It is obtained by polymerization of urea. The urea is mixed with ammonium chloride, heated and melted, stirred and heated to 210 ° C to thicken the solution, and the temperature is raised to 230 ° C or higher. The melt gradually solidifies, and the mixture is uniformly stirred, and the temperature is further raised to 250 ° C for 15 minutes. Cool to 100 ° C, add a small amount of water to soak, reduce to room temperature, immerse in water, pulverize, filter out solids. Water and hydrochloric acid were added to the solid, stirred and heated to 110 ° C, kept for 3 h, supplemented with hydrochloric acid and water in portions, cooled to 30 ° C, washed with water until neutral, filtered, and the filter cake was washed with water and dried to obtain a finished product. The purity of industrial products is ≥95%, and the consumption of urea per ton of product is 1750kg.
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