复配型铁基离子液体氧化脱除H2S动力学研究

Kinetics study of oxidation removal of H2S by compound iron-based ionic liquids

在自建的小型实验室脱硫装置,实验筛选出了最优的弱碱性物理吸附溶剂N-甲基吡咯烷酮(NMP),然后与铁基离子液体(Fe-IL)组成脱硫复配系统。在静态高压反应釜内,研究了Fe-IL复配体系对H2S脱除性能,建立相应H2S氧化反应动力学模型。结果表明:Fe-IL/NMP复配体系脱硫后溶液增重是纯Fe-IL的4.3倍;复配体系对H2S的吸收为快速拟一级反应,脱硫过程主要受液膜控制,提高温度及NMP的复配比,可强化对H2S的吸收;通过温度、压力、溶液复配比对吸收速率的影响实验,确定了脱硫反应指前因子A为21.26,活化能Ea为12.19kJ/mol;利用化学动力学模型,最终建立了相关化学吸收速率方程。

In a self-built small laboratory desulfurization unit, the optimal weak alkaline physical adsorption solvent Nmethylpyrrolidone(NMP) was selected, and then combined with iron-based ionic liquid(Fe IL) to form a desulfurization system. In a static high-pressure reactor, the performance of Fe IL/NMP compound system for H2S removal was studied, and the corresponding kinetic model of H2S oxidation was established. The results show that the solution mass gain of Fe IL/NMP compound system after desulfurization is 4.3 times of that of pure Fe IL. The absorption of H2S by the compound system is a fast pseudo first-order reaction,and the desulfurization process is mainly controlled by the liquid film, and the absorption of H2S can be enhanced by increasing the temperature and the compounding ratio of NMP. Through the experiments of the influence of temperature, pressure and solution compounding ratio on the absorption rate, the index factor A and activation energy Ea of desulfurization reaction were determined to be 21.26 and 12.19 kJ/mol, respectively, and the relevant chemical absorption rate equation was established by using the chemical kinetics model.