The removal of CO₂ and H₂S from a gas by absorption with an aqueous alkanolamine solution is an energy-intensive process. The addition of a physical cosolvent might lower the regeneration energy but also affects the thermodynamics and kinetics of acid gas absorption. In this work, we study the impact on the thermodynamics and kinetics of CO₂ and H₂S absorption of the addition of 1,3-dimethyl-2-imidazolidinone (DMI) to the aqueous 2-(2-diethylaminoethoxy)ethanol (DEAE-EO) solvent. A comparison is made with the impact of DMI on an aqueous methyldiethanolamine (MDEA) solvent. In all cases, DMI reduced the solubility and the absorption rate of the acid gases. DMI also reduced the initial kinetic H₂S/CO₂ selectivity, although this effect seems much more pronounced in aqueous MDEA than in aqueous DEAE-EO. The equilibrium thermodynamic H₂S/CO₂ selectivity is higher in the presence of DMI.

中文翻译：

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酸性气体的吸收：2-（2-二乙基氨基乙氧基）乙醇和 1,3-二甲基-2-咪唑烷酮水溶液的热力学和动力学方面的评价


通过用烷醇胺水溶液吸收从气体中去除 CO₂ 和 H₂S 是一个能源密集型过程。添加物理助溶剂可能会降低再生能，但也会影响酸性气体吸收的热力学和动力学。在这项工作中，我们研究了向 2-（2-二乙氨基乙氧基）乙醇 （DEAE-EO） 溶剂中添加 1,3-二甲基-2-咪唑烷酮 （DMI） 对 CO₂ 和 H₂S 吸收的热力学和动力学的影响。与 DMI 对甲基二乙醇胺 （MDEA） 水溶液 （MDEA） 的影响进行了比较。在所有情况下，DMI 都降低了酸性气体的溶解度和吸收率。DMI 还降低了初始动力学 H₂S/CO₂ 选择性，尽管这种影响在 MDEA 水性中似乎比在 DEAE-EO 水性中更明显。在 DMI 存在下，平衡热力学 H₂S/CO₂ 选择性更高。