Process for absorption of sulfur dioxide and nitric oxide from flue gas
    1.
    发明授权
    Process for absorption of sulfur dioxide and nitric oxide from flue gas 失效
    从烟道气中吸收二氧化硫和一氧化氮的方法

    公开(公告)号:US5320816A

    公开(公告)日:1994-06-14

    申请号:US964323

    申请日:1992-10-21

    摘要: The simultaneous abatement of NO and SO.sub.2 in flue gas is provided by an absorption process and apparatus utilizing an absorbent composition comprising an aqueous solution of chelates and sulfite salts. Metal chelates oxidized to an inactive state are electrochemically reduced. In the electrochemical cell, nickel or stainless steel anode materials are stable and may be used in the place of platinum coated anode materials when the anolyte pH is maintained greater than 12. At these conditions, the anode is corrosion resistant with a long operating time between replacement. Ultrafiltration or Donnan dialysis may be used to separate the chelate sorbents from the waste salts to reduce the loss of expensive chelate sorbents. Alternatively, an anionic exchange membrane can be used to electrodialytically separate waste sulfur/nitrogen salts from the absorbent solution.

    摘要翻译: 通过吸收方法和使用包含螯合物和亚硫酸盐的水溶液的吸收剂组合物的装置来提供烟道气中的NO和SO 2的同时减少。 氧化成无活性状态的金属螯合物电化学还原。 在电化学电池中,当阳极电解液pH保持大于12时,镍或不锈钢阳极材料是稳定的,并且可以用于代替铂涂覆的阳极材料。在这些条件下,阳极是耐腐蚀的,具有长的操作时间 替代。 可以使用超滤或Donnan透析法将螯合吸附剂与废盐分离,以减少昂贵螯合吸附剂的损失。 或者,阴离子交换膜可用于电离渗析从废吸收剂溶液中分离废硫/氮盐。