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1. 发明申请

WO2003022823A1 PROCESS FOR OBTAINING CRYSTALLINE MELAMINE FROM MELAMINE MELT 审中-公开
标题翻译：从熔体熔体中获得晶体烯烃的方法
公开(公告)号：WO2003022823A1
公开(公告)日：2003-03-20
申请号：PCT/EP2002/010015
申请日：2002-09-06
申请人： DSM N.V. , TJIOE, Tjay, Tjien , CLAASSEN, Johannes, Bernardus, Jacobus
发明人： TJIOE, Tjay, Tjien , CLAASSEN, Johannes, Bernardus, Jacobus
IPC分类号： C07D251/60
CPC分类号： C07D251/62 , C07D251/60
摘要： The invention relates to a process for obtaining crystalline melamine from a melamine melt, comprising: a) a cooling step, in which the melamine melt is given a pressure between 0.1 MPa and 20 MPa and a temperature below the melting point of melamine at the prevailing pressure, upon which solid melamine is formed; b) a pressure adjustment step, in which the pressure of the solid melamine is adjusted to a value between 0.1 and 5 MPa; c) a dissolving step, in which the solid melamine is contacted with an aqueous phase that has a pH between 6 and 13 and in which less than 5 wt.% ammonia is present, upon which a solution is formed; d) a crystallization step, in which the solution is cooled by at least 20 °C, upon which crystalline melamine is formed; e) a separation step, in which crystalline melamine is separated from the solution.
摘要翻译：本发明涉及一种从三聚氰胺熔体中获得结晶三聚氰胺的方法，包括：a）冷却步骤，其中三聚氰胺熔体的压力为0.1MPa至20MPa，温度低于三聚氰胺的熔点形成固体三聚氰胺的压力; b）压力调节步骤，其中将固体三聚氰胺的压力调节至0.1至5MPa的值; c）溶解步骤，其中固体三聚氰胺与pH在6和13之间并且其中存在少于5重量％的氨的水相接触，在其上形成溶液; d）结晶步骤，其中将溶液冷却至少20℃，在其上形成结晶三聚氰胺; e）分离步骤，其中结晶三聚氰胺与溶液分离。

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