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11. 发明授权

US08263805B2 Process and plant for urea production 有权
公开(公告)号：US08263805B2
公开(公告)日：2012-09-11
申请号：US12679827
申请日：2007-10-04
申请人： Federico Zardi , Sergio Debernardi
发明人： Federico Zardi , Sergio Debernardi
IPC分类号： C07C273/04
摘要： A process for producing urea is disclosed, wherein liquid ammonia and carbon dioxide are reacted in a high-pressure synthesis section (100), and at least part of the carbon dioxide is fed to said synthesis section (100) in liquid phase. A plant operating according to said process and a method for modernizing existing plants accordingly are also disclosed.

12. 发明授权

US07674933B2 Method for modernizing a urea production plant 有权
标题翻译：尿素生产设备现代化的方法
公开(公告)号：US07674933B2
公开(公告)日：2010-03-09
申请号：US12051529
申请日：2008-03-19
申请人： Federico Zardi
发明人： Federico Zardi
IPC分类号： C07C273/04 , B01J10/02 , F28D7/00
CPC分类号： C07C273/04 , B01J2219/00006 , Y02P20/142 , Y02P20/582
摘要： A method for modernizing a urea production plant including a urea synthesis reactor, a stripping unit and at least one condensation unit. The method includes providing: means in the condensation unit for substantially condensing at least a portion of a flow comprising ammonia and carbon dioxide in vapor phase leaving the stripping unit; a second stripping unit; means for feeding a first portion of a reaction mixture flow comprising urea, carbamate and free ammonia in aqueous solution leaving the reactor to the first stripping unit; means for feeding a second portion of the reaction mixture flow leaving the reactor to the second stripping unit; and means for feeding at least a portion of a flow comprising ammonia and carbon dioxide in vapor phase leaving the second stripping unit directly to the synthesis reactor. A de-bottlenecking of the high-pressure section downstream of the synthesis reactor may be achieved, improving production capacity.
摘要翻译：一种使尿素生产设备现代化的方法，包括尿素合成反应器，汽提单元和至少一个冷凝单元。该方法包括提供：在冷凝单元中的装置，用于基本上冷凝包含氨和二氧化碳的气流的至少一部分，离开汽提单元; 第二剥离单元; 用于将含有尿素，氨基甲酸酯和游离氨的反应混合物流的第一部分进料到水溶液中以使反应器进入第一汽提单元的装置; 用于将离开反应器的反应混合物流的第二部分进料到第二汽提单元的装置; 以及用于在汽相中进料至少一部分包含氨和二氧化碳的流的装置，其将第二汽提单元直接送入合成反应器。可以实现合成反应器下游的高压段的脱瓶颈，提高生产能力。

13. 发明申请

US20090292140A1 Method for the Modernization of a Urea Production Plant 有权
标题翻译：尿素生产厂现代化的方法
公开(公告)号：US20090292140A1
公开(公告)日：2009-11-26
申请号：US12464518
申请日：2009-05-12
申请人： Federico Zardi , Andrea Scotto
发明人： Federico Zardi , Andrea Scotto
IPC分类号： C07C273/04 , B01J10/00 , B01J19/00
CPC分类号： C07C273/04 , B01J2219/00024
摘要： A method for revamping a conventional self-stripping urea plant is disclosed, where a minor portion (18a) of the carbon dioxide feed is fed to the stripper (7) and used as a stripping agent. In further embodiments, another carbamate condenser is installed, or the conventional horizontal shell-and-tube carbamate condenser (6) is replaced with a vertical submerged unit.
摘要翻译：公开了一种用于改进常规自剥式尿素装置的方法，其中将二氧化碳进料的少部分（18a）进料到汽提器（7）并用作汽提剂。在另外的实施方案中，安装了另一种氨基甲酸酯冷凝器，或者将常规的水平管壳氨基甲酸酯冷凝器（6）替换为垂直浸没的单元。

