发明公开
EP2098516A1 Process for the production of high purity melamine from urea
审中-公开
Verfahren zur Herstellung hochreinen Melamins aus Harnstoff
- 专利标题： Process for the production of high purity melamine from urea
- 专利标题（中）： Verfahren zur Herstellung hochreinen Melamins aus Harnstoff
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申请号： EP08004013.2申请日： 2008-03-04
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公开(公告)号： EP2098516A1公开(公告)日： 2009-09-09
- 发明人: Sioli, Giancarlo
- 申请人： UREA CASALE S.A.
- 申请人地址： Via Giulio Pocobelli, 6 6900 Lugano-Besso CH
- 专利权人： UREA CASALE S.A.
- 当前专利权人： UREA CASALE S.A.
- 当前专利权人地址： Via Giulio Pocobelli, 6 6900 Lugano-Besso CH
- 代理机构： Zardi, Marco
- 主分类号： C07D251/60
- IPC分类号： C07D251/60 ; C07D251/62 ; B01J19/18
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.
- 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.
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