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    Method and apparatus for synthesizing urea
    7.
    发明公开
    Method and apparatus for synthesizing urea 有权
    Verfahren und Apparat zur Herstellung von Harnstoff

    公开(公告)号：EP1728783A1

    公开(公告)日：2006-12-06

    申请号：EP06010803.2

    申请日：2006-05-26

    申请人： TOYO ENGINEERING CORPORATION

    发明人： Kojima, Yasuhiko

    IPC分类号： C07C273/04 ,  B01J19/00

    CPC分类号： C07C273/04 ,  B01J2219/00006

    摘要： In a process and an apparatus for synthesizing urea which synthesize urea from ammonia and carbon dioxide, the operating condition can be grasped easily and with good accuracy. A process for synthesizing urea which includes: a reaction step of obtaining a urea synthesis solution which contains urea, unreacted ammonia, unreacted carbon dioxide and water by causing ammonia and carbon dioxide to react with each other; a stripping step of separating a gas mixture containing the unreacted ammonia and the unreacted carbon dioxide by stripping the urea synthesis solution by using at least a portion of raw material carbon dioxide; a condensing step of obtaining a condensed liquid by condensing the gas mixture in an absorbing medium while cooling the gas mixture; a recycling step of recycling the condensed liquid to the reaction step; and a step of measuring the density of the condensed liquid online. An apparatus for carrying out this process is provided.

    摘要翻译： 在从氨和二氧化碳合成尿素的合成尿素的方法和装置中，可以容易且准确地掌握操作条件。 一种合成尿素的方法，包括：通过使氨和二氧化碳相互反应获得含有尿素，未反应氨，未反应的二氧化碳和水的尿素合成溶液的反应步骤; 通过使用至少一部分原料二氧化碳汽提尿素合成溶液来分离含有未反应氨和未反应二氧化碳的气体混合物的汽提步骤; 冷凝步骤，在冷却气体混合物的同时，通过在吸收介质中冷凝气体混合物来获得冷凝液体; 回收步骤，将冷凝的液体再循环到反应步骤; 以及在线测量浓缩液体的密度的步骤。 提供了一种用于执行该过程的装置。

    Process for the synthesis of urea
    10.
    发明公开
    Process for the synthesis of urea 有权
    Verfahren zur Herstellung von Harnstoff

    公开(公告)号：EP1203765A2

    公开(公告)日：2002-05-08

    申请号：EP01125270.7

    申请日：2001-10-24

    申请人： Toyo Engineering Corporation ,  PT Pupuk Sriwidjaja

    发明人： Yoshida, Kinichi ,  Yoshimoto, Kenji ,  Kojima, Yasuhiko

    IPC分类号： C07C273/04

    CPC分类号： C07C273/04

    摘要： A urea synthesis process with improved heat economy, wherein a urea synthesis solution obtained by removing most of the unreacted ammonium carbamate by stripping with carbon dioxide at a pressure approximately equal to a urea synthesis pressure is subjected to a high and low pressure decomposition. The gas mixture obtained from the high-pressure decomposition is condensed in at least two steps. Gases obtained from the stripping of the urea synthesis solution, after an initial condensation may be alternatively routed into the high-pressure decomposition column thus facilitating the decomposition of unreacted ammonium carbamate; may be mixed with off-gases from the high-pressure decomposition column and routed to an indirect heat-exchanger for concentrating the aqueous urea solution and facilitating the condensation of the off-gases from the high pressure decomposition column; or may be routed to a condenser for the gas mixture obtained from the high-pressure decomposition after it has underwent indirect heat-exchange with the aqueous urea solution, thus facilitate the further condensation of these gases.

    摘要翻译： 具有改善的热效率的尿素合成方法，其中通过用几乎等于尿素合成压力的压力用二氧化碳汽提除去大部分未反应的氨基甲酸铵而获得的尿素合成溶液经受高低压分解。 从高压分解得到的气体混合物至少两个步骤冷凝。 在初始冷凝之后从汽提尿素合成溶液获得的气体可以替代地引入高压分解塔中，从而促进未反应的氨基甲酸铵的分解; 可以与来自高压分解塔的废气混合，并送到间接热交换器，用于浓缩尿素水溶液并促进来自高压分解塔的废气的冷凝; 或者可以在与尿素水溶液进行间接热交换之后，将其从高压分解获得的气体混合物送至冷凝器，从而促进这些气体的进一步冷凝。