公开(公告)号：EP2119710A1

公开(公告)日：2009-11-18

申请号：EP08008958.4

申请日：2008-05-14

申请人： UREA CASALE S.A.

发明人： Sioli, Giancarlo

IPC分类号： C07D251/60

CPC分类号： C07D251/60 ,  B01J10/005 ,  B01J19/0013 ,  B01J19/002 ,  B01J19/006 ,  B01J19/0066 ,  B01J19/18 ,  B01J2219/0004 ,  B01J2219/00083 ,  B01J2219/00135 ,  B01J2219/00189 ,  B01J2219/00768 ,  B01J2219/182 ,  B01J2219/185 ,  B01J2219/1943

摘要： A process for high-pressure, liquid phase conversion of urea into melamine is disclosed, where molten urea is fed to a first reaction zone (S1) where the melamine melt is under mechanical agitation, and a heat input (Q1) is provided to maintain the endothermic reaction, and the liquid is then passed to a second reaction zone (S2) kept at a lower temperature and where further agitation is provided. Embodiments of plants adapted to carry out the process are also disclosed, including multiple stirred reactors in cascade and a single reactor with multiple internal compartments defining said first and second reaction zones.

摘要翻译： 公开了一种将尿素高压液相转化为三聚氰胺的方法，其中将熔融的尿素进料到三聚氰胺熔体在机械搅动下的第一反应区（S1），并且提供热输入（Q1）以维持 然后将吸热反应和液体通入保持在较低温度的第二反应区（S2）并进一步搅拌。 还公开了适于实施该方法的设备的实施方案，包括级联的多个搅拌反应器和具有限定所述第一和第二反应区域的多个内部隔室的单个反应器。

公开(公告)号：EP2114872A1

公开(公告)日：2009-11-11

申请号：EP08707397.9

申请日：2008-01-30

申请人： Urea Casale S.A.

发明人： ZARDI, Federico

IPC分类号： C07C273/16 ,  B01D53/94

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.

公开(公告)号：EP2109496A1

公开(公告)日：2009-10-21

申请号：EP07870210.7

申请日：2007-12-21

申请人： Urea Casale S.A.

发明人： BEDETTI, Gianfranco

IPC分类号： B01J2/16

CPC分类号： B01J2/16

摘要： Fluid bed granulation process comprising the steps of: - forming a fluid bed of seeds (Sl) of a chosen substance, - feeding said fluid bed with a continuous fluid flow (L) comprising a growth liquid, - inducing and maintaining a continuous vortex (V) in said fluid bed, the vortex (V) having a substantially horizontal axis, characterized in that said fluid flow (L) is fed into predetermined first zones (Zl) of said fluid bed, said first zones (Zl) being alternated to second zones (Z2) of said fluid bed in which said fluid flow (L) is not fed.

公开(公告)号：EP2098516A1

公开(公告)日：2009-09-09

申请号：EP08004013.2

申请日：2008-03-04

申请人： UREA CASALE S.A.

发明人： Sioli, Giancarlo

IPC分类号： C07D251/60 ,  C07D251/62 ,  B01J19/18

CPC分类号： C07D251/62 ,  B01D9/0013 ,  B01J19/006 ,  B01J19/18 ,  B01J19/1862 ,  B01J19/1881 ,  B01J2219/00083 ,  B01J2219/00768 ,  C07D251/46 ,  C07D251/52 ,  C07D251/60

摘要： The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of:
- quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates,
- recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,
- treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content.
The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant.

摘要翻译： 本发明涉及获得高纯度三聚氰胺的方法，其特征在于包括以下步骤：猝灭三聚氰胺熔体，除去三聚氰胺合成物的废气，并含有三聚氰胺杂质如氨米林，ammelide和缩聚物，其中包含 氨在基本上将缩聚物转化为三聚氰胺，获得基本上不含缩聚物的三聚氰胺溶液， - 通过三聚氰胺结晶从所述三聚氰胺溶液中回收三聚氰胺，获得三聚氰胺晶体和三聚氰胺结晶母液， - 在条件下处理所述结晶三聚氰胺母液 从而将其至少一部分的ammeline含量转化成ammelide和melamine，从而获得至少具有降低的ammeline含量的经处理的母液。 本发明还涉及用于生产高纯度三聚氰胺的高压非催化装置，其实施上述方法和适用于该装置的装置。

公开(公告)号：EP2094652A1

公开(公告)日：2009-09-02

申请号：EP07818806.7

申请日：2007-10-09

申请人： UREA CASALE S.A.

