PROCESS FOR THE PREPARATION OF MELAMINE

摘要

Process for the preparation of melamine from urea via a high-pressure proces s in which dry melamine powder is obtained by transferring the melamine melt leaving the reactor to a vessel in which the melamine melt is cooled by means of ammonia characterized in that the melamine melt is sprayed into a cooling vessel and cooled by droplets of evaporating liquid ammonia which is sprayed into the same cooling vessel at a pressure above 0.1 MPa and a temperature between 50 .degree.C and the melting point of the melamine in the cooling vessel.