Three kind of pure amines which have high solubility of CO₂ were used as absorbents hardly to be recovered. A series of aqueous ethoxyacetate anion-based protic ionic liquids (PILs) with three different amine cations were designed, and physical properties including measured density and viscosity were measured. Solubility of CO₂ in the three PILs solution, 90% [DMAPAH][EOAc], 90% [DEEDAH][EOAc] and 90% [DMEDAH][EOAc], were systematic determined at the range of 303.2-333.2 K under the pressure of 1.2 bar. Impressively, the solubility of CO₂ in 90% [DMAPAH][EOAc] reached up to 2.44 mol/kg, which showed more advantage than some traditional or functional ILs. The 90% [DMAPAH][EOAc] could be reused four times. Besides, the proposed mechanism was advised. Considering the advantages of high absorption capacity, low cost, easy regeneration including fast absorption rate, we believe the three PILs solution can be recommended as alternatives to some volatile organic amines to be applied in CO₂ capture.

具有高CO ₂溶解度的三种纯胺被用作难于回收的吸收剂。设计了一系列具有三种不同胺阳离子的乙氧基乙酸根阴离子水溶液质子离子液体（PIL），并测量了包括测得的密度和粘度在内的物理性能。在303.2-333.2 K范围内，系统确定了CO ₂在三种PIL溶液（90％[DMAPAH] [EOAc]，90％[DEEDAH] [EOAc]和90％[DMEDAH] [EOAc]）中的溶解度。压力为1.2巴。令人印象深刻的是，CO ₂的溶解度90％的[DMAPAH] [EOAc]含量高达2.44 mol / kg，这显示出比某些传统或功能性IL更具优势。90％的[DMAPAH] [EOAc]可重复使用四次。此外，建议了拟议的机制。考虑到高吸收容量，低成本，易于再生（包括快速吸收速率）的优势，我们认为可以推荐使用三种PILs溶液作为用于CO ₂捕集的某些挥发性有机胺的替代品。