Fe(Ⅱ)-EDTA吸收一氧化氮动力学研究

本文提出一种用Fe(Ⅱ)-EDTA溶液同时脱除硝酸尾气中NO_x和合成氨原料气中H_2S的方法,并对Fe(Ⅱ)-EDTA溶液吸收一氧化氮动力学进行了研究.根据络合反应:NO+Fe(Ⅱ)-EDTA(?)Fe(Ⅱ)(NO)EDTA属快速(2,1)级可逆反应的特点,建立起适合于一般形式A+B(?)E的快速(2,1)级可逆反应宏观吸收动力学数学模型,并和现有的其它模型进行比较.将所导出的数学模型与所测得的Fe(Ⅱ)-EDTA吸收NO动力学实验数据拟合,采用Marquardt法搜索、选优,求得Fe(Ⅱ)-EDTA吸收NO动力学关系式.文章还提出了测定数学模型中各个物性参数的实验方法.

The Kinetics of NO Absorption into Aqueous Fe(II)-EDTA Solution

A process for the simultaneous absorption of NO (from nitric acid plant emissions) and H2S(from coal gas produced in synthetic ammonia plants) in aqueous Fe(II)-EDTA solution was proposed. The kinetics of absorption of NO in aqueous Fe(II)-EDTA solution was studied. It was found that the reaction was rather complicated: NO +Fe(II) - EDTA = Fe(II) (NO) EDTA, and was a second order reaction with respect to the forward reaction and first order with respect to the reverse reaction. The mechanism of the absorption process was discussed, the mathematical model describing the absorption process of(2,l)order fast reversible reaction: A + B = E, was established, and compared with other mathematical models describing the same system. Data from kinetic experiments of NO absorption in aqueous Fe(II)-EDTA solution correlated well with the mathematical model presented by the authors. The Marquardt Method was used to get optimum values for calculations. A kinetic equation of NO absorption in aqueous Fe(II)-EDTA solution was finally established.