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    • 7. 发明申请
    • METHOD OF MAKING A UREA PRODUCT
    • 制造尿素产品的方法
    • WO2016010432A1
    • 2016-01-21
    • PCT/NL2015/050523
    • 2015-07-16
    • STAMICARBON B.V.
    • MENNEN, Johannes Henricus
    • B01D9/00C07C273/16C07C275/02
    • C07C273/16B01D9/0022B01D21/262C07C275/02
    • Disclosed is a process for the preparation of a urea product suitable for being diluted with water so as to form an aqueous urea comprising solution for use in a unit for the reduction of NOx in combustion engine exhaust gases, also known as Diesel Exhaust Fluid (DEF) or to be used in De NOx systems of exhaust vapor from industrial furnaces. The process comprises obtaining an aqueous urea solution from or after a recovery section in a urea production process. This solution, which has a low content of impurities, is subjected to flash crystallization at a low pressure, so as to obtain a solid crystallized urea containing product, which is a free-flowing powder containing less than 0.2 wt.% water. This product is packaged under conditions such that the water content in the packaged product is maintained below 0.2 wt.%. The invention can also be used in a method of increasing the capacity of an existing urea plant.
    • 公开了一种用于制备适于用水稀释的尿素产品的方法,以形成用于减少内燃机废气中的NOx的单元中的含水尿素,其也被称为柴油排放液(DEF )或用于来自工业炉的废气蒸气的De NOx系统。 该方法包括在尿素生产过程中从回收部分中或之后获得尿素水溶液。 这种具有低杂质含量的溶液在低压下进行闪蒸结晶,从而获得含有小于0.2重量%水的自由流动粉末的固体结晶含尿素产品。 该产品在包装产品中的含水量保持在0.2重量%以下的条件下包装。 本发明也可用于增加现有尿素装置的容量的方法。