公开(公告)号：EP2119710A1

公开(公告)日：2009-11-18

申请号：EP08008958.4

申请日：2008-05-14

申请人： UREA CASALE S.A.

发明人： Sioli, Giancarlo

IPC分类号： C07D251/60

CPC分类号： C07D251/60 ,  B01J10/005 ,  B01J19/0013 ,  B01J19/002 ,  B01J19/006 ,  B01J19/0066 ,  B01J19/18 ,  B01J2219/0004 ,  B01J2219/00083 ,  B01J2219/00135 ,  B01J2219/00189 ,  B01J2219/00768 ,  B01J2219/182 ,  B01J2219/185 ,  B01J2219/1943

摘要： A process for high-pressure, liquid phase conversion of urea into melamine is disclosed, where molten urea is fed to a first reaction zone (S1) where the melamine melt is under mechanical agitation, and a heat input (Q1) is provided to maintain the endothermic reaction, and the liquid is then passed to a second reaction zone (S2) kept at a lower temperature and where further agitation is provided. Embodiments of plants adapted to carry out the process are also disclosed, including multiple stirred reactors in cascade and a single reactor with multiple internal compartments defining said first and second reaction zones.

摘要翻译： 公开了一种将尿素高压液相转化为三聚氰胺的方法，其中将熔融的尿素进料到三聚氰胺熔体在机械搅动下的第一反应区（S1），并且提供热输入（Q1）以维持 然后将吸热反应和液体通入保持在较低温度的第二反应区（S2）并进一步搅拌。 还公开了适于实施该方法的设备的实施方案，包括级联的多个搅拌反应器和具有限定所述第一和第二反应区域的多个内部隔室的单个反应器。

公开(公告)号：EP2098516A1

公开(公告)日：2009-09-09

申请号：EP08004013.2

申请日：2008-03-04

申请人： UREA CASALE S.A.

发明人： Sioli, Giancarlo

IPC分类号： C07D251/60 ,  C07D251/62 ,  B01J19/18

CPC分类号： C07D251/62 ,  B01D9/0013 ,  B01J19/006 ,  B01J19/18 ,  B01J19/1862 ,  B01J19/1881 ,  B01J2219/00083 ,  B01J2219/00768 ,  C07D251/46 ,  C07D251/52 ,  C07D251/60

摘要： The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of:
- quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates,
- recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,
- treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content.
The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant.

摘要翻译： 本发明涉及获得高纯度三聚氰胺的方法，其特征在于包括以下步骤：猝灭三聚氰胺熔体，除去三聚氰胺合成物的废气，并含有三聚氰胺杂质如氨米林，ammelide和缩聚物，其中包含 氨在基本上将缩聚物转化为三聚氰胺，获得基本上不含缩聚物的三聚氰胺溶液， - 通过三聚氰胺结晶从所述三聚氰胺溶液中回收三聚氰胺，获得三聚氰胺晶体和三聚氰胺结晶母液， - 在条件下处理所述结晶三聚氰胺母液 从而将其至少一部分的ammeline含量转化成ammelide和melamine，从而获得至少具有降低的ammeline含量的经处理的母液。 本发明还涉及用于生产高纯度三聚氰胺的高压非催化装置，其实施上述方法和适用于该装置的装置。