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    • 3. 发明授权
    • Process for the removal of acid forming gases from exhaust gases and
production of phosphoric acid
    • 从废气中除去酸性气体和生产磷酸的工艺
    • US5106601A
    • 1992-04-21
    • US518722
    • 1990-05-04
    • Shih-Ger ChangDavid K. Liu
    • Shih-Ger ChangDavid K. Liu
    • B01D53/60
    • B01D53/60
    • Exhaust gases are treated to remove NO or NO.sub.x and SO.sub.2 by contacting the gases with an aqueous emulsion or suspension of yellow phosphorous preferably in a wet scrubber. The addition of yellow phosphorous in the system induces the production of O.sub.3 which subsequently oxidizes NO to NO.sub.2. The resulting NO.sub.2 dissolves readily and can be reduced to form ammonium ions by dissolved SO.sub.2 under appropriate conditions. In a 20 acfm system, yellow phosphorous is oxidized to yield P.sub.2 O.sub.5 which picks up water to form H.sub.3 PO.sub.4 mists and can be collected as a valuable product. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50.degree. C. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NO.sub.x and SO.sub.2, alkalis that are used for flue gas desulfurization are preferred. With this process, better than 90% of SO.sub.2 and NO in simulated flue gas can be removed. Stoichiometric ratios (P/NO) ranging between 0.6 and 1.5 were obtained.
    • 通过使气体与水性乳液或黄磷的悬浮液接触,优选在湿式洗涤器中处理废气以除去NO或NO x和SO 2。 在系统中加入黄色磷诱导O3的产生,其随后将NO氧化成NO 2。 所得的NO 2容易溶解并且可以在合适的条件下通过溶解的SO 2还原形成铵离子。 在20 acfm系统中,黄磷被氧化产生P2O5,其吸收水以形成H 3 PO 4雾,并且可以作为有价值的产物收集。 压力并不重要,并且使用环境压力。 热水温度最好,但经济学表明约为50℃。所用的黄磷量将随着废气的组成而变化,对于小浓度的NO,小于3%,高于1000的浓​​度为10%以上 ppm。 类似地,pH将随待处理的组合物而变化,并用合适的碱调节。 对于NOx和SO 2的混合物,优选用于烟道气脱硫的碱。 通过这个过程,可以去除模拟烟道气中优于SO2和NO的90%。 化学计量比(P / NO)为0.6〜1.5。