公开(公告)号：US20100016635A1

公开(公告)日：2010-01-21

申请号：US12176534

申请日：2008-07-21

Applicant: Vishnu D. Singh

Inventor： Vishnu D. Singh

IPC: C07C273/04

CPC classification number: C07C273/04 ,  C01B21/12 ,  C01C1/0488 ,  Y02P20/52

Abstract: Systems and methods for producing urea are provided. A method for producing urea can include exchanging heat from a syngas comprising hydrogen and carbon dioxide to a urea solution comprising urea and ammonium carbamate. The heat transferred can be sufficient to decompose at least a portion of the ammonium carbamate. In one or more embodiments, the syngas can be reacted with liquid ammonia to provide a carbon dioxide lean syngas and an ammonium carbamate solution. The ammonium carbamate solution can be heated to a temperature of about 180° C. or more. At least a portion of the ammonium carbamate in the heated ammonium carbamate solution can be dehydrated to provide the urea solution.

Abstract translation: 提供了制备尿素的系统和方法。 生产尿素的方法可以包括将来自包含氢气和二氧化碳的合成气的热交换到包含尿素和氨基甲酸铵的尿素溶液中。 转移的热量足以分解至少一部分氨基甲酸铵。 在一个或多个实施方案中，合成气可与液氨反应以提供贫二氧化碳合成气和氨基甲酸铵溶液。 氨基甲酸铵溶液可以加热至约180℃或更高的温度。 加热的氨基甲酸铵溶液中的氨基甲酸铵的至少一部分可以被脱水以提供尿素溶液。

公开(公告)号：US07687041B2

公开(公告)日：2010-03-30

申请号：US12038285

申请日：2008-02-27

Applicant: Vishnu D. Singh

Inventor： Vishnu D. Singh

IPC: B01J19/00 ,  C07C273/02

CPC classification number: C07C273/04 ,  B01J19/30 ,  B01J19/32 ,  B01J2219/00006

Abstract: Apparatus and methods for producing urea are provided. In one or more embodiments, an apparatus for producing urea can include a first zone, which can include a first flow channel in fluid communication with a first tube disposed about a first end of a plurality of trays, a second flow channel in fluid communication with a second tube disposed about the first end of the trays and a second end of the trays, and a third flow channel in fluid communication with a third tube disposed about the first and second ends of the trays. The apparatus can include a second zone, which can include a fixed bed comprising one or more inert packing materials disposed therein to provide additional surface area. The apparatus can include a third zone, which can include a plurality of tubes disposed therein. The second zone can be disposed between the first and third zones.

Abstract translation: 提供尿素生产设备和方法。 在一个或多个实施例中，用于生产尿素的装置可以包括第一区域，其可以包括与围绕多个托盘的第一端设置的第一管道流体连通的第一流动通道， 围绕托盘的第一端设置的第二管和托盘的第二端，以及与围绕托盘的第一和第二端设置的第三管流体连通的第三流动通道。 该设备可以包括第二区域，其可以包括固定床，该固定床包括设置在其中的一个或多个惰性填充材料以提供额外的表面积。 该装置可以包括第三区，其可以包括设置在其中的多个管。 第二区域可以设置在第一和第三区域之间。

公开(公告)号：US07642377B1

公开(公告)日：2010-01-05

申请号：US12176534

申请日：2008-07-21

Applicant: Vishnu D. Singh

Inventor： Vishnu D. Singh

IPC: C07C273/02 ,  C07C273/04 ,  F28D9/00 ,  B01J8/04 ,  B01J8/00 ,  B01J10/00 ,  B01J10/02

CPC classification number: C07C273/04 ,  C01B21/12 ,  C01C1/0488 ,  Y02P20/52

Abstract: Systems and methods for producing urea are provided. A method for producing urea can include exchanging heat from a syngas comprising hydrogen and carbon dioxide to a urea solution comprising urea and ammonium carbamate. The heat transferred can be sufficient to decompose at least a portion of the ammonium carbamate. In one or more embodiments, the syngas can be reacted with liquid ammonia to provide a carbon dioxide lean syngas and an ammonium carbamate solution. The ammonium carbamate solution can be heated to a temperature of about 180° C. or more. At least a portion of the ammonium carbamate in the heated ammonium carbamate solution can be dehydrated to provide the urea solution.

