Aqueous amine solutions are the most used solvents for chemical absorption of CO₂. Substituting part of the water by organic solvents in aqueous amine solutions aims to take advantage of the lower partial pressure and higher CO₂ solubility. In this work, the influence of four organic solvents on solution density, viscosity, N₂O solubility and absorption kinetics are studied. The organic solvents, Monoethylene Glycol (MEG), Diethylene Glycol (DEG), Triethylene Glycol (TEG) and CARBITOL, are blended with two amine solutions: MEA and DEEA-MAPA blend. The results show that the addition of organic solvents increases the density and viscosity. Furthermore, the N₂O solubility, used to estimate the physical solubility of CO₂ into a reactive system, increases when part of the water is substituted with an organic solvent. The kinetic experiments with a double stirred cell showed that in case of aqueous 5 M MEA, the substitution of part of the water increases both the mass transfer and kinetic coefficients of the CO₂, whereas the substitution in the 3M DEEA + 2M MAPA solution was not that favorable and only the substitution of MEG showed enhancement on the mass transfer and kinetic coefficients over the whole temperature range studied. The results can be partly explained by the changes in viscosity and N₂O solubility in the different systems, since the viscosity of the MEA organic solvent blends is lower compared to that of DEEA + MAPA blends and have less negative influence on the kinetics. At the same time, the increase of N₂O solubility in the MEA blends is much higher than in DEEA + MAPA blends, resulting in more CO₂ available to react. Finally, the kinetic coefficients results are discussed together with dielectric constant of the dilution media.

胺水溶液是化学吸收CO ₂的最常用溶剂。在胺水溶液中用有机溶剂代替部分水的目的是要利用较低的分压和较高的CO ₂溶解度。在这项工作中，研究了四种有机溶剂对溶液密度，粘度，N ₂ O溶解度和吸收动力学的影响。将有机溶剂单乙二醇（MEG），二乙二醇（DEG），三乙二醇（TEG）和CARBITOL与两种胺溶液共混：MEA和DEEA-MAPA共混物。结果表明，加入有机溶剂可增加密度和粘度。此外，N ₂ O溶解度用于估算CO ₂的物理溶解度当部分水被有机溶剂取代时，其反应性增加。使用双搅拌池的动力学实验表明，在5 M MEA水溶液中，部分水的替代会增加CO ₂的传质和动力学系数，而在3M DEEA + 2M MAPA溶液中的替代是并非如此，仅MEG的取代在整个研究温度范围内都显示出传质和动力学系数的增强。粘度和N ₂的变化可以部分解释结果。在MEA中的溶解度不同，因为MEA有机溶剂共混物的粘度比DEEA + MAPA共混物的粘度低，并且对动力学的负面影响较小。同时，MEA共混物中N ₂ O溶解度的增加远高于DEEA + MAPA共混物中N ₂ O溶解度的增加，从而导致更多可用于反应的CO ₂。最后，讨论了动力学系数的结果以及稀释介质的介电常数。