Purification method of solid cyanamide

A purification method, a technology of cyanamide, applied in the field of purification of solid cyanamide, can solve the problems of cyanamide production enterprises such as storage and transportation difficulties, occurrence of combustion or explosion, easy polymerization or decomposition, etc. , Low production cost, good effect
CN101423231AInactive Publication Date: 2009-05-06宁夏大荣化工冶金有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
宁夏大荣化工冶金有限公司
Publication Date
2009-05-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a purification method of solid cyanamide, and the purification process is as follows: the solid cyanamide to be purified is added in a container which contains an organic solvent and is provided with a stirring device under the stirring state, the temperature is kept at the temperature of 20-40 DEG C, the solid cyanamide is filtered after full dissolution, filtrate is put in a container with cooling and stirring devices, the stirring is continuously carried out simultaneously when decreasing the temperature, when the temperature is decreased to minus 10-5 DEG C, the stirring is carried out for 20-60 minutes, then cyanamide crystals are filtered out, a finished product is obtained after drying, and the filtrate is recycled, and one part of solid cyanamide is dissolved in 0.2-1.5 parts of organic solvent. The purification method solves the problem of instability when the water content in the solid cyanamide is higher and is characterized by simple process, low production cost and good effect, thereby being applicable to large-scale industrial production and solving the problems of storage and transportation of liquid cyanamide at the natural environmental temperature, which confuse people for a long time.
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Description

Technical field

[0001] The invention relates to a purification method of solid cyanamide. Background technique

[0002] Cyanamide is also known as cyanamide and cyanamide. When the purity of solid cyanamide is less than 95% and the moisture content is high, its performance is extremely unstable. It is easy to polymerize or decompose during storage and transportation, and it will burn or burn when it is violent. Explosion, and the higher purity cyanamide has better stability, but because there is no good method for the purification of solid cyanamide, especially the water in the solid cyanamide cannot be removed by common means, which It brings great difficulties to the storage and transportation of cyanamide production enterprises. Summary of the invention

[0003] The purpose of the present invention is to provide a method for purifying solid cyanamide, which improves the stability of solid cyanamide by increasing the purity of the solid cyanamide.

[0004] In order to achieve ...

Claims

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