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公开(公告)号：US20050119483A1
公开(公告)日：2005-06-02
申请号：US10498532
申请日：2002-12-10
申请人： Gerhard Coufal
发明人： Gerhard Coufal
IPC分类号： C07D251/62 , C07D251/60
CPC分类号： C07D251/62
摘要： The invention relates to a method for producing pure melamine in a high-pressure method. According to said method, in the first stage, the melamine melt is brought into contact with hot NH3 and NH3 from the second stage and in the second step is brought into contact with cold NH3 in such a way that it is cooled to a temperature, which is 1-30° C. above the pressure-dependent melting point of the melamine, before being optionally rested in a third stage and subsequently treated in various ways.
摘要翻译： 本发明涉及一种高压法生产纯三聚氰胺的方法。 根据所述方法，在第一阶段中，三聚氰胺熔体与第二阶段的热NH 3和NH 3 3接触，在第二步中 与冷NH 3接触，使其在任选地放置在第三个中间之前被冷却到比三聚氰胺的压力依赖性熔点高1-30℃的温度 然后以各种方式进行治疗。
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公开(公告)号：US20050056147A1
公开(公告)日：2005-03-17
申请号：US10495310
申请日：2002-11-14
CPC分类号： C07D251/62 , B01D53/1487 , B01D53/1493 , B01D53/54
摘要： A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH3. In the second stage, the off-gases are contacted with a fresh urea melt.
摘要翻译： 提供了一个两级方法来净化高压三聚氰胺厂的废气。 在第一阶段，废气与含有三聚氰胺前体和NH 3的再循环尿素熔体接触。 在第二阶段，废气与新鲜的尿素熔体接触。
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公开(公告)号：US06603001B1
公开(公告)日：2003-08-05
申请号：US09913465
申请日：2001-08-30
申请人： Gerhard Coufal
发明人： Gerhard Coufal
IPC分类号： C07D25162
CPC分类号： C07D251/62
摘要： The invention relates to a method for producing solid melamine by expanding liquid, ammoniacal melamine which is mixed with excess ammonia, whereby a dispersion is produced. Said dispersion is expanded, optionally after it has been held under ammonia pressure, whereby solid melamine is deposited. The solid melamine is optionally held under ammonia pressure. Expansion is then optionally carried out in any particular order, along with cooling to room temperature and the pure melamine is isolated.
摘要翻译： 本发明涉及通过膨胀液体产生固体三聚氰胺的方法，其与过量氨混合的氨三聚氰胺，从而产生分散体。 所述分散体可以任选地在氨压力保持之后膨胀，从而沉积固体三聚氰胺。 固体三聚氰胺任选地保持在氨压力下。 然后任选地以任何特定的顺序进行膨胀，同时冷却至室温，并分离纯三聚氰胺。
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公开(公告)号：US06586629B1
公开(公告)日：2003-07-01
申请号：US09856193
申请日：2001-05-18
申请人： Gerhard Coufal
发明人： Gerhard Coufal
IPC分类号： C07C27304
CPC分类号： C07C273/12
摘要： The invention relates to a method for producing urea. According to said method, the off-gases which originate from a melamine plant and essentially consist of NH3 and CO2 are introduced into the high-pressure zone of the urea plant by means of ejectors.
摘要翻译： 本发明涉及一种生产尿素的方法。 根据所述方法，源自三聚氰胺装置并且基本上由NH 3和CO 2组成的废气通过喷射器被引入尿素装置的高压区。
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公开(公告)号：US06380385B1
公开(公告)日：2002-04-30
申请号：US09839199
申请日：2001-08-13
申请人： Lorenzo Canzi , Gerhard Coufal , Martin Müllner
发明人： Lorenzo Canzi , Gerhard Coufal , Martin Müllner
IPC分类号： C07D25162
CPC分类号： C07D251/60 , C07D251/62
摘要： A process for the preparation of pure melamine, in which liquid, ammonia-containing melamine is rapidly depressurized from an ammonia partial pressure p1 between 400 and 50 bar to an ammonia partial pressure p2 between 200 bar and atmospheric pressure, where p1 is always greater than p2, at a temperature which is 0 to 60° C. higher than the melamine solidification point dependent oil the particular prevailing ammonia partial pressure, higher pressures permitting a greater temperature interval from the melamine solidification point than lower pressures, by which means pure melamine separates out in solid form, whereupon, in any sequence, the product is further depressurized if appropriate to atmospheric pressure, cooled to room temperature and the pure melamine is isolated.
