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31. 发明授权

US09815800B2 Integrated production of urea and melamine 有权
公开(公告)号：US09815800B2
公开(公告)日：2017-11-14
申请号：US15106140
申请日：2014-12-16
申请人： Stamicarbon B.V.
发明人： Johannes Henricus Mennen
IPC分类号： C07D251/60 , C07D251/62 , C07C273/12 , B01J19/24 , B01J3/04 , B01J4/00 , B01J10/00
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.

32. 发明申请

US20170081297A1 PROCESS AND PLANT FOR THE SYNTHESIS OF UREA AND MELAMINE 有权
公开(公告)号：US20170081297A1
公开(公告)日：2017-03-23
申请号：US15126212
申请日：2015-04-16
申请人： Casale SA
发明人： Paolo Bertini , Gabriele DI CARLO
IPC分类号： C07D251/60 , C07C273/12
CPC分类号： C07D251/60 , B01J3/04 , B01J4/02 , B01J10/00 , B01J19/24 , C07C273/12 , Y02P20/125
摘要： An integrated process for the synthesis of urea and melamine, wherein: urea is synthesized with a stripping process in a high-pressure synthesis loop comprising a reactor, a stripper and a carbamate condenser, and the urea solution leaving said stripper is sent to a recovery section to produce a concentrated urea product and a recovered carbamate solution; at least part of said urea product is converted to melamine, and the off-gas from the synthesis of melamine are recycled to the urea synthesis by mixing with the gas phase from the stripper and with said recovered carbamate solution, thus forming a mixed flow which is then condensed in said carbamate condenser, and the condensate is eventually directed to the reactor.

33. 发明授权

US07893298B2 Method for concentrating an aqueous ammonium carbamate stream 有权
标题翻译：浓缩氨基甲酸铵水溶液流的方法
公开(公告)号：US07893298B2
公开(公告)日：2011-02-22
申请号：US11919991
申请日：2006-05-15
申请人： Johannes Henricus J. H. Mennen , Tjay Tjien T. T. Tjioe
发明人： Johannes Henricus J. H. Mennen , Tjay Tjien T. T. Tjioe
IPC分类号： C07C269/00 , C07C51/15
CPC分类号： C07C273/12
摘要： The invention relates to a method for concentrating an aqueous ammonium carbamate stream, which has been formed in a process for the preparation of urea, has a pressure between 0.20 MPa and 0.9 MPa, a temperature between 35° C. and 95° C., and contains at least 25 wt. % H2O, comprising: a pressure increase step, in which the aqueous ammonium carbamate stream is increased in pressure to a pressure between 1.0 MPa and 7 MPa; a condensation step, in which the aqueous ammonium carbamate stream is contacted with a gas stream, which has been formed in a process for the preparation of melamine and which consists essentially of NH3, CO2 and optionally H2O and has a lower H2O content than the aqueous ammonium carbamate stream, the gas stream being absorbed in the aqueous ammonium carbamate stream in such a way that a concentrated ammonium carbamate stream is formed that contains between 15 and 35 wt. % H2O; a discharge step, in which the concentrated ammonium carbamate stream is separated and discharged.
摘要翻译：本发明涉及一种浓缩在制备尿素的方法中形成的氨基甲酸铵水溶液流的方法，其压力在0.20MPa和0.9MPa之间，温度在35℃和95℃之间，并含有至少25wt。％H 2 O，包括：加压步骤，其中氨基甲酸铵水溶液流的压力升高至1.0MPa和7MPa之间的压力; 缩合步骤，其中氨基甲酸铵水溶液流与气流形成接触，气流在制备三聚氰胺的方法中形成，其基本上由NH 3，CO 2和任选的H 2 O组成，并且具有比水的更低的H 2 O含量氨基甲酸铵流，气流被吸收在氨基甲酸铵水溶液流中，使得形成含有15至35重量％的氨基甲酸铵浓缩物流。％H2O; 排出步骤，其中浓氨基甲酸铵流分离和排出。

