Method for continuously preparing sodium azide

A technology of sodium azide and sodium hydroxide, applied in the direction of azide/azide/halogen azide, etc., can solve the problem of large inorganic salt wastewater, achieve low energy consumption, easy to widely popularize, and simple process Effect

CN103523758AActive Publication Date: 2014-01-22青岛雪洁助剂有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-01-22

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Abstract

The invention provides a method for continuously preparing sodium azide. According to the method, the sodium azide is prepared through gas-liquid tower type continuous reaction and liquid-liquid continuous reaction, wherein ammonia gas and air serve as initial raw materials; and propanol, isopropanol, butanol, isobutanol, pentanol or isopentanol serve as carrier raw materials. Compared with the existing process, the method has the advantages that a large amount of inorganic salt waste water is avoided; all the harmful gases in a continuous system are recycled, so that danger is avoided; and the produced product has stable quality and is popularized in industry easily and widely.
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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...

Examples

Embodiment 1

[0042] 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 with the feed port of the first three-way valve D1, and a discharge port of the first three-way valve D1 is connected with the bottom of the first tower esterification reactor C1 tower body, and the first three-way valve D1 The other outlet is communicated with the bottom of the second tower type esterification reactor C2 tower body, and the first tower type esterification reactor C1 tower still and the second tower type esterification reactor C2 tower still pass through the pump respectively. The liquid is transported...

Embodiment 2

[0051] 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.

[0052] The method for continuously preparing sodium azide specifically comprises the following steps:

[0053] 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;

[0054] Step 2, the nitrogen oxides co...

Embodiment 3

[0060] 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.

[0061] The method for continuously preparing sodium azide specifically comprises the following steps:

[0062] 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;

[0063] Step 2, the nitrogen oxides cool...