| 摘要 |
The process of producing from urea a reaction product which is predominantly cyanuric acid, which process involves only the application of heat without use of solvents or catalysts. The process in its first stage involves heating molten urea for a time and at a temperature to convert the urea to a first stage reaction product comprising less than 40% urea and at least 30% biuret, then cooling and comminuting the first stage reaction product, then as a second stage of the process, passing hot air through the comminuted first stage reaction product at temperatures progressively increasing but maintained below the melting point of the reaction, such solid phase heating of the reaction product during the second stage of the process being maintained until the cyanuric acid content is at least about 50% of the final reaction product and is preferably at least about 70%.
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