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    Flexible integration of the production of ammonia and urea
    51.
    发明授权
    Flexible integration of the production of ammonia and urea 失效
    灵活地整合氨和尿素的生产

    公开(公告)号：US4988491A

    公开(公告)日：1991-01-29

    申请号：US336658

    申请日：1989-04-11

    申请人： Christiaan Van Dijk ,  Lowell D. Fraley

    发明人： Christiaan Van Dijk ,  Lowell D. Fraley

    IPC分类号： C01B3/02 ,  C07C273/10

    CPC分类号： C07C273/10 ,  C01B3/025

    摘要： The process of the present invention which produces the flexible integration for the production of ammonia and urea uses adiabatic reforming of the carbonaceous feedstock such as natural gas. With adiabatic reforming of natural gas, a surplus of carbon dioxide is produced. With adiabatic reforming, substantially pure oxygen and nitrogen may be used which does not involve inert gases such as argon in the system. More importantly, adibatic reforming allows operation at much higher pressure than standard primary reforming, namely, between 700 and 3000 psig. When these pressures are used, the process includes a recycle of the methane and hydrogen from the ammonia synthesis loop to the adiabatic reformer.The process of the present invention uniquely removes the carbon dioxide which is produced by the reforming of the carbonaceous feedstock and treatment by the watergas shift reaction in two independent stages. After the watergas shift, treatment of the ammonia synthesis gases is carried out preferably with a physical solvent, which removes at low cost most of the carbon dioxide. The remaining carbon dioxide is removed by reaction with ammonia, either hot or cold, respectfully leading to the production of ammonium carbamate, or ammonium carbonate.The process of the present invention, further, is characterized by making a significant change in operation upon obtaining the message that the urea plant has to be turned down or shut down for a short period of time.

    摘要翻译： 产生用于生产氨和尿素的柔性整合的本发明的方法使用碳质原料如天然气进行绝热重整。 通过天然气的绝热重整，产生过剩的二氧化碳。 使用绝热重整，可以使用基本上纯的氧和氮，其不涉及系统中的惰性气体如氩气。 更重要的是，独立重整允许在高于标准一次重整的压力下进行操作，即700至3000psig。 当使用这些压力时，该方法包括将甲烷和氢气从氨合成回路循环到绝热重整器。 本发明的方法独特地除去由碳质原料的重整产生的二氧化碳，并通过两个独立的阶段通过水煤气变换反应进行处理。 在氨气合成气移动之后，氨合成气的处理优选用物理溶剂进行，物理溶剂以低成本除去大部分二氧化碳。 剩余的二氧化碳通过与氨（热或冷）反应除去，从而导致产生氨基甲酸铵或碳酸铵。 此外，本发明的方法的特征在于，在获得关于尿素设备必须在短时间内被关闭或关闭的消息时，进行显着的操作改变。

    Integrated urea-ammonia process
    52.
    发明授权
    Integrated urea-ammonia process 失效
    综合尿素氨法

    公开(公告)号：US4012443A

    公开(公告)日：1977-03-15

    申请号：US586359

    申请日：1975-06-12

    申请人： Andrea Bonetti

    发明人： Andrea Bonetti

    IPC分类号： C01B3/52 ,  C01C1/04 ,  C01C1/26 ,  C07C67/00 ,  C07C239/00 ,  C07C273/04 ,  C07C273/10 ,  C07C126/00

    CPC分类号： C07C273/10 ,  Y02P20/125

    摘要： Improved integrated process for simultaneous synthesis of ammonia and urea. Improved yields of urea in purified form are obtained by a simple process which curtails the addition of external water to the process. Two carbon dioxide absorbers are employed. A concentrated ammonium carbonate solution is utilized in the primary carbon dioxide absorber. A secondary carbon dioxide absorber is downstream in series to the first or primary carbon dioxide absorber. An ammonical solution of ammonium carbonate is utilized in the secondary carbon dioxide absorber.

    摘要翻译： 改进的同时合成氨和尿素的综合工艺。 通过简单的方法获得纯化形式的尿素产率提高，这样可以减少加入过程中的外部水分。 使用两种二氧化碳吸收剂。 在一次二氧化碳吸收器中使用浓缩的碳酸铵溶液。 次级二氧化碳吸收器与第一或一级二氧化碳吸收器串联下游。 在二次二氧化碳吸收器中使用碳酸铵的氨溶液。

    Process for removing carbon dioxide in a combined system for producing ammonia and urea
    53.
    发明授权
    Process for removing carbon dioxide in a combined system for producing ammonia and urea 失效
    用于生产氨和尿素的组合系统中的二氧化碳去除方法

    公开(公告)号：US3640052A

    公开(公告)日：1972-02-08

    申请号：US3640052D

    申请日：1970-03-11

    申请人： TOYO ENGINEERING CORP ,  MITSUI TOATSU CHEMICALS

    发明人： KONOKI KEIZO ,  OHSAKI KOZO

    IPC分类号： C01C1/02 ,  C07C67/00 ,  C07C239/00 ,  C07C273/04 ,  C07C273/10 ,  B01D53/14

    CPC分类号： C07C273/10 ,  Y02C10/06

    摘要： A process and apparatus for removing excess carbon dioxide from a crude ammonia synthesis gas to be used for producing ammonia and urea, in which the incoming crude ammonia synthesis gas is separated into two streams. One stream is flowed into a scrubbing zone wherein it is contacted with a scrubbing solution so that the partial pressure of the carbon dioxide in the one stream leaving the scrubbing zone is in the range of about 0.02-1.5 atmospheres, under a total pressure of above about 10 atmospheres, at a temperature of about 85*-130* C. The other stream is not scrubbed. The two streams are then combined and are fed to an ammonia and a urea synthesis system. The amount of carbon dioxide removed is changed by adjusting the amounts of gas flowing in the two streams.

    摘要翻译： 用于从用于生产氨和尿素的粗氨合成气中除去过量二氧化碳的方法和装置，其中进入的粗氨合成气分离成两股。 一个流流入洗涤区域，其中其与洗涤溶液接触，使得离开洗涤区的一个流中的二氧化碳的分压在约0.02-1.5个大气压的范围内，在总压力下 约10个大气压，在约85℃-130℃的温度。另一个流不被洗涤。 然后将两股流合并，并送入氨和尿素合成系统。 通过调节在两股流中流动的气体量来改变去除的二氧化碳的量。