom of the condenser D1 is connected with the top of the heater D2, the top of the heater D2 is connected with the feed port of the three-way valve, and one discharge port of the three-way valve i...

Embodiment 2

[0046] The present embodiment provides a kind of method for continuously preparing sodium azide, and the method adopts such as figure 1 Shown continuous reaction device realizes the continuous preparation of sodium azide, and continuous reaction device is identical with embodiment 1.

[0047] The method for continuously preparing sodium azide specifically comprises the following steps:

[0048] Step 1: Pass ammonia and air respectively from the bottom of ammonia oxidation furnace A to carry out catalytic oxidation reaction, and the generated nitrogen oxides are passed to the bottom of heat exchanger B for heat exchange, and the temperature of nitrogen oxides is reduced to 30°C-40°C °C, wherein: the reaction temperature of ammonia oxidation is controlled within the range of 700 °C to 720 °C, the pressure is within the range of 0.1 to 0.15 Mpa, the molar ratio of ammonia to oxygen is 1:1.5, and the catalyst is a platinum-rhodium catalyst;

[0049] Step 2, the nitrogen oxides co...

Embodiment 3

[0054] The present embodiment provides a kind of method for continuously preparing sodium azide, and the method adopts such as figure 1 Shown continuous reaction device realizes the continuous preparation of sodium azide, and continuous reaction device is identical with embodiment 1.

[0055] The method for continuously preparing sodium azide specifically comprises the following steps:

[0056] Step 1: Pass ammonia and air respectively from the bottom of ammonia oxidation furnace A to carry out catalytic oxidation reaction, and the generated nitrogen oxides are passed to the bottom of heat exchanger B for heat exchange, and the temperature of nitrogen oxides is reduced to 30°C-40°C °C, wherein: the reaction temperature of ammonia oxidation is controlled within the range of 700 °C to 720 °C, the pressure is within the range of 0.1 to 0.15 Mpa, the molar ratio of ammonia to oxygen is 1:1.5, and the catalyst is a platinum-rhodium catalyst;

[0057] Step 2, the nitrogen oxides co...

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Abstract

The invention provides a method for continuous preparation of sodium azide. The method adopts ammonia gas and air as initial raw materials, and takes low-boiling point methanol, ethanol, propanol or isopropanol as a carrier raw material to prepare sodium azide by gas-liquid tower type continuous reaction. Compared with the prior art, the method provided by the invention no longer generates a lot of inorganic salt wastewater. In a continuous system, all harmful gases are all recycled so as to avoid dangers, and the produced product has stable quality. Thus, the method is easy to popularize widely in industry.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to sodium azide, in particular to a method for continuously preparing sodium azide. Background technique [0002] Sodium azide is a very useful chemical raw material in military industry, automobile industry and pharmaceutical fields. There are mainly four methods for its synthesis method based on the classification of the main raw materials used. The earliest process is the sodium method, which has been eliminated due to the danger of its production; the second and third methods are the guanidine nitrate method and the urea method, which have not yet been industrialized due to their complicated production processes; the fourth method is the hydrazine method , The hydrazine method has become the main method used in industry due to its safety in production. [0003] What mainly adopts in industry at present is batch method, is to be that raw material first generates nitrite with sulfu...

Claims

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Application Information

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IPC IPC(8): C01B21/08
Inventor 刘林学张明英李建民
Owner 青岛雪洁助剂有限公司
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