| 摘要 |
A process for producing melamine crystals at high pureness is distinguished by the fact that it comprises a crys-tallisation step of a flow comprising substantially pure melt melamine by cooling with liquid ammonia and a thickening step of the resulting suspension of melamine crystals in liquid ammonia by separation of a portion of the liquid ammonia present in said sus-pension, whereby the liquid ammonia separated in said thickening step is reused as coolant in the crystallisation step. Also disclosed is a plant for producing melamina crystals at high pureness, comprising a crystallisation section (6) and a thickening section (7).
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