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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

Inactive Publication Date: 2009-05-06
宁夏大荣化工冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 of cyanamide has better stability, but because there is no good method for the purification of solid cyanamide at present, especially the moisture in solid cyanamide cannot be removed by common means. It has brought great difficulties to the storage and transportation of cyanamide production enterprises

Method used

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  • Purification method of solid cyanamide

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Effect test

Embodiment 1

[0009] Take 60g of methanol (purity 99.5%) into a 500mL three-necked flask equipped with a stirrer and thermometer, while stirring, add 300g of solid cyanamide (purity 93.0%) produced by cooling and crystallization of liquid cyanamide. Heat the water bath to 25°C to fully dissolve the solid cyanamide, and then filter to filter out the impurities in the cyanamide. The resulting filtrate is collected in a 500mL three-necked flask equipped with a stirrer and a thermometer, and the three-necked flask is put into frozen brine Cool and crystallize while turning on the stirrer. When the temperature drops below -5°C, continue to stir for 20 minutes, filter the precipitated crystals, and recycle the mother liquor. The filtered crystals were dried in vacuum to obtain a white stable solid cyanamide.

Embodiment 2

[0011] Take 110g of methanol (purity 99.5%) into a 500mL three-necked flask equipped with a stirrer and thermometer, while stirring, add 200g of solid cyanamide (purity 93.0%) produced by cooling and crystallization of liquid cyanamide. The water bath was heated to 40°C to fully dissolve the solid cyanamide, and then filtered. The resulting filtrate was collected in a 500mL three-necked flask equipped with a stirrer and a thermometer. The three-necked flask was placed in frozen brine to cool and crystallize, and the stirrer was turned on. When the temperature drops below 5°C, the precipitated crystals are filtered and the mother liquor is recycled. The filtered crystals were dried in vacuum to obtain a white stable solid cyanamide.

Embodiment 3

[0013] Take 150g of methanol (purity 99.5%) into a 500mL three-necked flask equipped with a stirrer and thermometer, while stirring, add 100g of solid cyanamide (purity 93.0%) produced by cooling and crystallization of liquid cyanamide, The water bath was heated to 30°C to fully dissolve the solid cyanamide, and then filtered. The resulting filtrate was collected in a 500 mL three-necked flask equipped with a stirrer and a thermometer. The three-necked flask was placed in frozen brine to cool and crystallize, and the stirrer was turned on. When the temperature drops below 0°C, the precipitated crystals are filtered and the mother liquor is recycled. The filtered crystals were dried in vacuum to obtain a white stable solid cyanamide.

[0014] In the above three embodiments, under other conditions unchanged, methanol will be replaced with ethanol, ether, and acetone respectively, and high-purity cyanamide can also be obtained.

[0015] The stability of solid cyanamide purified by th...

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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.

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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Application Information

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IPC IPC(8): C01C3/16
Inventor 赵黎明
Owner 宁夏大荣化工冶金有限公司
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