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公开(公告)号：US20050131228A1
公开(公告)日：2005-06-16
申请号：US10495619
申请日：2002-11-14
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 crystallized. 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.
摘要翻译： 本发明涉及通过使用高压法获得的三聚氰胺熔融物质的水处理来生产无重量三聚氰胺的方法。 根据本发明的方法，在分离废气之后，通过含有碱的水溶液将三聚氰胺的熔融质量骤冷，并直接转移到碱性三聚氰胺水溶液中，然后将三聚氰胺结晶 。 因此，本发明能够获得三聚氰胺，其蜜胺含量小于1000ppm，并且肉眼含量小于50ppm。 本发明还涉及淬火剂。
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公开(公告)号：US07176309B2
公开(公告)日：2007-02-13
申请号：US10495619
申请日：2002-11-14
申请人： Frank Schröder , Wolfgang Ruech , Christoph Neumüller , Ferdinand Koglgruber , Hans Christian Wagner
发明人： Frank Schröder , Wolfgang Ruech , Christoph Neumüller , Ferdinand Koglgruber , Hans Christian Wagner
IPC分类号： C07D251/60 , 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 crystallized. 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.
摘要翻译： 本发明涉及通过使用高压法获得的三聚氰胺熔融物质的水处理来生产无重量三聚氰胺的方法。 根据本发明的方法，在分离废气之后，通过含有碱的水溶液将三聚氰胺的熔融质量骤冷，并直接转移到碱性三聚氰胺水溶液中，然后将三聚氰胺结晶 。 因此，本发明能够获得三聚氰胺，其蜜胺含量小于1000ppm，并且肉眼含量小于50ppm。 本发明还涉及淬火剂。
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公开(公告)号：US07022848B2
公开(公告)日：2006-04-04
申请号：US10953021
申请日：2004-09-28
CPC分类号： C07D251/60 , B01J3/04 , B01J4/002 , B01J4/005 , B01J10/005 , B01J19/006 , B01J19/246 , B01J2219/00078
摘要： A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.
摘要翻译： 提供了一种通过在具有垂直中心管的高压反应器中热解尿素来生产三聚氰胺的方法。 三聚氰胺从下面向上流入反应器，在反应器的下部与尿素熔体和可选的NH 3混合，从下方引入反应器，并从中心管中出来 中央管道的上部。 形成的三聚氰胺的一部分在中心管和反应器壁之间的环形空间中向下流动，其余部分被排出以进一步后处理。 在反应器的顶部除去废气。 还提供了用于实施该方法的反应器。
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公开(公告)号：US20050038244A1
公开(公告)日：2005-02-17
申请号：US10953021
申请日：2004-09-28
IPC分类号： C07D251/60 , F28D7/00
CPC分类号： C07D251/60 , B01J3/04 , B01J4/002 , B01J4/005 , B01J10/005 , B01J19/006 , B01J19/246 , B01J2219/00078
摘要： A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.
摘要翻译： 提供了一种通过在具有垂直中心管的高压反应器中热解尿素来生产三聚氰胺的方法。 三聚氰胺从下面向上流入反应器，在反应器的下部与尿素熔体和可选的NH 3混合，从下方引入反应器，并从中心管的上部的中心管排出。 形成的三聚氰胺的一部分在中心管和反应器壁之间的环形空间中向下流动，其余部分被排出以进一步后处理。 在反应器的顶部除去废气。 还提供了用于实施该方法的反应器。
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公开(公告)号：US06815545B2
公开(公告)日：2004-11-09
申请号：US10399637
申请日：2003-10-07
IPC分类号： C07D25160
CPC分类号： C07D251/60 , B01J3/04 , B01J4/002 , B01J4/005 , B01J10/005 , B01J19/006 , B01J19/246 , B01J2219/00078
摘要： A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.
摘要翻译： 提供了一种通过在具有垂直中心管的高压反应器中热解尿素来生产三聚氰胺的方法。 三聚氰胺从下面向上流入反应器，在反应器的下部与尿素熔体和可选的NH 3混合，从下方引入反应器，并从中心管的上部的中心管排出。 形成的三聚氰胺的一部分在中心管和反应器壁之间的环形空间中向下流动，其余部分被排出以进一步后处理。 在反应器的顶部除去废气。 还提供了用于实施该方法的反应器。
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