Fe^(2+)EDTA液相对NO的络合作用  

Complexing NO with Fe^(2+)EDTA aqueous solution

作　　者：马乐凡[1] 尹奇德[1] 郭振华[1] 宋剑飞[1] 

机构地区：[1]长沙理工大学化学与环境工程学院,湖南长沙410076

出　　处：《生态环境》2007年第1期26-30,共5页Ecology and Environmnet

基　　金：湖南省自然科学基金项目(06JJ50085)

摘　　要：对Fe^(2+)EDTA溶液络合NO过程的影响因素的探讨,是“液相络合-铁还原-酸吸收”回收法脱除烟气中NOx技术研究的基础。用鼓泡反应器和模拟烟气,在实验室研究了Fe2+EDTA溶液络合NO的过程,探讨了Fe2+EDTA溶液络合NO过程的影响因素,以及该过程的反应平衡常数。结果表明:Fe2+EDTA溶液对NO的络合能力随时间延长而减弱;Fe2+EDTA溶液对NO的络合容量随着烟气中O2含量的增加和络合温度的升高而降低,随络合液中Fe2+EDTA浓度增加而呈直线增加;pH值为8左右时,Fe2+EDTA溶液对NO的络合容量最大;Fe2+EDTA溶液络合NO的反应平衡常数在实验条件下为105~106L·mol-1数量级,其值随温度升高而降低。Research of the influencing parameters of complexing NO with Fe^2＋EDTA aqueous solution is the basic for the new recovery process of removal of NOx from flue gas with the sequence of complexing in Fe^2＋EDTA aqueous solution followed reduction with iron powder and absorption with acids. Experiments were carried out with bubble columns and simulated flue gas in laboratory. The parameters and equilibrium constant of the complex process were investigated. The results show that capacity of complexing NO of absorption solution weakens with increasing absorption time. The capacity decreases with increasing O2 content in the flue gas and raising complex temperature, and it increases linearly with increasing the Fe^2＋EDTA concentration of the absorption solution. The maximum capacity can be obtained at about pH 8 of the absorption solution. The equilibrium constant of the complex reaction ranges from 10^5 L·mol^-1 to 10^6 L·mol^-1, and its value decreases with raising reaction temperature.

关 键 词：氮氧化物 液相络合 影响因素 平衡常数 

分 类 号：X131.1[环境科学与工程—环境科学]