| 摘要 |
The present invention relates to a method for the preparation of melamine from urea in which melamine is recovered from a reaction product produced by the pyrolysis of urea by cooling with a cooling medium in a supercritical state to obtain, without any further washing or purification, a commercially usable solid melamine product with a purity of 99.5 % by weight or higher. The preferred cooling medium is supercritical ammonia. |