34. 发明申请

US20090069597A1 Method for concentrating an aqueous ammonium carbamate stream 有权
标题翻译：浓缩氨基甲酸铵水溶液流的方法
公开(公告)号：US20090069597A1
公开(公告)日：2009-03-12
申请号：US11919991
申请日：2006-05-15
申请人： Johannes Henricus J.H. Mennen , Tjay Tjien T.T Tjioe
发明人： Johannes Henricus J.H. Mennen , Tjay Tjien T.T Tjioe
IPC分类号： C07C269/00 , B01D3/00
CPC分类号： C07C273/12
摘要： The invention relates to a method for concentrating an aqueous ammonium carbamate stream, which has been formed in a process for the preparation of urea, has a pressure between 0.20 MPa and 0.9 MPa, a temperature between 35° C. and 95° C., and contains at least 25 wt. % H2O, comprising: a pressure increase step, in which the aqueous ammonium carbamate stream is increased in pressure to a pressure between 1.0 MPa and 7 MPa; a condensation step, in which the aqueous ammonium carbamate stream is contacted with a gas stream, which has been formed in a process for the preparation of melamine and which consists essentially of NH3, CO2 and optionally H2O and has a lower H2O content than the aqueous ammonium carbamate stream, the gas stream being absorbed in the aqueous ammonium carbamate stream in such a way that a concentrated ammonium carbamate stream is formed that contains between 15 and 35 wt. % H2O; a discharge step, in which the concentrated ammonium carbamate stream is separated and discharged.
摘要翻译：本发明涉及一种浓缩在制备尿素的方法中形成的氨基甲酸铵水溶液流的方法，其压力在0.20MPa和0.9MPa之间，温度在35℃和95℃之间，并含有至少25wt。％H 2 O，包括：加压步骤，其中氨基甲酸铵水溶液流的压力升高至1.0MPa和7MPa之间的压力; 缩合步骤，其中氨基甲酸铵水溶液流与气流形成接触，气流在制备三聚氰胺的方法中形成，其基本上由NH 3，CO 2和任选的H 2 O组成，并且具有比水的更低的H 2 O含量氨基甲酸铵流，气流被吸收在氨基甲酸铵水溶液流中，使得形成含有15至35重量％的氨基甲酸铵浓缩物流。％H2O; 排出步骤，其中浓氨基甲酸铵流分离和排出。

35. 发明申请

US20070282102A1 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：US20070282102A1
公开(公告)日：2007-12-06
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： C07C273/12 , B01J19/24 , 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）。

36. 发明申请

US20050288529A1 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：US20050288529A1
公开(公告)日：2005-12-29
申请号：US10522560
申请日：2003-07-10
申请人： Tjay Tjioe , Josef Meessen
发明人： Tjay Tjioe , Josef Meessen
IPC分类号： C07C273/12 , C07C273/04
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。

37. 发明授权

US06344588B1 Process for the preparation of urea 有权
标题翻译：制备尿素的方法
公开(公告)号：US06344588B1
公开(公告)日：2002-02-05
申请号：US09607325
申请日：2000-06-30
申请人： Julius G. T. Van Wijck
发明人： Julius G. T. Van Wijck
IPC分类号： C07C27304
CPC分类号： C07D251/60 , C07C273/12 , Y02P20/582
摘要： In the present process for the preparation of urea, an off-gas stream released during the synthesis of melamine in a high-pressure melamine process which consists predominantly of ammonia and carbon dioxide, is introduced into at least one high-pressure section of a urea stripping plant and is used in the synthesis of urea. The off-gas stream can be used directly without any further treatment.
摘要翻译：在制备尿素的本方法中，在主要由氨和二氧化碳组成的高压三聚氰胺方法中合成三聚氰胺期间释放的废气流被引入至少一个尿素高压段汽提厂，用于合成尿素。废气流可以直接使用，无需任何进一步的处理。

38. 发明授权

US3239522A Synthesis of urea and melamine 失效
标题翻译：脲和三聚氰胺的合成
公开(公告)号：US3239522A
公开(公告)日：1966-03-08
申请号：US26463763
申请日：1963-03-12
申请人： CHEMICAL CONSTRUCTION CORP
发明人： COOK LUCIEN H , IVO MAVROVIC
IPC分类号： C07C273/12
CPC分类号： C07C273/12

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