专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5484582A Process for ammonia recovery in ammonia production 失效
标题翻译：氨生产氨回收工艺
公开(公告)号：US5484582A
公开(公告)日：1996-01-16
申请号：US144186
申请日：1993-10-27
申请人： Jing M. Lee
发明人： Jing M. Lee
IPC分类号： C01B3/02 , C01C1/04
CPC分类号： C01C1/047 , C01B3/025 , Y02P20/52 , Y10S62/934
摘要： A process and unit for the recovery of ammonia in ammonia production are disclosed. All or a portion of a high pressure liquid ammonia product stream is introduced into a syngas makeup stream to produce a mixed vapor-liquid refrigeration medium for condensing ammonia from a synthesis loop product stream. Following the product stream ammonia condensation step, the vapor component of the mixed vapor-liquid stream is compressed and cooled for condensing ammonia therefrom. Liquid ammonia separated from the low pressure mixed vapor-liquid stream can be withdrawn as a low pressure liquid ammonia product. An ammonia-lean makeup gas is then combined with the ammonia-containing product recycle gas stream from the synthesis loop and further compressed. The process preferably includes recycle of all or a portion of the low pressure liquid ammonia product as a supplemental refrigerant. A high pressure, ammonia-lean syngas vapor stream obtained following separation of the high pressure ammonia condensate can be used as a process cooling medium for chilling the syngas makeup stream and syngas stream. In such a manner, both ammonia and syngas compression can be consolidated in a single syngas compressor and the use of an ammonia refrigeration compressor can be eliminated.
摘要翻译：公开了用于在氨生产中回收氨的方法和单元。将全部或一部分高压液氨产物流引入合成气补充流中以产生用于冷凝来自合成环产物流的氨的混合汽液冷冻介质。在产物流氨冷凝步骤之后，混合汽液流的蒸气成分被压缩并冷却，以从其中冷凝氨。从低压混合气液流中分离的液氨可以作为低压液氨产物取出。然后将氨贫补充气体与来自合成回路的含氨产物循环气流合并并进一步压缩。该方法优选包括作为补充制冷剂的全部或一部分低压液氨产物的再循环。在分离高压氨冷凝物之后获得的高压，贫氨合成气蒸汽流可用作冷却合成气补充流和合成气流的工艺冷却介质。以这种方式，氨和合成气压缩可以在单个合成气压缩机中固化，并且可以消除使用氨制冷压缩机。

2. 发明授权

US5520891A Cross-flow, fixed-bed catalytic reactor 失效
标题翻译：交叉流动，固定床催化反应器
公开(公告)号：US5520891A
公开(公告)日：1996-05-28
申请号：US189968
申请日：1994-02-01
申请人： Jing M. Lee
发明人： Jing M. Lee
IPC分类号： B01J8/02 , F28D7/08 , C07C31/04
CPC分类号： B01J8/0285 , B01J8/025 , F28D7/08 , F28D7/085 , B01J2208/00141 , B01J2219/00083 , F28F2275/02 , Y10S165/91 , Y10S423/12
摘要： Disclosed are a fixed-bed, cross-flow catalytic reactor wherein reaction heat can be exchanged against a heat exchange medium circulating indirectly through the catalyst bed, and a catalytic process comprising operation of the cross-flow reactor. The reactor comprises a catalyst bed having internally embedded banks of heat exchange tubes. An inlet distributor distributes reactants along the axial length of the bed. The distributed fluid passes through the bed in a cross-flow path wherein a catalytic reaction occurs. The reaction effluent is then collected from the bed by an outlet product collector. A heat exchange medium circulated through the internal heat exchange tubes adds or removes reaction heat as required for enhanced conversion in the reactor. Multiple heat exchange tubes can be used, and inlet and discharge manifolds are provided for distributing the circulating heat exchange medium. The heat exchange tubes can be spaced in accordance with the heat interchange required to optimize the reaction rate. A relatively shorter cross-flow path through a relatively larger flow area enhances reactor performance by allowing the catalyst particle size to be reduced without substantially increasing pressure drop.
摘要翻译：公开了一种固定床交叉催化反应器，其中反应热可以间接地通过催化剂床循环的热交换介质和包括流动反应器的操作的催化方法交换。反应器包括具有内部嵌入的热交换管组的催化剂床。入口分配器沿着床的轴向长度分布反应物。分布的流体在其中发生催化反应的交叉流动路径中通过床。然后通过出口产物收集器从床中收集反应流出物。循环通过内部热交换管的热交换介质根据反应器中提高的转化所需加入或除去反应热。可以使用多个换热管，并且提供入口和排出歧管以分配循环热交换介质。热交换管可以根据优化反应速率所需的热交换间隔开。通过相对较大的流动面积的相对较短的横流路径通过允许催化剂粒度减小而基本上不增加压降来提高反应器性能。

