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    • 20. 发明授权
    • Process for nitrogen oxide waste conversion to fertilizer
    • 氮氧化物废物转化为肥料的过程
    • US06641638B1
    • 2003-11-04
    • US09511634
    • 2000-02-17
    • Dale E. LueckClyde F. Parrish
    • Dale E. LueckClyde F. Parrish
    • C01B2148
    • B01D53/56C01D9/06C05C5/02
    • The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at least one nitrogen-containing oxidizing agent to a first contact zone, b) contacting said vapor stream with water to form nitrogen oxide(s) from said at least one nitrogen-containing oxidizing agent, c) directing said acid(s) as a second stream to a second contact zone, d) exposing said second stream to hydrogen peroxide which is present within said second contact zone in a relative amount of at least 0.1% by weight of said second stream within said second contact zone to convert at least some of any nitrogen oxide species or ions other than in the nitrate form present within said second stream to nitrate ion, e) sampling said stream within said second contact zone to determine the relative amount of hydrogen peroxide within said second contact zone, f) adding hydrogen peroxide to said second contact zone when a level of hydrogen peroxide less than 0.1% by weight in said second stream is determined by said sampling, g) adding a solution comprising potassium hydroxide to said second stream to maintain a pH between 6.0 and 11.0 within said second stream within said second contact zone to form a solution of potassium nitrate, and h) removing said solution of potassium nitrate from said second contact zone.
    • 本发明描述了一种将来自其中含有至少一种含氮氧化剂的源的蒸汽流转化为液体肥料组合物的方法,包括以下步骤:a)将含有至少一种含氮氧化剂的蒸气流引导至第一 接触区,b)使所述蒸气流与水接触以从所述至少一种含氮氧化剂形成氮氧化物,c)将所述酸作为第二流引导到第二接触区,d)暴露 所述第二物流以所述第二接触区内所述第二物流的至少0.1重量%的相对量存在于所述第二接触区内,以转化除所述第二接触区之外的任何氮氧化物种类或离子中的至少一些 存在于所述第二流内的硝酸盐形式为硝酸根离子,e)在所述第二接触区内采样所述流,以确定所述第二连续过程中的过氧化氢的相对量 f)当所述第二料流中小于0.1重量%的过氧化氢水平通过所述取样确定时,向所述第二接触区域中加入过氧化氢,g)向所述第二料流中加入包含氢氧化钾的溶液以维​​持 在所述第二接触区内的所述第二流内的pH在6.0和11.0之间,以形成硝酸钾溶液,和h)从所述第二接触区中除去所述硝酸钾溶液。