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1. 发明申请

US20110009630A1 PROCESS FOR THE PREPARATION OF MELAMINE 审中-公开
标题翻译：制备MELAMINE的方法
公开(公告)号：US20110009630A1
公开(公告)日：2011-01-13
申请号：US12809303
申请日：2008-11-27
申请人： Tjay Tjien Tjioe
发明人： Tjay Tjien Tjioe
IPC分类号： C07D251/60
CPC分类号： C07D251/60 , C07C273/12
摘要： The present invention relates to a non-catalytic process for the preparation of melamine comprising: a) reacting molten urea in a reaction section at a pressure of 4.5 to 15 MPa to produce a reaction mixture containing molten melamine and reaction off-gases; b) vaporizing the molten melamine in said reaction mixture in a vaporization section to produce a gaseous mixture comprising the vaporized melamine and the reaction off-gases at a pressure of 4.5 to 15 MPa; c) quenching the gaseous mixture obtained from step b) by contact with an aqueous ammonium carbamate solution; and d) isolating melamine; and to a combined process for the preparation of urea and melamine, wherein melamine is prepared in accordance to the above method wherein at least part of the concentrated aqueous ammonium carbamate solution is transferred to an urea plant as at least part of the feed stock, urea is prepared utilizing said concentrated aqueous carbamate solution and urea obtained from said preparation step is supplied in molten form to the reacting step a).
摘要翻译：本发明涉及一种用于制备三聚氰胺的非催化方法，其包括：a）使反应段中的熔融脲在4.5至15MPa的压力下反应以产生含有熔融三聚氰胺和反应废气的反应混合物; b）在蒸发部分中蒸发所述反应混合物中的熔融三聚氰胺，以在4.5至15MPa的压力下产生包含蒸发的三聚氰胺和反应废气的气态混合物; c）通过与氨基甲酸铵水溶液接触淬灭从步骤b）获得的气体混合物; 和d）分离三聚氰胺; 以及用于制备尿素和三聚氰胺的组合方法，其中根据上述方法制备三聚氰胺，其中至少部分浓氨基甲酸铵水溶液作为原料的至少一部分转移到脲装置，尿素使用所述浓缩的氨基甲酸铵水溶液制备，并且将从所述制备步骤获得的脲以熔融形式供应到反应步骤a）。

2. 发明申请

US20070032650A1 Integrated process for urea and melamine production 审中-公开
标题翻译：尿素和三聚氰胺生产的综合过程
公开(公告)号：US20070032650A1
公开(公告)日：2007-02-08
申请号：US10595349
申请日：2004-08-10
申请人： Paolo Brunengo , Federico Zardi
发明人： Paolo Brunengo , Federico Zardi
IPC分类号： C07D251/60 , C07C273/12
CPC分类号： C07D251/60 , B01J2219/00006 , B01J2219/00092 , B01J2219/00103 , C07C273/12 , Y02P20/125 , Y02P20/582
摘要： In an integrated process for urea and melamine production, urea is produced in a urea plant (12) comprising a high pressure urea synthesis section (15) and a urea recovery section (16) for separating urea from a carbamate aqueous solution, and melamine is produced in a melamine plant (11) wherein off-gases resulting as byproducts of the melamine synthesis are discharged therefrom at a pressure of at least 2 bar and recycled to the high pressure urea synthesis section (15).
摘要翻译：在尿素和三聚氰胺生产的综合方法中，尿素在尿素装置（12）中生产，尿素装置（12）包括高压尿素合成段（15）和用于从氨基甲酸酯水溶液中分离尿素的尿素回收段（16），三聚氰胺是在三聚氰胺植物（11）中生产，其中作为三聚氰胺合成的副产物产生的废气在至少2巴的压力下从其中排出并再循环到高压尿素合成段（15）。

3. 发明授权

US07094927B2 Process for increasing the capacity of a urea plant 有权
标题翻译：提高尿素装置容量的方法
公开(公告)号：US07094927B2
公开(公告)日：2006-08-22
申请号：US10522560
申请日：2003-07-10
申请人： Tjay Tjien Tjioe , Jozef Hubert Meessen
发明人： Tjay Tjien Tjioe , Jozef Hubert Meessen
IPC分类号： C07C273/12 , C07C273/04 , C07D251/60
CPC分类号： C07C273/12
摘要： Process for increasing the capacity of a urea plant comprising a compression section, a high-pressure synthesis section, a urea recovery section, in which a urea melt is formed, and optionally a granulation section, the capacity of the urea plant being increased by the additional installation of a melamine plant and the urea melt from the urea recovery section of the urea plant being fed wholly or partly to the melamine plant and the residual gases from the melamine plant being returned wholly or partly to the high-pressure synthesis section and/or the urea recovery section of the urea plant.
摘要翻译：增加尿素装置的容量的方法包括压缩部分，高压合成部分，其中形成尿素熔体的尿素回收部分和任选的造粒部分，尿素装置的容量增加三聚氰胺装置的附加装置和来自全部或部分供给三聚氰胺装置的尿素装置的尿素回收部分的尿素熔体和来自三聚氰胺装置的残余气体全部或部分返回到高压合成段和/ 或尿素装置的尿素回收部。

