铁基离子液体/NHD吸收氧化H2S的反应动力学

Dynamic Study of Oxidative Desulfurization by Iron-based Ionic Liquids/NHD

以铁基离子液体(Fe-IL)/聚乙二醇二甲醚(NHD)为脱硫体系,通过静态吸收反应装置研究了共溶体系吸收氧化H2S的动力学过程。结果表明,纯Fe-IL脱硫体系的动力学方程可表示为r=54. 62 exp(-11720/RT)·cH2S·cFe(Ⅲ),Fe-IL/NHD吸收氧化H2S属于快速拟一级反应,复配NHD后,对Fe(Ⅲ)的反应级数随NHD复配比的增大而增大,提高温度和NHD的复配比可强化传质过程,提高脱硫过程的反应速率。

The addition of organic solvents in iron-based ionic liquids( Fe-IL) enhances the gas-liquid mass transfer of hydrogen sulfide( H2S) during desulfurization,which can significantly improve the desulfurization efficiency. Definitely,the addition of organic solvents must has a certain influence on the dynamic properties of the desulfurization system. The dynamic properties of H2S absorption in the co-solution desulfurization system of Fe-IL/NHD( polyethylene glycol dimethyl ether) in a static absorption reactor was studied. The results show that the dynamic equation of pure Fe-IL desulfurization system is r = 54. 62 exp(-11720/RT) ·cH2S·cFe( Ⅲ),and the absorption and oxidation of H2S by Fe-IL/NHD is a fast pseudo-first order reaction. After mixing with NHD,the reaction order of Fe( Ⅲ) increases with the increase of the ratio of NHD to Fe-IL. Thus increasing reaction temperature and the ratio of NHD to Fe-IL can enhance the mass transfer process and the reaction rate during the desulfurization process.