14. 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）。

15. 发明授权

US07091379B2 Process and plant for the production of urea 有权
标题翻译：生产尿素的工艺和设备
公开(公告)号：US07091379B2
公开(公告)日：2006-08-15
申请号：US10513189
申请日：2004-01-15
申请人： Federico Zardi
发明人： Federico Zardi
IPC分类号： C07C273/04 , B01J8/04
CPC分类号： C07C273/04
摘要： A process for urea production comprises the steps of:—performing a reaction between ammonia and carbon dioxide in a reaction space to obtain a reaction mixture comprising urea, carbamate and free ammonia in aqueous solution,—subjecting said mixture to a stripping treatment with carbon dioxide feed as a stripping agent to obtain a first flow comprising ammonia and carbon dioxide in vapor phase and a flow comprising urea and residual carbamate in aqueous solution,—feeding said flow comprising urea and residual carbamate in aqueoue solution to a urea recovery section,—separating in said recovery section said residual carbamate from the urea to obtain a first flow of carbamate in aqueous solution.
摘要翻译：一种用于生产尿素的方法包括以下步骤： - 在反应空间中实施氨和二氧化碳之间的反应，以获得包含尿素，氨基甲酸酯和游离氨在水溶液中的反应混合物， - 将所述混合物喷射到二氧化碳的汽提处理进料作为汽提剂以获得包含气相中的氨和二氧化碳的第一流，以及包含尿素和残留的氨基甲酸酯在水溶液中的流动，将包含脲和氨基甲酸酯的残留氨基甲酸酯在阿克斯溶液中进料到尿素回收段，分离在所述回收部分中，所述残余的氨基甲酸酯从尿素中获得在水溶液中的氨基甲酸酯的第一流。

16. 发明授权

US6120740A Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature 有权
公开(公告)号：US6120740A
公开(公告)日：2000-09-19
申请号：US226909
申请日：1999-01-05
申请人： Federico Zardi , Paolo Silva
发明人： Federico Zardi , Paolo Silva
IPC分类号： B01D3/22 , B01J3/04 , B01J10/00 , B01J19/00 , C07C273/04 , B01J8/04
CPC分类号： C07C273/04 , B01D3/22 , B01J10/002 , B01J19/006 , B01J3/04 , B01J2219/00024 , B01J2219/00777 , B01J2219/185 , B01J2219/1943 , Y02P20/142 , Y02P20/582
摘要： A reactor for two-phase reaction, in particular for urea synthesis at high pressure and temperature of the type wherein a co-current flow of a gaseous phase and a liquid phase takes place, comprises a substantially cylindrical vertical external shell (2) in which is supported a plurality of superimposed horizontal perforated plates (6a-6e) in mutually spaced relationship and at least one opening (12a-12e) for liquid flow being defined in correspondence of each of the perforated plates. Advantageously the openings (12a-12e) for liquid flow are mutually offset so as to obtain a substantially zigzag preferential flow path for the liquid phase in the reactor.

17. 发明授权

US08158823B2 Method for the modernization of a urea production plant 有权
标题翻译：尿素生产设备现代化的方法
公开(公告)号：US08158823B2
公开(公告)日：2012-04-17
申请号：US12464518
申请日：2009-05-12
申请人： Federico Zardi , Andrea Scotto
发明人： Federico Zardi , Andrea Scotto
IPC分类号： C07C273/00
CPC分类号： C07C273/04 , B01J2219/00024
摘要： A method for revamping a conventional self-stripping urea plant is disclosed, where a minor portion (18a) of the carbon dioxide feed is fed to the stripper (7) and used as a stripping agent. In further embodiments, another carbamate condenser is installed, or the conventional horizontal shell-and-tube carbamate condenser (6) is replaced with a vertical submerged unit.
摘要翻译：公开了一种用于改进常规自剥式尿素装置的方法，其中将二氧化碳进料的少部分（18a）进料到汽提器（7）并用作汽提剂。在另外的实施方案中，安装了另一种氨基甲酸酯冷凝器，或者将常规的水平管壳氨基甲酸酯冷凝器（6）替换为垂直浸没的单元。

