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    CONTROLLING BIURET IN UREA PRODUCTION
    1.
    发明申请
    CONTROLLING BIURET IN UREA PRODUCTION 审中-公开
    控制尿素生产中的隐患

    公开(公告)号：WO2017192031A1

    公开(公告)日：2017-11-09

    申请号：PCT/NL2017/050270

    申请日：2017-04-28

    Applicant: STAMICARBON B.V.

    Inventor： MOSTERT, Eelco

    IPC: C07C273/04 ,  C07C273/16 ,  B01D53/58

    Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production, and particularly reducing, preventing or reversing such formation. This is accomplished by adding liquid ammonia to a urea aqueous stream. This addition is done at one or more positions downstream of a recovery section in a urea plant. The addition of liquid ammonia serves to shift the equilibrium of biuret formation from urea, to the side of the formation of urea from biuret and ammonia. The invention can be accomplished also in pre-existing urea plant, by the simple measure of providing an appropriate inlet for liquid ammonia, in fluid communication with a source of such liquid ammonia.

    Abstract translation: 公开了一种控制尿素生产中缩二脲形成并且特别是减少，防止或逆转这种形成的新方法。 这是通过向尿素水流中加入液氨完成的。 该添加是在尿素工厂的回收段下游的一个或多个位置完成的。 液氨的加入用于将缩二脲形成的平衡从尿素转移到由缩二脲和氨形成脲的一侧。 本发明也可以在预先存在的尿素装置中实现，通过简单的措施提供适合的液氨进口，与液氨的来源流体连通。

    UREA PRODUCTION WITH CONTROLLED BIURET
    2.
    发明申请
    UREA PRODUCTION WITH CONTROLLED BIURET 审中-公开
    尿素生产与控制小瓶

    公开(公告)号：WO2017192032A1

    公开(公告)日：2017-11-09

    申请号：PCT/NL2017/050271

    申请日：2017-04-28

    Applicant: STAMICARBON B.V.

    Inventor： MOSTERT, Eelco

    IPC: B01J19/00 ,  C07C273/04 ,  C07C273/16 ,  B01B1/00

    Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production. This is accomplished by reducing or preventing the formation of biuret in a concentration section, particularly in one or more concentrators or evaporators. The method comprises controlling the residence time of a urea aqueous stream treated in such concentration section in a manner independently of the volume flow per time interval of said stream into said concentration section. The residence time can be controlled, e.g., by providing the concentration section with an adjustable volume or by adding a gas to the urea stream to be treated. A combination of such measures can also be applied.

    Abstract translation: 公开了一种控制尿素生产中缩二脲形成的新方法。 这是通过减少或防止浓缩部分中缩二脲的形成来实现的，特别是在一个或多个浓缩器或蒸发器中。 该方法包括以独立于所述流进入所述浓缩段的每时间间隔的体积流量的方式控制在该浓缩段中处理过的尿素水流的停留时间。 停留时间可以通过例如提供具有可调体积的浓缩部分或通过向要处理的尿素流添加气体来控制。 这些措施的组合也可以应用。

    UREA PRODUCTION WITH CONTROLLED BIURET
    3.
    发明公开
    UREA PRODUCTION WITH CONTROLLED BIURET 审中-公开

    公开(公告)号：EP3452212A1

    公开(公告)日：2019-03-13

    申请号：EP17727404.0

    申请日：2017-04-28

    Applicant: Stamicarbon B.V.

    Inventor： MOSTERT, Eelco

    IPC: B01J19/00 ,  C07C273/04 ,  C07C273/16 ,  B01B1/00

    Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production. This is accomplished by reducing or preventing the formation of biuret in a concentration section, particularly in one or more concentrators or evaporators. The method comprises controlling the residence time of a urea aqueous stream treated in such concentration section in a manner independently of the volume flow per time interval of said stream into said concentration section. The residence time can be controlled, e.g., by providing the concentration section with an adjustable volume or by adding a gas to the urea stream to be treated. A combination of such measures can also be applied.

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