Abstract translation: 提供了制备尿素的系统和方法。 生产尿素的方法可以包括将来自包含氢气和二氧化碳的合成气的热交换到包含尿素和氨基甲酸铵的尿素溶液中。 转移的热量足以分解至少一部分氨基甲酸铵。 在一个或多个实施方案中，合成气可与液氨反应以提供贫二氧化碳合成气和氨基甲酸铵溶液。 氨基甲酸铵溶液可以加热至约180℃或更高的温度。 加热的氨基甲酸铵溶液中的氨基甲酸铵的至少一部分可以被脱水以提供尿素溶液。

公开(公告)号：US08481786B2

公开(公告)日：2013-07-09

申请号：US12627777

申请日：2009-11-30

Applicant: Vishnu D. Singh

Inventor： Vishnu D. Singh

IPC: C07C273/02

CPC classification number: C07C273/04 ,  C01B21/12 ,  C01C1/0488 ,  Y02P20/52

Abstract: Methods for producing urea are provided. A method for producing urea can include exchanging heat from a syngas comprising hydrogen and carbon dioxide to a urea solution comprising urea and ammonium carbamate. The heat transferred can be sufficient to decompose at least a portion of the ammonium carbamate. In one or more embodiments, the syngas can be reacted with liquid ammonia to provide a carbon dioxide lean syngas and an ammonium carbamate solution. The ammonium carbamate solution can be heated to a temperature of about 180 C. or more. At least a portion of the ammonium carbamate in the heated ammonium carbamate solution can be dehydrated to provide the urea solution.

Abstract translation: 提供生产尿素的方法。 生产尿素的方法可以包括将来自包含氢气和二氧化碳的合成气的热交换到包含尿素和氨基甲酸铵的尿素溶液中。 转移的热量足以分解至少一部分氨基甲酸铵。 在一个或多个实施方案中，合成气可与液氨反应以提供贫二氧化碳合成气和氨基甲酸铵溶液。 氨基甲酸铵溶液可以加热至约180℃或更高的温度。 加热的氨基甲酸铵溶液中的氨基甲酸铵的至少一部分可以被脱水以提供尿素溶液。

公开(公告)号：US20100076222A1

公开(公告)日：2010-03-25

申请号：US12627777

申请日：2009-11-30

Applicant: Vishnu D. Singh

Inventor： Vishnu D. Singh

IPC: C07C273/02

CPC classification number: C07C273/04 ,  C01B21/12 ,  C01C1/0488 ,  Y02P20/52

Abstract: Methods for producing urea are provided. A method for producing urea can include exchanging heat from a syngas comprising hydrogen and carbon dioxide to a urea solution comprising urea and ammonium carbamate. The heat transferred can be sufficient to decompose at least a portion of the ammonium carbamate. In one or more embodiments, the syngas can be reacted with liquid ammonia to provide a carbon dioxide lean syngas and an ammonium carbamate solution. The ammonium carbamate solution can be heated to a temperature of about 180 C or more. At least a portion of the ammonium carbamate in the heated ammonium carbamate solution can be dehydrated to provide the urea solution.

Abstract translation: 提供生产尿素的方法。 生产尿素的方法可以包括将来自包含氢气和二氧化碳的合成气的热交换到包含尿素和氨基甲酸铵的尿素溶液中。 转移的热量足以分解至少一部分氨基甲酸铵。 在一个或多个实施方案中，合成气可与液氨反应以提供贫二氧化碳合成气和氨基甲酸铵溶液。 氨基甲酸铵溶液可以加热至约180℃或更高的温度。 加热的氨基甲酸铵溶液中的氨基甲酸铵的至少一部分可以被脱水以提供尿素溶液。

公开(公告)号：US5523483A

公开(公告)日：1996-06-04

申请号：US490929

申请日：1995-06-16

Applicant: Vishnu D. Singh ,  Meghji N. Shah ,  Richard B. Strait

Inventor： Vishnu D. Singh ,  Meghji N. Shah ,  Richard B. Strait

IPC: C01B3/48 ,  C01B3/02 ,  C01C1/04 ,  C07C273/04 ,  C07C273/10 ,  C07C275/00

CPC classification number: C07C273/04 ,  C01B3/025 ,  C01C1/0488 ,  C07C273/10 ,  Y02P20/52

Abstract: An integrated ammonia/urea process and a plant for carrying out the same. The process comprises recycling a high pressure purge stream made up mostly of air from the urea synthesis cycle to the autothermal reformer in a syngas production unit of the ammonia process. In such a manner, compression energy required for ammonia synthesis can be reduced since a portion of the high pressure air feed to the autothermal reactor is supplied by the urea purge stream recycle. In addition, the equipment needed to clean up the urea purge stream is largely eliminated.

Abstract translation: 一个综合的氨/尿素工艺和一个用于执行它的设备。 该方法包括将由尿素合成循环中主要由空气构成的高压吹扫流循环到氨过程的合成气生产单元中的自热重整器。 以这种方式，可以减少氨合成所需的压缩能量，因为通过尿素吹扫流循环供应到自热反应器的一部分高压空气进料。 此外，清理尿素清除流所需的设备大部分被消除。