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2023-10-28 09:53
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Xiangmei Chemical Co.,LtdBy certification [File Integrity]
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Website:http://www.cyanamidexm.com/ http://nxxmhg.jssytm.com/
Monocyanamide can be seen from the molecular structure H2N-C≡N of aminocyanide, which is composed of two active groups of amino and cyano groups, and its chemical properties are very lively. And polymerization.
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1 Hydrolysis
It can be seen from the hydrolysis curve and polymerization curve of the mass fraction 50% cyanamide solution at 25 ℃ that in weak acid or weak base solutions below 15 ℃, cyanamide does not undergo hydrolysis, but at 25 ℃, pH At 12 o'clock, the hydrolysis reaction is completed quickly, producing urea.
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2 Polymerization
Like the hydrolysis reaction, the polymerization reaction of cyanamide is closely related to the acidity and temperature of the solution. When the pH is 8-10, and the temperature is greater than 40 ℃, it will rapidly polymerize into a more stable dicyandiamide, and the reaction is irreversible.
At room temperature, at pH 10, the tendency of cyanamide to hydrolyze to urea increases rapidly, while at pH> 6, the polymerization rate is significantly accelerated. Therefore, it is appropriate to control the pH of the solution at 4 to 5. When the pH is 4 ~ 5 and the temperature is controlled below 15 ℃, there is almost no hydrolysis and polymerization of cyanamide; the temperature is controlled at 20 ℃, and the mass fraction of 50% cyanamide aqueous solution increases the rate of dicyandiamide in about 3 months. . 8%, and when the temperature is controlled at 25 ~ 30 ℃, the dicyandiamide production rate will reach more than 8% within 3 months.
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