25451-10-9Relevant articles and documents
Preparation method of cyanuric acid
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Paragraph 0049-0052; 0054-0057; 0059-0062; 0065-0068; 0071, (2020/11/25)
The invention discloses a preparation method of cyanuric acid. The preparation method comprises the following steps: drying and dehydrating urea to obtained treated urea for subsequent usage; then adding an auxiliary agent and the dried and dehydrated urea into a reaction container, and carrying out a direct reaction under the protection of nitrogen so as to obtain a carbamate (R-O-CONH2) derivative after the reaction; and carrying out a thermal cracking reaction on the obtained carbamate derivative or a mixture of the carbamate derivative and urea under the protection of nitrogen, treating the obtained reaction product to obtain a cyanuric acid product, and recycling mother liquor after separation. The cyanuric acid is prepared by adopting a two-step process, and acid pickling refining isnot needed, so the method belongs to a novel environment-friendly process; reaction time is short, continuous production can be achieved, and production efficiency is improved; and finally, auxiliarymaterials are recycled in the production process, energy is saved, emission is reduced, production cost can be reduced, and obvious economic benefits and social benefits are realized.