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Dicyandiamide preparation method

A technology of dicyandiamide and cyanamide, applied in the field of dicyandiamide preparation, can solve the problems of large equipment investment, high production cost, and long process route

Inactive Publication Date: 2021-01-12
宁夏蓝白黑循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The original production technology of electronic grade dicyandiamide is to dissolve-filter-crystallize industrial grade dicyandiamide, the process route is long, the equipment investment is large, and the production cost is high

Method used

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  • Dicyandiamide preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of dicyandiamide is characterized in that, comprises:

[0024] Step S11: mixing lime nitrogen and water for hydrolysis reaction, and introducing carbon dioxide for decalcification reaction to obtain an aqueous solution of calcium carbonate and cyanamide;

[0025] Step S12: Filter the cyanamide aqueous solution to remove particulate matter to obtain a pure cyanamide aqueous solution;

[0026] Step S13: heating and polymerizing the pure aqueous solution of cyanamide to obtain an aqueous solution of dicyandiamide;

[0027] Step S14: filtering, cooling, filtering and drying the dicyandiamide aqueous solution to obtain dicyandiamide crystals.

Embodiment 2

[0029] Step S21: mixing lime nitrogen and water for hydrolysis reaction, and introducing carbon dioxide for decalcification reaction to obtain an aqueous solution of calcium carbonate and cyanamide;

[0030] Step S22: Use a filter cloth to filter out particles with a particle size greater than 0.1 mm in the cyanamide aqueous solution, and then use a diatomaceous earth filter to filter particles with a particle size greater than 0.01 mm in the cyanamide aqueous solution under a pressure of 1 kg. Particles are filtered out to obtain pure cyanamide aqueous solution;

[0031] Step S23: heating and polymerizing the pure aqueous solution of cyanamide to obtain an aqueous solution of dicyandiamide;

[0032] Step S24: filtering, cooling, filtering and drying the dicyandiamide aqueous solution to obtain dicyandiamide crystals.

Embodiment 3

[0034] Step S31: mixing lime nitrogen and water for hydrolysis reaction, and introducing carbon dioxide for decalcification reaction to obtain an aqueous solution of calcium carbonate and cyanamide;

[0035] Step S32: Use a filter cloth to filter out particles with a particle size larger than 0.1 mm in the cyanamide aqueous solution, and then use a diatomaceous earth filter to filter the particles with a particle size larger than 0.01 mm in the cyanamide aqueous solution under a pressure of 1 kg. Particles are filtered out to obtain pure cyanamide aqueous solution;

[0036] Step S33: Under the condition of pH value of 8 and temperature of 30°C, heating and polymerizing the pure cyanamide aqueous solution to obtain dicyandiamide aqueous solution;

[0037] Step S34: filtering, cooling, filtering and drying the dicyandiamide aqueous solution to obtain dicyandiamide crystals.

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Abstract

The invention provides a dicyandiamide preparation method, which comprises: mixing lime nitrogen and water to carry out a hydrolysis reaction, and introducing carbon dioxide to carry out a decalcification reaction to obtain calcium carbonate and a cyanamide aqueous solution; filtering the cyanamide aqueous solution, and filtering out particles to obtain a pure cyanamide aqueous solution; heating and polymerizing the pure cyanamide aqueous solution to obtain a dicyandiamide aqueous solution; and filtering, cooling, filtering and drying the dicyandiamide aqueous solution to obtain dicyandiamidecrystals. By adopting the method, impurities such as calcium oxide, calcium hydroxide and calcium carbonate in dicyandiamide are removed, and the quality of a dicyandiamide product is improved.

Description

technical field [0001] The application relates to the technical field of industrial synthesis of dicyandiamide, in particular to a preparation method of dicyandiamide. Background technique [0002] Dicyandiamide (abbreviated as DICY or DCD), the molecular formula is (NH 2 EN) 2 , also known as dicyandiamide, dicyandiamide, is a white prismatic crystalline powder, soluble in water, alcohol, ethylene glycol and dimethylformamide, almost insoluble in ether and benzene, non-flammable, dry time stable. Electronic grade dicyandiamide is mainly used in high-end electronics industries, as epoxy resin curing agent, electronic packaging materials, FR-4 copper clad laminate production, and also as an intermediate for advanced coatings and chemical pharmaceuticals that require high purity of dicyandiamide Body raw materials, etc. With the development of electronic high-tech and medicine, the market demand is expanding year by year. [0003] The traditional dicyandiamide preparation ...

Claims

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Application Information

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IPC IPC(8): C07C279/28C07C277/08
CPCC07C277/08C01C3/16
Inventor 孙鹤周鹏马彦珍
Owner 宁夏蓝白黑循环科技有限公司
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