摘要翻译： 一种制备纯三聚氰胺的方法，其中液体，含氨的三聚氰胺从400巴和50巴之间的氨分压p1快速减压至200巴和大气压之间的氨分压p2，其中p1总是大于 p2，在比三聚氰胺凝固点依赖性油高于特定的主要氨分压的0至60℃的温度下，较高的压力允许从三聚氰胺凝固点起的温度比较低的压力更高，这意味着纯三聚氰胺分离 以固体形式，因此按任何顺序，如果适合于大气压，将产物进一步减压，冷却至室温，并分离纯三聚氰胺。
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公开(公告)号：US07311759B2
公开(公告)日：2007-12-25
申请号：US10495310
申请日：2002-11-14
IPC分类号： C07D251/60 , C07D251/62 , C07D55/24 , B01D47/00 , B01D53/14 , C07F3/00 , C08G79/00
CPC分类号： C07D251/62 , B01D53/1487 , B01D53/1493 , B01D53/54
摘要： A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH3. In the second stage, the off-gases are contacted with a fresh urea melt.
摘要翻译： 提供了一个两级方法来净化高压三聚氰胺厂的废气。 在第一阶段，废气与含有三聚氰胺前体和NH 3的再循环的尿素熔体接触。 在第二阶段，废气与新鲜的尿素熔体接触。
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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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公开(公告)号：US06790956B1
公开(公告)日：2004-09-14
申请号：US09830074
申请日：2001-04-23
申请人： Gerhard Coufal
发明人： Gerhard Coufal
IPC分类号： C07D25162
CPC分类号： C07D251/60 , C07D251/62
摘要： The invention relates to a method for producing pure melamine. According to this method, the melamine melt, which is produced from urea in a high-pressure process, is cooled and ammonia is added until it reaches a temperature of approximately 1 to 50° C. above the melting temperature of the melamine as dependent on the respective pressure of ammonia and then either a) quenched with water or an aqueous solution or suspension containing ammonia and/or melamine so that the melamine solidifies or b) quenched with cold liquid or gaseous ammonia, so that the melamine solidifies, the melamine then being cooled further with water or an aqueous solution or suspension containing ammonia and/or melamine and c) the melamine is then isolated.
摘要翻译： 本发明涉及一种生产纯三聚氰胺的方法。 根据该方法，将由高压法制成的三聚氰胺熔体冷却，加入氨，直至达到高于三聚氰胺的熔融温度约1〜50℃的温度，依赖于 氨的相应压力，然后a）用水或含有氨和/或三聚氰胺的水溶液或悬浮液淬灭，使得三聚氰胺固化或b）用冷液体或气态氨淬灭，以使三聚氰胺固化，然后将三聚氰胺固化 用水或含有氨和/或三聚氰胺的水溶液或悬浮液进一步冷却，然后分离三聚氰胺。
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公开(公告)号：US06870051B2
公开(公告)日：2005-03-22
申请号：US10416064
申请日：2001-11-02
申请人： Gerhard Coufal
发明人： Gerhard Coufal
IPC分类号： C01C1/02 , C07D251/60 , C07D251/62
CPC分类号： C01C1/024 , C07D251/60 , C07D251/62
摘要： A process for purifying gaseous melamine containing ammonia is provided. The method comprises partly condensing the gaseous melamine-containing ammonia to form melamine in liquid NH3 and purified NH3 gas. The melamine and purified NH3 gas are taken off.
摘要翻译： 提供了一种用于净化含有氨的气态三聚氰胺的方法。 该方法包括部分冷凝含气态三聚氰胺的氨以在液体NH 3和纯化的NH 3气体中形成三聚氰胺。 取出三聚氰胺和纯化的NH 3气体。
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