New absorbents composed of diethylene glycol monobutyl ether (DGBE), paraffin oil, and ionic liquids (ILs) were prepared for the removal of gaseous acetone. Three ILs, namely, [bmim][PF6], [bmim][BF4], and [bmim][Ac], were used to regulate the absorption performance. Different paraffin oil mass fractions and IL mass fractions were applied to determine the right formula with suitable physical properties and absorption performance. The Henry coefficients of acetone in the absorbents were measured to evaluate the influence of absorbent composition on the absorption capacity. The removal performances of these absorbents were investigated in a bubbling bottle to evaluate the combined impact of Henry coefficient and physical properties.

Dual amino functionalized ionic liquid tetramethylammonium lysinate ([N1111]­[Lys]) was synthesized and mixed with 2-[2-(dimethylamino)­ethoxy]­ethanol (DMEE) to obtain a series of nonwater absorbents for CO2 capture. The density and viscosity of the IL hybrids were measured. Using dual-vessel absorption system, CO2 absorption capacity and rate were investigated over a wide range of IL mass fractions (5–100%) to evaluate the influence of DMEE content, and 20% was chosen for further studies including influences of temperature and regeneration performances. Mass transfer coefficients with constant absorption area were calculated from apparent absorption rate constant. Fourier transform infrared (FT-IR) and 13C NMR spectra were applied to indicate the absorption process and mechanism. This new nonwater mixed system was proved to have high absorption capacities and prominent regeneration efficiency under mild conditions (80 °C).

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