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[Chemical Knowledge]：Production method and process of cyanamide

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Cyanamide is an important chemical raw material, widely used in medicine, pesticide, plastic, fiber and other fields. The following is the manufacturing method of cyanamide:

1. lime nitrogen method

lime nitrogen method is the main method of producing cyanamide at home and abroad. The method uses lime nitrogen as raw material and reacts with water vapor under heating conditions to produce cyanamide and calcium hydroxide. The reaction equation is as follows:

CaCN2 3H2O → 2H2CN2 Ca(OH)2

The specific operation steps are as follows:

1. Crush lime nitrogen to a certain particle size and mix it with water to form a paste.
2. The mixture is fed into a reactor, and steam is introduced to heat the reaction.
3. The reaction product is cooled, crystallized, centrifuged and dried to obtain the finished product of cyanamide.

the process is mature and the operation is simple, a large amount of waste residue and waste gas will be produced in the production process, which will cause certain pollution to the environment.

2. electrolysis method

electrolysis method is a more advanced cyanamide manufacturing method, through the electrolysis of the solution containing cyanide ions, the cyanide ions in the anode oxidation of cyanamide. The specific operation steps are as follows:

1. will contain cyanide ion solution into the electrolytic cell, through the direct current for electrolysis.
2. Cyanide ions on the anode are oxidized to form cyanamide, and hydrogen is precipitated on the cathode.
3. By controlling the current and electrolysis time, a higher purity cyanamide product can be obtained.

this method has the advantages of high product purity and no waste gas, the equipment investment is large and the energy consumption is high.

3. Acrylonitrile Process

Acrylonitrile process is a process for preparing cyanamide by the hydrolysis reaction of acrylonitrile. The specific operation steps are as follows:

1. mix acrylonitrile with water and heat to a certain temperature to hydrolyze acrylonitrile to acrylamide.
2. Acrylamide and ammonia reaction, cyanamide and acrylonitrile.
3. The unreacted acrylonitrile and the generated cyanamide are separated by distillation to obtain a higher purity cyanamide product.

the process is simple and easy to operate, certain waste water and waste gas will be produced in the production process, which needs to be effectively treated.

In summary, the above three methods can be used for the manufacture of cyanamide, but each method has its advantages and disadvantages and scope of application. In actual production, appropriate methods should be selected according to specific conditions, and environmental management should be strengthened to ensure that the production process meets environmental requirements.

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