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1. 发明授权

US06827887B2 Method for obtaining urea prills 有权
标题翻译：获得尿素颗粒的方法
公开(公告)号：US06827887B2
公开(公告)日：2004-12-07
申请号：US09987078
申请日：2001-11-13
申请人： Federico Zardi , Domenico Romiti
发明人： Federico Zardi , Domenico Romiti
IPC分类号： B29B910
CPC分类号： B01J2/04 , C05C9/005 , F28F3/12 , F28F19/008
摘要： A method for obtaining urea prills in a prilling tower (1) comprising the step of making a plurality of melt urea droplets to fall from a urea melt distributing device (4) towards an urea prills collecting bottom (6) of the prilling tower, further comprises the step of cooling the collecting bottom (6).
摘要翻译：一种在造粒塔（1）中获得尿素颗粒的方法，包括使多个熔融尿素液滴从尿素熔体分配装置（4）向造粒塔的尿素颗粒收集底部（6）落下的步骤包括冷却收集底部（6）的步骤。

2. 发明授权

US06649795B2 Process for decomposing a carbamate aqueous solution coming from the urea recovery section of a urea production plant 有权
标题翻译：用于分解来自尿素生产设备的尿素回收部分的氨基甲酸酯水溶液的方法
公开(公告)号：US06649795B2
公开(公告)日：2003-11-18
申请号：US10049686
申请日：2002-02-15
申请人： Giorgio Pagani , Federico Zardi , Domenico Romiti
发明人： Giorgio Pagani , Federico Zardi , Domenico Romiti
IPC分类号： C07C27302
CPC分类号： C07C273/04 , Y02P20/582
摘要： In a process for decomposing a carbamate aqueous solution coming from a urea recovery section of a urea production plant at a predetermined temperature by indirect heat exchange with a heating fluid having a different predetermined temperature, the temperature difference between said carbamate aqueous solution and said heating fluid is reduced to a value not higher than 70° C.
摘要翻译：在通过与具有不同的预定温度的加热流体进行间接热交换在预定温度下分解来自尿素生产设备的尿素回收部分的氨基甲酸酯水溶液的方法中，所述氨基甲酸盐水溶液与所述加热流体之间的温差降至不高于70℃的值。

3. 发明授权

US06552224B2 Process and plant for the production of urea 有权
公开(公告)号：US06552224B2
公开(公告)日：2003-04-22
申请号：US10049687
申请日：2002-05-16
申请人： Giorgio Pagani , Federico Zardi , Domenico Romiti
发明人： Giorgio Pagani , Federico Zardi , Domenico Romiti
IPC分类号： C07C27304
CPC分类号： C07C273/04 , Y02P20/582
摘要： A process for urea production in a synthesis loop based on CO2 stripping is distinguished by the fact that at least part of a flow recycle carbamate is sent to a treatment of carbamate decomposition and removal of free ammonia to obtain a vapour flow containing CO2 and NH3 with minimum content of water, and a weak water carbamate solution sent back to a urea recovery unit URS and being at least part of above vapour flow containing CO2 and NH3 with minimum content of water directly fed to the bottom zone of a reaction space.

4. 发明申请

US20110306791A1 IMPROVEMENT TO THE HIGH-PRESSURE LOOP IN A PROCESS FOR SYNTHESIS OF UREA 有权
标题翻译：改进乌拉圭合成工艺中的高压环路
公开(公告)号：US20110306791A1
公开(公告)日：2011-12-15
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 , B01J8/00
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 diabatic 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剥离区的反应器（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。

