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    • 6. 发明申请
    • Process and Plant for the Production of an Aqueous Solution Comprising Urea
    • 用于生产包含尿素的水溶液的方法和设备
    • US20100140543A1
    • 2010-06-10
    • US12525655
    • 2008-01-30
    • Federico Zardi
    • Federico Zardi
    • C09K3/00B01J19/00B23P11/00
    • C07C273/16B01D2251/2062B01J2219/00024Y10T29/49826
    • The present invention regards a process for the production of an aqueous solution comprising urea for use in the removal of nitrogen oxides from combustion gas or fumes, the process being characterised in that it comprises the steps of: -subjecting at least a part of a urea-concentrated aqueous solution comprising residual free ammonia, obtained directly from or downstream of a recovery section of a plant for the production of urea, to washing with carbon dioxide, so obtaining a first vapour phase comprising carbon dioxide and optionally ammonia and a urea-concentrated aqueous solution comprising carbamate and essentially lacking in free ammonia, and -diluting said urea-concentrated aqueous solution comprising carbamate and essentially lacking in free ammonia with water until the desired concentration of urea in aqueous solution is reached.
    • 本发明涉及用于生产包含尿素的水溶液的方法,该方法用于从燃烧气体或烟气中除去氮氧化物,该方法的特征在于其包括以下步骤: - 将至少一部分尿素 包含残余游离氨的浓缩水溶液,其直接从用于生产尿素的设备的回收部分的下游获得,用二氧化碳洗涤,从而获得包含二氧化碳和任选的氨的第一气相和尿素浓缩 包含氨基甲酸酯并且基本上不含游离氨的水溶液,并且用水稀释所述包含氨基甲酸酯并且基本上不含游离氨的尿素浓缩水溶液,直到达到所需浓度的尿素在水溶液中。
    • 8. 发明授权
    • Method for modernizing a urea production plant
    • 尿素生产设备现代化的方法
    • US06702992B2
    • 2004-03-09
    • US09881099
    • 2001-06-15
    • Giorgio PaganiFederico Zardi
    • Giorgio PaganiFederico Zardi
    • B01J804
    • C07C273/04B01D5/0012B01D5/0081B01J19/2425B01J2219/00024B01J2219/00081B01J2219/00159Y02P20/582
    • A method for the modernization of a plant for urea production of the type comprising a reactor (2) for urea synthesis, a stripping unit (3) with carbon dioxide and at least one vertical condensation unit (4) of the film type, foresees the provision of means (36) for feeding a major portion of a flow comprising ammonia and carbon dioxide in vapor phase leaving the stripping unit (3) to the condensation unit (4) and the provision in said condensation unit (4) of means (37) for subjecting to substantially total condensation such major portion of the flow comprising ammonia and carbon dioxide in vapour phase, obtaining a flow comprising urea and carbamate in aqueous solution, then fed to the reactor (2) for urea synthesis. Thanks to the present method of modernisation, the efficiency of the condensation unit (4) is remarkably improved, thus permitting an increase of its capacity.
    • 用于尿素生产用于尿素生产的设备的现代化方法包括用于尿素合成的反应器(2),具有二氧化碳的汽提单元(3)和膜类型的至少一个垂直冷凝单元(4),其预期为 提供用于将气流中包含氨和二氧化碳的大部分流动供给到冷凝单元(4)的装置(36),并且在所述冷凝单元(4)中提供装置(37) ),以使气相中含有氨和二氧化碳的大部分流动基本上完全冷凝,得到包含尿素和氨基甲酸酯在水溶液中的流动,然后送入反应器(2)进行尿素合成。 由于现代化的现代化方法,冷凝单元(4)的效率显着提高,从而允许其容量增加。