3. 发明授权

US5384404A Process for manufacturing melamine from urea 失效
标题翻译：从尿素制造三聚氰胺的工艺
公开(公告)号：US5384404A
公开(公告)日：1995-01-24
申请号：US147848
申请日：1993-11-05
申请人： Jing M. Lee
发明人： Jing M. Lee
IPC分类号： C07D251/60
CPC分类号： C07D251/60 , Y02P20/51
摘要： An improved process for manufacturing melamine from urea simplifies the recovery of melamine, carbamate and ammonia from a fluidized bed reactor effluent stream by operating the process at a pressure between 1.4 and 2 MPa. In such a manner, a carbamate solution can be produced at a sufficiently high concentration for use in a urea plant without an intervening concentration step. In addition, ammonia recycled as a fluidizing gas can be condensed against cooling water to permit easy separation of noncondensables such as oxygen which used in the process as a passivator for carbamate corrosion inhibition. The melamine product is produced as an aqueous solution free of melamine solids. Heat is recovered from the carbamate condensation and used for the vaporization of ammonia which is recycled to the reactor for fluidization.
摘要翻译：从尿素制备三聚氰胺的改进方法通过在1.4-2MPa的压力下操作该方法简化了来自流化床反应器流出物流的三聚氰胺，氨基甲酸酯和氨的回收。以这种方式，可以以足够高的浓度制备氨基甲酸酯溶液用于尿素设备中，而不需要中间浓缩步骤。此外，作为流化气体再循环的氨可以与冷却水冷凝，以容易地分离作为用于氨基甲酸酯腐蚀抑制的钝化剂的过程中使用的不可冷凝物例如氧气。三聚氰胺产物作为不含三聚氰胺固体的水溶液生产。从氨基甲酸酯缩合中回收热量，并用于蒸发氨，将其再循环到反应器进行流化。

4. 发明授权

US5597454A Process for producing urea 失效
标题翻译：生产尿素的方法
公开(公告)号：US5597454A
公开(公告)日：1997-01-28
申请号：US418089
申请日：1995-04-06
申请人： Jing M. Lee
发明人： Jing M. Lee
IPC分类号： B01D3/34 , B01D3/38 , C07C273/04 , B01D3/00 , C07C273/16
CPC分类号： B01D3/34 , B01D3/38 , C07C273/04 , Y02P20/124 , Y02P20/57
摘要： A urea production process combining lower pressure urea concentration and carbamate recovery steps into a single non-vacuum operation. Following high pressure stripping wherein a bulk of unreacted carbamate is recovered from the reaction effluent, remaining carbamate is stripped by heated air at atmospheric pressure wherein urea is concurrently concentrated without the use of vacuum evaporators. Weak carbamate solution subsequently formed is stripped of water (and residual urea is hydrolyzed) using air and steam at a medium pressure single tower hydrolyzer/stripper to obtain a concentrated carbamate stream suitable for recycle to the reactor. The process employs heat integration for enhanced energy efficiency and produces a good quality aqueous condensate suitable for direct use as boiler feed water. Thus the aqueous condensate produced requires no additional cooling and ammonia treatment. The process employs simplified and reduced process unit operation to eliminate equipment for cost reduction.
摘要翻译：将低压尿素浓度和氨基甲酸酯回收步骤组合成单一非真空操作的尿素生产方法。在高压汽提之后，从反应流出物中回收大量未反应的氨基甲酸酯，剩余的氨基甲酸酯在大气压下被加热的空气汽提，其中尿素同时浓缩而不使用真空蒸发器。使用空气和蒸汽在中压单塔水解器/汽提器上将随后形成的弱氨基甲酸酯溶液除去水（和残留的尿素水解），得到适于再循环至反应器的浓氨基甲酸酯流。该方法采用热集成来提高能源效率，并产生适合直接用作锅炉给水的优质水凝胶。因此，产生的水凝胶不需要额外的冷却和氨处理。该过程采用简化和简化的过程单元操作，以消除设备降低成本。

5. 发明授权

US5180570A Integrated process for making methanol and ammonia 失效
标题翻译：制造甲醇和氨的综合工艺
公开(公告)号：US5180570A
公开(公告)日：1993-01-19
申请号：US824954
申请日：1992-01-23
申请人： Jing M. Lee , Joseph R. LeBlanc
发明人： Jing M. Lee , Joseph R. LeBlanc
IPC分类号： C01B3/02 , C01B3/34 , C01C1/04 , C07C29/151 , F25J3/04
CPC分类号： C07C29/1518 , C01B3/025 , C01B3/34 , C01C1/0488 , F25J3/04539 , F25J3/04587 , F25J2205/30 , Y02P20/125 , Y02P20/52
摘要： An integrated process for making methanol and ammonia from a hydrocarbon feed stock and air is disclosed. An air separation unit is used to produce substantially pure oxygen and nitrogen gas streams. The oxygen gas is used in the secondary reformer to increase the operating pressure of the reformers so that compression to methanol synthesis pressure may be done by a single stage compressor. The nitrogen gas is used to remove carbon oxides impurities from a ammonia synthesis feed stream in a nitrogen wash unit in addition to supplying the nitrogen reactant in the ammonia synthesis gas. Use of nitrogen wash obviates the need for steam shift and methanation reactions used in prior art processes.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式