5. 发明申请

US20100140543A1 Process and Plant for the Production of an Aqueous Solution Comprising Urea 有权
标题翻译：用于生产包含尿素的水溶液的方法和设备
公开(公告)号：US20100140543A1
公开(公告)日：2010-06-10
申请号：US12525655
申请日：2008-01-30
申请人： Federico Zardi
发明人： Federico Zardi
IPC分类号： C09K3/00 , B01J19/00 , B23P11/00
CPC分类号： C07C273/16 , B01D2251/2062 , B01J2219/00024 , Y10T29/49826
摘要： The present invention regards a process for the production of an aqueous solution comprising urea for use in the removal of nitrogen oxides from combustion gas or fumes, the process being characterised in that it comprises the steps of: -subjecting at least a part of a urea-concentrated aqueous solution comprising residual free ammonia, obtained directly from or downstream of a recovery section of a plant for the production of urea, to washing with carbon dioxide, so obtaining a first vapour phase comprising carbon dioxide and optionally ammonia and a urea-concentrated aqueous solution comprising carbamate and essentially lacking in free ammonia, and -diluting said urea-concentrated aqueous solution comprising carbamate and essentially lacking in free ammonia with water until the desired concentration of urea in aqueous solution is reached.
摘要翻译：本发明涉及用于生产包含尿素的水溶液的方法，该方法用于从燃烧气体或烟气中除去氮氧化物，该方法的特征在于其包括以下步骤： - 将至少一部分尿素包含残余游离氨的浓缩水溶液，其直接从用于生产尿素的设备的回收部分的下游获得，用二氧化碳洗涤，从而获得包含二氧化碳和任选的氨的第一气相和尿素浓缩包含氨基甲酸酯并且基本上不含游离氨的水溶液，并且用水稀释所述包含氨基甲酸酯并且基本上不含游离氨的尿素浓缩水溶液，直到达到所需浓度的尿素在水溶液中。

6. 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）。

7. 发明授权

US06702992B2 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：US06702992B2
公开(公告)日：2004-03-09
申请号：US09881099
申请日：2001-06-15
申请人： Giorgio Pagani , Federico Zardi
发明人： Giorgio Pagani , Federico Zardi
IPC分类号： B01J804
CPC分类号： C07C273/04 , B01D5/0012 , B01D5/0081 , B01J19/2425 , B01J2219/00024 , B01J2219/00081 , B01J2219/00159 , Y02P20/582
摘要： A method for the modernization of a plant for urea production of the type comprising a reactor (2) for urea synthesis, a stripping unit (3) with carbon dioxide and at least one vertical condensation unit (4) of the film type, foresees the provision of means (36) for feeding a major portion of a flow comprising ammonia and carbon dioxide in vapor phase leaving the stripping unit (3) to the condensation unit (4) and the provision in said condensation unit (4) of means (37) for subjecting to substantially total condensation such major portion of the flow comprising ammonia and carbon dioxide in vapour phase, obtaining a flow comprising urea and carbamate in aqueous solution, then fed to the reactor (2) for urea synthesis. Thanks to the present method of modernisation, the efficiency of the condensation unit (4) is remarkably improved, thus permitting an increase of its capacity.
摘要翻译：用于尿素生产用于尿素生产的设备的现代化方法包括用于尿素合成的反应器（2），具有二氧化碳的汽提单元（3）和膜类型的至少一个垂直冷凝单元（4），其预期为提供用于将气流中包含氨和二氧化碳的大部分流动供给到冷凝单元（4）的装置（36），并且在所述冷凝单元（4）中提供装置（37）），以使气相中含有氨和二氧化碳的大部分流动基本上完全冷凝，得到包含尿素和氨基甲酸酯在水溶液中的流动，然后送入反应器（2）进行尿素合成。由于现代化的现代化方法，冷凝单元（4）的效率显着提高，从而允许其容量增加。

8. 发明授权

US09708250B2 Process and plant for ammonia-urea production 有权
公开(公告)号：US09708250B2
公开(公告)日：2017-07-18
申请号：US14007100
申请日：2012-02-10
申请人： Ermanno Filippi , Marco Badano , Federico Zardi , Andrea Scotto
发明人： Ermanno Filippi , Marco Badano , Federico Zardi , Andrea Scotto
IPC分类号： C07C273/10 , C01C1/04
CPC分类号： C07C273/10 , C01C1/0488 , Y02P20/52 , C07C275/02
摘要： A process for ammonia-urea production where: liquid ammonia produced in an ammonia section is fed to a urea section directly at the ammonia synthesis pressure, and where the liquid ammonia is purified at high pressure with the steps of: cooling the liquid ammonia (20) obtaining a cooled liquid ammonia stream (21), separating a gaseous fraction (22) comprising hydrogen and nitrogen from said cooled liquid ammonia, obtaining purified liquid ammonia (23) at a high pressure, and reheating said purified liquid ammonia (23) after separation of said gaseous fraction, obtaining a reheated purified ammonia (24) having a temperature suitable for feeding to the urea synthesis process. The application also deals with an ammonia-urea plant comprising an ammonia cooler, a liquid-gas separator and an ammonia re-heater and with a method for revamping existing ammonia-urea plants.

9. 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.

10. 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。

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