发明人： ZARDI, Federico ,  STICCHI, Paolo ,  BRUNENGO, Paolo

IPC分类号： C07C273/12

CPC分类号： C07D251/62 ,  B01J19/245 ,  B01J2219/24 ,  C07C273/12 ,  C07C273/16 ,  Y02P20/125 ,  Y02P20/582

摘要： In an integrated process for urea and melamine production, urea is produced in a urea plant (10) comprising a high pressure urea synthesis section (11) from which an aqueous solution comprising urea, ammonium carbonate and ammonia is obtained and a urea recovery section (21) operating at low pressure, and melamine is produced in a melamine plant (40) wherein off-gases resulting as by-products of the melamine synthesis are discharged from said plant at a medium pressure and recycled to the high-pressure urea synthesis section (11).

摘要翻译： 在用于尿素和三聚氰胺生产的综合方法中，在包含高压尿素合成段（11）的尿素装置（10）中生产尿素，从其中获得包含尿素，氨基甲酸铵和氨的水溶液和尿素回收段（ 21），在三聚氰胺装置（40）中产生三聚氰胺，其中作为三聚氰胺合成的副产物产生的废气在中压下从所述设备排出并再循环到高压尿素合成段 （11）。

公开(公告)号：EP2077147A1

公开(公告)日：2009-07-08

申请号：EP08000098.7

申请日：2008-01-04

申请人： UREA CASALE S.A.

发明人： Zardi, Federico

IPC分类号： B01J2/16

CPC分类号： B05D1/24 ,  B01J2/16 ,  B05C19/02

摘要： A fluid bed granulation process and apparatus, wherein a suitable fluid bed of a particulate material is maintained in a granulator (1) fed by an input flow (F) comprising a growth liquid (L) and by a flow (S1) of seeds adapted to promote the granulation, and wherein a part (F2) of said input flow (F) is taken upstream the feeding of the fluid bed, and used in a seeds generator (33), to produce the seeds for the fluid bed.

摘要翻译： 一种流化床造粒方法和装置，其中将颗粒材料的合适的流化床保持在由包含生长液体（L）的输入流（F）和由适应的种子流（S1））供给的造粒机（1）中 以促进造粒，并且其中所述输入流（F）的部分（F2）在流体床的进料的上游被采集并用于种子发生器（33）中，以产生用于流化床的种子。

公开(公告)号：EP1975151A1

公开(公告)日：2008-10-01

申请号：EP07006566.9

申请日：2007-03-29

申请人： UREA CASALE S.A.

发明人： Zardi, Federico

IPC分类号： C07C273/04 ,  B01J19/00

CPC分类号： C07C273/04 ,  B01J2219/00006 ,  Y02P20/142 ,  Y02P20/582

摘要： A method for the modernisation 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 type, includes the step of providing in said at least one condensation unit (4) means for subjecting to substantially total condensation at least a portion of a flow comprising ammonia and carbon dioxide in vapour phase leaving said stripping unit (3), and is characterized in that it further comprises the steps of providing a second stripping unit (47), means (9) for feeding a first portion of the flow of reaction mixture comprising urea, carbamate and free ammonia in aqueous solution leaving the reactor (2) to said stripping unit (3), means (48) for feeding a second portion of the flow of reaction mixture comprising urea, carbamate and free ammonia in aqueous solution leaving the reactor (2) to said second stripping unit (47)and means (49) for feeding at least a portion of a flow comprising ammonia and carbon dioxide in vapour phase leaving said second stripping unit (47) directly to the reactor synthesis (2). Thanks to the present method of modernisation, a substantial de-bottlenecking of the equipment of the high-pressure section downstream the synthesis reactor (2) may be achieved, especially for large installation, to the full advantage of the overall production capacity, which may be therefore increased in a optimal way.

