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    Preparation of urea in combination with the synthesis of ammonia
    1.
    发明授权
    Preparation of urea in combination with the synthesis of ammonia 失效
    尿素与氨基酸合成的组合制备

    公开(公告)号：US3647872A

    公开(公告)日：1972-03-07

    申请号：US3647872D

    申请日：1968-12-23

    Applicant: STAMICARBON

    Inventor： KAASENBROOD PETRUS J C ,  TAKS GERARDUS J J M

    IPC: C01C1/04 ,  C07C273/10 ,  C07C127/00

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

    Abstract: A PROCESS FOR THE MANUFACTURE OF UREA FROM AMMONIA AND CARBON DIOXIDE IS DESCRIBED WHEREIN A TECHNIQUE FOR REDUCING THE AMOUNT OF INERT GASES SUPPLIED TO UREA REACTOR IS UTILIZED. THIS TECHNIQUE INVOLVES FIRST ABSORBING THE AMMONIA FROM THE AMMONIA SYNTHESIS GAS MIXTURE (CONTAINING AMMONIA, HYDROGEN AND NITROGEN) IN A SUITABLE SOLVENT (WATER, OR AN AQUEOUS SOLUTION IN WHICH AMMONIA IS READILY ABSORBED), AND THEREAFTER DESORBING THE AMMONIA IS READILY ABSORBED), AND THEREAFTER DESORBING THE AMMONIA CONTENT OF THE ABSORBENT SOLUTION IN A SUITABLE GAS STREAM, THE DESORPTION BEING CONDUCTED IN SUCH A WAY THAT THE AMMONIA CONTENT OF THE DESORBED GAS MIXTURE IS MAINTAINED SUFFICIENTLY HIGH THAT A RELATIVELY MUCH SMALLER VOLUME OF INERT GASES ARE THEREBY INTRODUCED INTO THE UREA SYNTHESIS REACTOR.

    Integrated process for the preparation of urea and melamine
    3.
    发明授权
    Integrated process for the preparation of urea and melamine 失效
    用于制备尿素和梅拉米的综合方法

    公开(公告)号：US3697521A

    公开(公告)日：1972-10-10

    申请号：US3697521D

    申请日：1970-12-15

    Applicant: STAMICARBON

    Inventor： NASSAU PETRUS J M VAN ,  BRAND WILHELMUS K ,  KAASENBROOD PETRUS J C

    IPC: C07D251/60 ,  C07C67/00 ,  C07C239/00 ,  C07C273/12 ,  C07D55/28

    CPC classification number: C07C273/12 ,  Y02P20/125

    Abstract: An integrated process for the preparation of urea and melamine is described wherein heat requirements for the decomposition of ammonium carbamate contained in the urea product solution, which is cycled as feed to the melamine synthesis stage, is supplied, at least in part, from the heat released by the desublimation of the melamine vapors obtained in the melamine synthesis gas product stream, by bringing this gas stream into direct contact, either in counter-current or co-current flow, with the ammonium carbamate-containing urea product solution.

    Abstract translation: 描述了一种用于制备尿素和三聚氰胺的综合方法，其中包含在作为进料至三聚氰胺合成阶段的尿素产物溶液中的氨基甲酸铵分解的热需求至少部分地从热量 通过在三聚氰胺合成气产物流中获得的三聚氰胺蒸汽的释放，通过使该气流以逆流或并流流动与含氨基甲酸铵的尿素产物溶液直接接触释放。

    Process for preparing melamine from urea
    6.
    发明授权
    Process for preparing melamine from urea 失效
    从尿素制备梅来胺的方法

    公开(公告)号：US3682911A

    公开(公告)日：1972-08-08

    申请号：US3682911D

    申请日：1969-02-03

    Applicant: STAMICARBON

    Inventor： KAASENBROOD PETRUS J C ,  NASSAU PETRUS J M VAN

    IPC: B65D39/02 ,  C07D251/60 ,  C07D55/28

    CPC classification number: C07D251/60 ,  B65D39/02 ,  Y02P20/125

    Abstract: An integrated process for the manufacture of melamine in combination with the manufacture of urea is disclosed, wherein the urea product from the urea synthesis unit is used as feed to the melamine synthesis unit. In the process described, the ammonia and carbon dioxide by-products from the melamine plants are processed by condensing the same to form a dilute solution of ammonium carbamate and ammonia and desorbing the resulting solution at urea synthesis pressures, to release a major part of the carbon dioxide, and passing the resulting gaseous mixture containing ammonia and carbon dioxide with only small amounts of water vapor directly to the high pressure urea synthesis unit. Procedures for suitably recovering and using the heat energy released during the various chemical reactions and evaporation steps are also described.

    Abstract translation: 公开了一种用于制造三聚氰胺与尿素制造的综合方法，其中来自尿素合成单元的尿素产物用作三聚氰胺合成单元的进料。 在所描述的方法中，来自三聚氰胺植物的氨和二氧化碳副产物通过将其缩合形成氨基甲酸铵和氨的稀溶液并在尿素合成压力下解吸所得溶液，以释放主要部分的 二氧化碳，并将含有氨和二氧化碳的所得气体混合物仅用少量水蒸气直接送至高压尿素合成装置。 还描述了适当回收和使用在各种化学反应和蒸发步骤期间释放的热能的方法。

    Process for separating off melamine from a hot synthesis gas mixture which contains melamine vapor
    10.
    发明授权
    Process for separating off melamine from a hot synthesis gas mixture which contains melamine vapor 失效
    从含有蒸馏水的热合成气混合物中分离出甲酚的方法

    公开(公告)号：US3697519A

    公开(公告)日：1972-10-10

    申请号：US3697519D

    申请日：1970-12-09

    Applicant: STAMICARBON

    Inventor： KAASENBROOD PETRUS J C

    IPC: C07D251/60 ,  C07C20060101 ,  C07D20060101 ,  C07D251/62 ,  C07D55/24

    CPC classification number: C07D251/62

    Abstract: A process relating to the separation of melamine from hot synthesis gas mixtures is described, wherein such gases are contacted directly with a urea melt containing ammonium carbamate, so that the desublimation heat released as the melamine is converted from the vapor to the solid state is utilized for the decomposition of the ammonium carbamate to release ammonia and carbon dioxide.

    Abstract translation: 描述了与热合成气混合物分离三聚氰胺的方法，其中这种气体与含有氨基甲酸铵的尿素熔体直接接触，从而利用三聚氰胺从蒸汽转化成固体状态释放的散发热 用于分解氨基甲酸铵以释放氨和二氧化碳。

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