4. 发明申请

US20060052637A1 INTEGRATED PROCESS FOR UREA/MELAMINE PRODUCTION AND RELATED PLANT 有权
标题翻译：尿素/梅毒生产综合工艺及相关工厂
公开(公告)号：US20060052637A1
公开(公告)日：2006-03-09
申请号：US11179691
申请日：2005-07-11
申请人： Lino Porro
发明人： Lino Porro
IPC分类号： C07C273/02
CPC分类号： C07C273/12 , Y02P20/125
摘要： An integrated process for urea/melamine production. In the process, urea is synthesized from ammonia and carbon dioxide, obtaining molten urea and a gaseous mixture comprising steam and ammonia. The gaseous mixture is condensed, obtaining a cold aqueous ammoniacal solution. Melamine is synthesized from urea with formation of off-gases, comprising ammonia and carbon dioxide. The off-gases are absorbed in at least one fraction of the cold aqueous ammonical solution, with formation of a carbamate aqueous solution. The carbamate aqueous solution is decomposed, obtaining ammonia, carbon dioxide and steam, and a residual aqueous ammoniacal solution. The ammonia and the carbon dioxide are recycled for the urea synthesis. The residual aqueous ammoniacal solution obtained is treated to recover ammonia and carbon dioxide for the urea synthesis.
摘要翻译：尿素/三聚氰胺生产的综合过程。在此过程中，尿素由氨和二氧化碳合成，得到熔融的尿素和包含蒸汽和氨的气态混合物。将气体混合物冷凝，得到冷的氨水溶液。三聚氰胺由尿素合成，形成废气，包括氨和二氧化碳。废气在至少一部分冷氨水溶液中吸收，形成氨基甲酸酯水溶液。氨基甲酸酯水溶液分解，得到氨，二氧化碳和蒸汽，以及残留的氨水溶液。氨和二氧化碳被再循环用于尿素合成。处理所得残余的氨水溶液以回收氨和二氧化碳用于尿素合成。

5. 发明授权

US07414130B2 Integrated process for urea and melamine production 有权
标题翻译：尿素和三聚氰胺生产的综合过程
公开(公告)号：US07414130B2
公开(公告)日：2008-08-19
申请号：US11777842
申请日：2007-07-13
申请人： Paolo Brunengo , Federico Zardi
发明人： Paolo Brunengo , Federico Zardi
IPC分类号： C07D251/60
CPC分类号： C07D251/60 , B01J2219/00006 , B01J2219/00092 , B01J2219/00103 , C07C273/12 , Y02P20/125 , Y02P20/582
摘要： In an integrated process for urea and melamine production, urea is produced in a urea plant (12) comprising a high pressure urea synthesis section (15) and a urea recovery section (16) for separating urea from a carbamate aqueous solution, and melamine is produced in a melamine plant (11) wherein off-gases resulting as byproducts of the melamine synthesis are discharged therefrom at a pressure of at least 2 bar and recycled to the high pressure urea synthesis section (15).
摘要翻译：在尿素和三聚氰胺生产的综合方法中，尿素在尿素装置（12）中生产，尿素装置（12）包括高压尿素合成段（15）和用于从氨基甲酸酯水溶液中分离尿素的尿素回收段（16），三聚氰胺是在三聚氰胺植物（11）中生产，其中作为三聚氰胺合成的副产物产生的废气在至少2巴的压力下从其中排出并再循环到高压尿素合成段（15）。

6. 发明授权

US07074958B2 Integrated process for urea/melamine production and related plant 有权
标题翻译：尿素/三聚氰胺生产及相关工厂的综合工艺
公开(公告)号：US07074958B2
公开(公告)日：2006-07-11
申请号：US11179691
申请日：2005-07-11
申请人： Lino Porro
发明人： Lino Porro
IPC分类号： C07C273/12 , B05L10/00 , C07D251/60
CPC分类号： C07C273/12 , Y02P20/125
摘要： An integrated process for urea/melamine production. In the process, urea is synthesized from ammonia and carbon dioxide, obtaining molten urea and a gaseous mixture comprising steam and ammonia. The gaseous mixture is condensed, obtaining a cold aqueous ammoniacal solution. Melamine is synthesized from urea with formation of off-gases, comprising ammonia and carbon dioxide. The off-gases are absorbed in at least one fraction of the cold aqueous ammonical solution, with formation of a carbamate aqueous solution. The carbamate aqueous solution is decomposed, obtaining ammonia, carbon dioxide and steam, and a residual aqueous ammoniacal solution. The ammonia and the carbon dioxide are recycled for the urea synthesis. The residual aqueous ammoniacal solution obtained is treated to recover ammonia and carbon dioxide for the urea synthesis.
摘要翻译：尿素/三聚氰胺生产的综合过程。在此过程中，尿素由氨和二氧化碳合成，得到熔融的尿素和包含蒸汽和氨的气态混合物。将气体混合物冷凝，得到冷的氨水溶液。三聚氰胺由尿素合成，形成废气，包括氨和二氧化碳。废气在至少一部分冷氨水溶液中吸收，形成氨基甲酸酯水溶液。氨基甲酸酯水溶液分解，得到氨，二氧化碳和蒸汽，以及残留的氨水溶液。氨和二氧化碳被再循环用于尿素合成。处理所得残余的氨水溶液以回收氨和二氧化碳用于尿素合成。