摘要翻译： 一种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）和至少一个膜型的垂直冷凝单元（4），包括 在所述至少一个冷凝单元（4）中提供的步骤是使得包含氨和二氧化碳的至少一部分流动基本上完全冷凝，使其离开所述汽提单元（3），并且其特征在于它 进一步包括提供第二汽提单元（47）的步骤，用于将离开反应器（2）的尿素，氨基甲酸盐和游离氨的反应混合物流的第一部分的水溶液进料到所述汽提单元（9） 3），用于将离开反应器（2）的水溶液中的包含尿素，氨基甲酸酯和游离氨的反应混合物流的第二部分进料到所述第二汽提单元（47）的装置（48）和用于在 最小的 在气相中包含氨和二氧化碳的流动，使所述第二汽提单元（47）直接进入反应器合成（2）。 由于目前的现代化方法，可以实现对合成反应器（2）下游的高压段的设备的实质性解除瓶颈，特别是对于大的安装，可以充分利用总体生产能力， 因此以最佳方式增加。

公开(公告)号：EP1953137A1

公开(公告)日：2008-08-06

申请号：EP07002265.2

申请日：2007-02-02

申请人： UREA CASALE S.A.

发明人： Zardi, Federico

IPC分类号： C07C273/16 ,  B01D53/94

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，其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和尿素浓缩的第一气相 包含氨基甲酸酯并且基本上不含游离氨的水溶液，以及 - 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。

公开(公告)号：EP1923383A1

公开(公告)日：2008-05-21

申请号：EP06024016.5

申请日：2006-11-20

申请人： UREA CASALE S.A.

发明人： Pagani, Giorgio

IPC分类号： C07C273/04

CPC分类号： C07C273/04 ,  B01J2219/00024 ,  Y02P20/142

摘要： A method for revamping a urea plant of the type comprising a synthesis section (2) having a urea synthesis reactor (5), a thermal stripping unit (7) and at least one horizontal condensation unit (6), a treatment section (3) operating at medium pressure and a recovery section (4) operating at low pressure foresees the transformation of said at least one horizontal condensation unit (6) into a vertical condensation unit of the submerged type comprising a tube bundle and the provision of means (37, 41) for feeding a flow comprising ammonia and carbon dioxide in vapour phase and a flow of condensation liquid comprising carbamate simultaneously and independently in each of the tubes of said tube bundle with circulation inside said tubes in equicurrent from the bottom towards the top, and means (39, 50) for feeding at least one part of the feed carbon dioxide into said stripping unit (7) for use as stripping agent. Thanks to the present revamping method, the efficiency of the condensation unit (6) is substantially improved, consequently allowing an increase in its capacity and it is possible to leave out the medium pressure treatment section (3) thus obtaining a reduction in energy and maintenance costs.

摘要翻译： 一种用于改进包括具有尿素合成反应器（5），热剥离单元（7）和至少一个水平冷凝单元（6）的合成部分（2）的类型的尿素设备的方法，处理部分（3） 在中等压力下操作并且在低压下操作的回收部分（4）预见到所述至少一个水平冷凝单元（6）变成包括管束的浸没式的垂直冷凝单元，并且提供装置 41），其用于在气相中包含氨和二氧化碳的流动，并且包含氨基甲酸酯的冷凝液流同时且独立地在所述管束的每个管中，其中所述管内的循环从底部朝向顶部等同， （39,50），用于将进料二氧化碳的至少一部分进料到所述汽提单元（7）中用作剥离剂。 由于本改进方法，冷凝装置（6）的效率显着提高，从而允许其容量增加，并且可以省略中压处理部（3），从而获得能量和维护的减少 成本。

公开(公告)号：EP1918273A1

公开(公告)日：2008-05-07

申请号：EP06022991.1

申请日：2006-11-04

申请人： UREA CASALE S.A.

发明人： Zardi, Federico ,  Sticchi, Paolo ,  Brunengo, Paolo

IPC分类号： 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获得的包含尿素，氨基甲酸铵和氨的水溶液的一部分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部分中分解，并使用至少部分冷凝蒸汽，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，作为用于在包含尿素，氨基甲酸铵和氨的第一部分的水溶液中解离的加热流体， 压力处理部。