18. 发明授权

US08129565B2 High-pressure loop in a process for synthesis of urea 有权
标题翻译：尿素合成过程中的高压回路
公开(公告)号：US08129565B2
公开(公告)日：2012-03-06
申请号：US13140286
申请日：2009-11-17
申请人： Federico Zardi , Andrea Scotto
发明人： Federico Zardi , Andrea Scotto
IPC分类号： C07C273/04
CPC分类号： C07C273/04 , B01D19/0015 , B01J2219/00006 , B01J2219/00024 , B01J2219/00108 , Y02P20/142
摘要： A process and a related plant layout for producing urea are disclosed, wherein the high-pressure loop (1) comprises a synthesis reactor (2), a thermal stripper (3), a condenser (4), and an adiabatic CO2 stripper (10) disposed upstream said thermal stripper, separating a vapour phase (13) containing ammonia from the urea solution (9) discharged from the reactor, and recycling said vapour phase to the reactor. The adiabatic stripper (10) can be incorporated in a reactor (200) having a top reaction zone and a bottom adiabatic stripping zone. A revamping method for a conventional urea plant in accordance with the inventive process is also disclosed.
摘要翻译：公开了一种用于生产尿素的方法和相关工厂布局，其中高压回路（1）包括合成反应器（2），热汽提器（3），冷凝器（4）和绝热CO 2汽提器（10 ），设置在所述热汽提器的上游，从从反应器排出的尿素溶液（9）中分离含有氨的气相（13），并将所述气相再循环到反应器。绝热汽提塔（10）可以结合在具有顶部反应区和底部绝热汽提区的反应器（200）中。还公开了根据本发明方法的常规尿素装置的改进方法。

19. 发明授权

US07982068B2 Process for urea production and related plant 有权
标题翻译：尿素生产工艺及相关工厂
公开(公告)号：US07982068B2
公开(公告)日：2011-07-19
申请号：US12513487
申请日：2007-10-09
申请人： Federico Zardi , Paolo Brunengo , Paolo Sticchi
发明人： Federico Zardi , Paolo Brunengo , Paolo Sticchi
IPC分类号： C07C273/16 , C07C273/04
CPC分类号： C07C273/04
摘要： A process for urea production from ammonia and carbon dioxide, in which part of the aqueous solution comprising urea, ammonium carbamate and ammonia obtained in a urea synthesis section is subjected to dissociation in a treatment section operating at a predetermined medium pressure for the recovery of the ammonium carbamate and of the ammonia contained in it, comprises the steps of subjecting the urea aqueous solution resulting from the aforementioned dissociation step to decomposition in a low pressure urea recovery section and of using at least a part of the condensed steam, obtained by indirect thermal exchange with a second part of said aqueous solution comprising urea, ammonium carbmate and ammonia in a high-pressure stripping unit, as a heating fluid for the dissociation of the first part of the aqueous solution comprising urea, ammonium carbmate and ammonia in the medium-pressure treatment section.
摘要翻译：一种由氨和二氧化碳生产尿素的方法，其中在尿素合成段中得到的包含尿素，氨基甲酸铵和氨水的部分水溶液在预定介质压力下操作的处理段中解离，以回收氨基甲酸铵和其中所含的氨的方法包括以下步骤：将由上述解离步骤产生的尿素水溶液在低压尿素回收段中分解并使用至少一部分冷凝蒸汽，通过间接热在包含尿素，氨基甲酸铵和氨的第二部分的高压汽提装置中与第二部分水溶液交换，所述加热流体用于在介质中包含尿素，氨基甲酸铵和氨的水溶液的第一部分的解离，压力处理部。

20. 发明申请

US20110124495A1 PROCESS AND PLANT FOR THE PRODUCTION OF A UREA SOLUTION FOR USE IN SCR PROCESS FOR REDUCTION OF NOX 审中-公开
标题翻译：用于生产用于减少NOX的SCR过程中的尿素溶液的方法和设备
公开(公告)号：US20110124495A1
公开(公告)日：2011-05-26
申请号：US13054956
申请日：2009-07-21
申请人： Federico Zardi
发明人： Federico Zardi
IPC分类号： B01J31/00 , B01J14/00
CPC分类号： B01J31/0249 , B01D2251/2067 , B01D2257/404 , C07C273/16
摘要： A process and a plant for the preparation of an acqueous solution of urea suitable for use in a SCR process for nitrogen oxides removal, wherein the urea solution from the recovery section of a urea plant is subject to at least one step of evaporation, separating a vapour stream containing water and ammonia, and obtaining a concentrated and substantially ammonia-free solution, and said concentrated solution is diluted to the concentration of urea suitable for use in the SCR process.
摘要翻译：一种用于制备适于用于氮氧化物去除的SCR方法的尿素水溶液的方法和设备，其中来自脲厂的回收部分的尿素溶液经受至少一个蒸发步骤，分离含有水和氨的蒸汽流，并获得浓缩且基本上不含氨的溶液，将所述浓缩溶液稀释至适合用于SCR工艺的尿素浓度。

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