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    • 57. 发明授权
    • Urea prilling
    • 尿素浓缩
    • US3689607A
    • 1972-09-05
    • US3689607D
    • 1970-10-26
    • UNION OIL CO
    • BACKLUND PETER STANLEY
    • B01J2/06C05C1/02C05C9/00
    • C05C9/005B01J2/06C05C1/02
    • Particulate solids of water-soluble, fertilizer materials are prepared by dispersing a substantially anhydrous spray of molten and discrete droplets of the fertilizer material into a liquefied, volatile, cooling medium. Suitable cooling media include liquefied air, nitrogen, ammonia, carbon dioxide, or C1 to about C5 alkanes and halogenated derivatives thereof. The molten fertilizer material is preferably dispersed as discrete droplets having sizes from about 0.04 to about 0.30 inch by spraying the molten material into the liquefied cooling medium. The material is permitted to reside in the cooling medium a sufficient time to cool the material to below its freezing point and thereby form the particulate solids which are thereafter separated from the liquid. Any vaporized liquid can be recovered and refrigerated for reuse in the process. Urea is a preferred fertilizer material.
    • 通过将化肥材料的熔融和离散的液滴的基本上无水的喷雾分散在液化的挥发性冷却介质中来制备水溶性肥料材料的颗粒状固体。 合适的冷却介质包括液化空气,氮气,氨,二氧化碳或C1至C5烷烃及其卤化衍生物。 熔融材料优选通过将熔融材料喷射到液化冷却介质中而以约0.04至约0.30英寸的尺寸分散成分散的液滴。 允许该材料在冷却介质中放置足够的时间以将材料冷却至其凝固点以下,从而形成随后与液体分离的颗粒状固体。 任何蒸发的液体都可以回收并冷藏,以便在此过程中重新使用。 尿素是一种优选的肥料。