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94 条记录 (耗时 0.015 秒)

    Process for combined production of ammonia and urea
    31.
    发明授权
    Process for combined production of ammonia and urea 有权
    氨和尿素联合生产工艺

    公开(公告)号：US06231827B1

    公开(公告)日：2001-05-15

    申请号：US09144266

    申请日：1998-08-31

    申请人： Giorgio Pagani ,  Umberto Zardi

    发明人： Giorgio Pagani ,  Umberto Zardi

    IPC分类号： C01C104

    CPC分类号： C07C273/10 ,  C01C1/0488 ,  Y02P20/52 ,  Y02P20/582

    摘要： A process for the combined production of ammonia and urea of the type comprising an ammonia synthesis reactor (2), a urea synthesis reactor (5) and a urea recovery section (21) stands out for the fact of submitting at least a part of a flow comprising carbamate in aqueous solution coming from the urea recovery section (21) to a partial decomposition treatment, to obtain a flow comprising ammonia and carbon dioxide in vapor phase and a flow comprising diluted carbamate in aqueous solution, which is fed together with a gas flow comprising hydrogen, nitrogen and carbon dioxide, preferably obtained by hydrocarbons steam reforming, and a flow comprising ammonia coming from the ammonia synthesis reactor (2) to a carbamate synthesis section (3), where ammonia and carbon dioxide are caused to react, to obtain a flow comprising carbamate in aqueous solution and a gas flow comprising hydrogen and nitrogen. The flow comprising carbamate in aqueous solution is then sent to the urea synthesis reactor (5), while the gas flow comprising hydrogen and nitrogen is sent to the ammonia synthesis reactor (2).

    摘要翻译： 包括氨合成反应器（2），尿素合成反应器（5）和尿素回收部分（21）类型的氨和尿素的组合生产方法脱颖而出，因为提交至少一部分 将来自尿素回收部（21）的水溶液中含有氨基甲酸酯的流体进行部分分解处理，以获得气相中含有氨和二氧化碳的流动，以及在水溶液中包含稀释的氨基甲酸酯的流体，其与气体 包括氢，氮和二氧化碳的流，优选通过烃蒸汽重整获得，以及包含氨的流从氨合成反应器（2）到氨基甲酸酯合成段（3）的流动，其中使氨和二氧化碳反应， 获得在水溶液中包含氨基甲酸酯的流和包含氢和氮的气流。 然后将包含氨基甲酸酯在水溶液中的流送入尿素合成反应器（5），同时将包含氢气和氮气的气流送至氨合成反应器（2）。

    Integrated urea/ammonia process
    32.
    发明授权
    Integrated urea/ammonia process 失效
    综合尿素/氨法

    公开(公告)号：US5523483A

    公开(公告)日：1996-06-04

    申请号：US490929

    申请日：1995-06-16

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

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

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

    CPC分类号： C07C273/04 ,  C01B3/025 ,  C01C1/0488 ,  C07C273/10 ,  Y02P20/52

    摘要： 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.

    摘要翻译： 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。

    Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions
    33.
    发明授权
    Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions 失效
    从稀水溶液中除去尿素，氨和二氧化碳的方法

    公开(公告)号：US4410503A

    公开(公告)日：1983-10-18

    申请号：US353385

    申请日：1982-03-01

    申请人： Petrus J. M. van Nassau ,  Adolphe M. Douwes

    发明人： Petrus J. M. van Nassau ,  Adolphe M. Douwes

    IPC分类号： C01C1/12 ,  C02F1/02 ,  C07C67/00 ,  C07C239/00 ,  C07C273/10 ,  C01C1/04

    CPC分类号： C02F1/025 ,  C07C273/10

    摘要： An improved process for the removal of urea, ammonia, and carbon dioxide from process condensate derived from coupled urea and ammonia syntheses by hydrolysis of urea and desorption of ammonia and carbon dioxide. Process condensate poor with respect to ammonia is treated at a pressure of between about 15 and 42 bar and a temperature of between about 200.degree. C. and 320.degree. C. in a reaction column with steam to form a gas mixture containing ammonia, carbon dioxide, and water vapor, and an aqueous liquid virtually free of urea, ammonia, and carbon dioxide.

    摘要翻译： 一种改进的方法，用于通过尿素水解和氨和二氧化碳的解吸，从由偶联的脲和氨合成的方法中除去脲，氨和二氧化碳。 相对于氨的处理冷凝物在反应塔中用蒸汽在约15至42巴之间的压力和约200℃至320℃的温度下进行处理，以形成含氨，二氧化碳 和水蒸汽，以及基本上不含尿素，氨和二氧化碳的水性液体。

    Integrated ammonia-urea producing process, for the production of urea
    34.
    发明授权
    Integrated ammonia-urea producing process, for the production of urea 失效
    综合氨尿素生产工艺，用于生产尿素

    公开(公告)号：US4138434A

    公开(公告)日：1979-02-06

    申请号：US857185

    申请日：1977-12-02

    申请人： Vincenzo Lagana ,  Francesco Saviano

    发明人： Vincenzo Lagana ,  Francesco Saviano

    IPC分类号： C01C1/04 ,  C07C67/00 ,  C07C239/00 ,  C07C273/04 ,  C07C273/10 ,  C07C126/02

    CPC分类号： C01C1/0488 ,  C07C273/10 ,  Y02P20/52

    摘要： An improvement of the SNAM ammonia-stripper integrated urea process is disclosed, wherein a gaseous stream obtained by decomposing hydrocarbons is fed to an adiabatic ammonia stripper placed downstream of a carbamate decomposer, the adiabatic stripper also receiving a solution of urea which is rich in ammonia coming from the carbamate decomposer. The thus enriched gaseous stream (NH.sub.3, CO.sub.2, H.sub.2 O) is processed in a CO.sub.2 -absorber (or carbamate reactor) and the process proceeds in the urea synthesis reactor. Recycling and recovery loops are provided between the several reaction and/or decomposing units. Surprisingly, enough, the stripping on NH.sub.3 and CO.sub.2 takes place adiabatically and the drop of the CO.sub.2 partial pressure in the stream fed to the carbamate reactor has no bearing on the efficiency of the carbamate conversion which, according to the current technical teachings, requires an increase of the CO.sub.2 partial pressure.

    摘要翻译： 公开了SNAM氨汽提塔一体化尿素工艺的改进，其中通过分解碳氢化合物获得的气流被送入位于氨基甲酸酯分解器下游的绝热氨汽提器，绝热汽提塔还接收富含氨的尿素溶液 来自氨基甲酸酯分解器。 在CO 2吸收器（或氨基甲酸酯反应器）中处理如此富集的气流（NH 3，CO 2，H 2 O），并且该过程在尿素合成反应器中进行。 在几个反应和/或分解单元之间提供循环和回收循环。 令人惊讶的是，足够的是，在NH 3和CO 2上的汽提是绝热的，并且进料到氨基甲酸酯反应器的流中的二氧化碳分压的下降与氨基甲酸酯转化的效率无关，根据目前的技术教导， 增加二氧化碳分压。