Preparation method of higher safety for solid cyanamide

A cyanamide and safety technology, applied in the field of preparation of solid cyanamide, can solve the problems of unsafe product storage, transportation and use, unstable product performance, polymerization or decomposition, etc., to eliminate potential safety hazards and low cost , the effect of high crystal purity

Pending Publication Date: 2019-04-19
宁夏大荣化工冶金有限公司
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Problems solved by technology

[0004] The purity of the product obtained by the above method can reach more than 99%, but the organic solvent becomes a new impurity, and there are safety hazards and air pollution problems in the production process. At th...

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  • Preparation method of higher safety for solid cyanamide

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Embodiment 1

[0018] A kind of preparation method of solid cyanamide with higher safety, concrete steps are as follows:

[0019] Put 1600kg of liquid cyanamide with a concentration of 50-53% into the crystallizer, and obtain 900kg of crude crystal cyanamide with a content of 91-94% after freezing and cooling, and then dissolve it in deionized water again after being dried by a centrifuge. Completely dissolve to obtain a cyanamide liquid with a concentration of 63.7%, and then pass through a filter device to remove impurities, and the filtrate is cooled to 0°C by low-temperature salt water to obtain crystals, and after separation, move to a desiccator. Under the condition of a temperature lower than 40°C, Pass through the purified compressed air for drying to obtain solid cyanamide with a purity of 99.6%. The filtrate returns to the dissolving tank, and 400kg of crude crystals are added again. After dissolving and filtering, the temperature is cooled to 1°C with low-temperature salt water to...

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Abstract

The invention discloses a preparation method of higher safety for solid cyanamide. The method comprises the following steps that liquid cyanamide is driven into a crystallizer, after freezing and cooling, coarse cyanamide crystals are obtained, and the coarse cyanamide crystals are spin-dried by a centrifugal machine and then dissolved in water; after the crystals are dissolved completely, impurities in the crystals are removed by filtering equipment, filtered liquid is frozen and cooled to obtain crystals, and the crystals are separated out and dried at the low temperature to obtain the high-purity solid cyanamide; the filtered liquid flows into a dissolution kettle again for dissolving the coarse crystals and can be repeatedly used. The preparation method for the solid cyanamide has theadvantages that the technology is simple, the yield is high, the cost is low, the obtained cyanamide crystals are high in purity, and solves the problem that the solid cyanamide produced by adopting an alcohol separation method is difficult to store and transport, water as a solvent for recrystallization, and the hidden safety danger and pollution on air in the production process adopting dangerous chemicals of alcohol and the like as the solvent are eliminated.

Description

technical field [0001] The invention relates to a preparation method of solid cyanamide, in particular to a preparation method of solid cyanamide with safer process. Background technique [0002] Cyanamide, English name Cyanamide, also known as cyanamide, cyanamide, carbamamide, is a raw material for organic synthesis. Cyanamide contains cyano group and amino group, both of which are active groups. They have the multiple reactivity of the above-mentioned functional groups, and are prone to reactions such as addition, substitution, and condensation. When the purity of solid cyanamide is less than 95% and the moisture content is high, its performance is extremely unstable, and it is prone to polymerization or decomposition reactions during storage and transportation, and it may burn or explode when violent. [0003] The existing high-purity solid cyanamide production method is the alcohol analysis method, and its specific process is: high-concentration liquid cyanamide is cry...

Claims

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Application Information

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IPC IPC(8): C01C3/16
CPCC01C3/16C01P2006/80
Inventor 朱振林于建国
Owner 宁夏大荣化工冶金有限公司
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