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公开(公告)号：EP1444214B2
公开(公告)日：2009-12-16
申请号：EP02787377.7
申请日：2002-11-14
发明人： SCHRÖDER, Frank , RUECH, Wolfgang , NEUMÜLLER, Christoph , KOGLGRUBER, Ferdinand , WAGNER, Hans, Christian
IPC分类号： C07D251/62
CPC分类号： C07D251/62
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公开(公告)号：EP1444214A1
公开(公告)日：2004-08-11
申请号：EP02787377.7
申请日：2002-11-14
发明人： SCHRÖDER, Frank , RUECH, Wolfgang , NEUMÜLLER, Christoph , KOGLGRUBER, Ferdinand , WAGNER, Hans, Christian
IPC分类号： C07D251/62
CPC分类号： C07D251/62
摘要： The invention relates to a method for producing melem-free melamine by means of aqueous processing of a melted mass of melamine which is obtained using a high-pressure method. According to the inventive method, the melted mass of melamine is quenched by means of an aqueous solution containing alkalis, following the isolation of the off-gases, and is directly transferred into an aqueous alkaline melamine solution, out of which the melamine is then crystallised. The invention thus enables melamine to be obtained, with a melam content of less than 1000 ppm and a melem content of less than 50 ppm. The invention also relates to a quenching agent.
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公开(公告)号：EP1328520B1
公开(公告)日：2007-12-05
申请号：EP01978413.1
申请日：2001-10-15
IPC分类号： C07D251/60
CPC分类号： C07D251/60 , B01J3/04 , B01J4/002 , B01J4/005 , B01J10/005 , B01J19/006 , B01J19/246 , B01J2219/00078
摘要： The invention relates to a method for producing melamine by means of pyrolysis of urea in a high-pressure reactor with a vertical centre tube, wherein the melamine flows from the bottom to the top of the reactor, is mixed in the lower part of the reactor with a urea melt introduced into the reactor from below and, optionally, NH3, the melamine is discharged from the centre tube in the upper part thereof, part of the melamine thus formed flows downwards in the annulus between the centre tube and the reactor wall, the remaining part being transferred outwardly for further processing and the off gases are separated. The invention also relates to a reactor for carrying out said method.
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公开(公告)号：EP1444214B1
公开(公告)日：2005-07-13
申请号：EP02787377.7
申请日：2002-11-14
发明人： SCHRÖDER, Frank , RUECH, Wolfgang , NEUMÜLLER, Christoph , KOGLGRUBER, Ferdinand , WAGNER, Hans, Christian
IPC分类号： C07D251/62
CPC分类号： C07D251/62
摘要： The invention relates to a method for producing melem-free melamine by means of aqueous processing of a melted mass of melamine which is obtained using a high-pressure method. According to the inventive method, the melted mass of melamine is quenched by means of an aqueous solution containing alkalis, following the isolation of the off-gases, and is directly transferred into an aqueous alkaline melamine solution, out of which the melamine is then crystallised. The invention thus enables melamine to be obtained, with a melam content of less than 1000 ppm and a melem content of less than 50 ppm. The invention also relates to a quenching agent.
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