7. 发明授权

US06586629B1 Method of introducing melamine off-gases into a urea plant 失效
标题翻译：将三聚氰胺废气引入尿素厂的方法
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。

8. 发明授权

US3697521A Integrated process for the preparation of urea and melamine 失效
标题翻译：用于制备尿素和梅拉米的综合方法
公开(公告)号：US3697521A
公开(公告)日：1972-10-10
申请号：US3697521D
申请日：1970-12-15
申请人： STAMICARBON
发明人： NASSAU PETRUS J M VAN , BRAND WILHELMUS K , KAASENBROOD PETRUS J C
IPC分类号： C07D251/60 , C07C67/00 , C07C239/00 , C07C273/12 , C07D55/28
CPC分类号： C07C273/12 , Y02P20/125
摘要： An integrated process for the preparation of urea and melamine is described wherein heat requirements for the decomposition of ammonium carbamate contained in the urea product solution, which is cycled as feed to the melamine synthesis stage, is supplied, at least in part, from the heat released by the desublimation of the melamine vapors obtained in the melamine synthesis gas product stream, by bringing this gas stream into direct contact, either in counter-current or co-current flow, with the ammonium carbamate-containing urea product solution.
摘要翻译：描述了一种用于制备尿素和三聚氰胺的综合方法，其中包含在作为进料至三聚氰胺合成阶段的尿素产物溶液中的氨基甲酸铵分解的热需求至少部分地从热量通过在三聚氰胺合成气产物流中获得的三聚氰胺蒸汽的释放，通过使该气流以逆流或并流流动与含氨基甲酸铵的尿素产物溶液直接接触释放。

9. 发明授权

US09981924B2 Integrated production of urea and melamine 有权
公开(公告)号：US09981924B2
公开(公告)日：2018-05-29
申请号：US15692715
申请日：2017-08-31
申请人： Stamicarbon B.V.
发明人： Johannes Henricus Mennen
IPC分类号： C07D251/60 , C07D251/62 , C07C273/12 , B01J19/24
CPC分类号： C07D251/60 , B01J19/245 , B01J2219/00103 , B01J2219/24 , C07C273/12 , C07D251/62
摘要： Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off-gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.

10. 发明授权

US09522875B2 Method for treating offgases from a melamine plant 有权
标题翻译：用于处理来自三聚氰胺植物的废气的方法
公开(公告)号：US09522875B2
公开(公告)日：2016-12-20
申请号：US14005942
申请日：2012-03-22
申请人： Arne Schadt , Christoph Neumeuller
发明人： Arne Schadt , Christoph Neumeuller
IPC分类号： C07C273/02 , C07C273/12
CPC分类号： C07C273/02 , C07C273/12 , Y02P20/125
摘要： Disclosed is a method for treating or using offgases obtained in a melamine plant comprising at least one melamine synthesis reactor and at least one washing unit in an integrated process for urea and melamine production, wherein the offgases leaving the melamine synthesis reactor are fed into the washing section and the washed offgases leaving the washing section are transferred from the washing section via at least one pipeline connecting the washing section and the at least one urea synthesis plant to the at least one urea synthesis plant. The washed offgases leaving the washing section are mixed with at least one carbamate solution immediately downstream of the washing section by feeding the carbamate solution into the pipeline connecting the washing section to the urea plant.
摘要翻译：公开了一种用于处理或使用在三聚氰胺装置中获得的废气的方法，其包含至少一种三聚氰胺合成反应器和至少一个洗涤单元，其中尿素和三聚氰胺生产的一体化方法，其中离开三聚氰胺合成反应器的废气进料到洗涤离开洗涤部分的洗涤过的残余物通过连接洗涤部分和至少一个尿素合成设备的至少一个管道从洗涤部分转移到至少一个尿素合成设备。通过将氨基甲酸盐溶液送入将洗涤部分连接到尿素装置的管道中，离开洗涤部分的洗涤过的残余物与至少一个氨基甲酸酯溶液在洗涤部分的下游混合。

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