AIChE Journal, Vol.64, No.1, 209-219, 2018
Protic ionic liquid as excellent shuttle of MDEA for fast capture of CO2
A cheap protic ionic liquid (PIL), 3-(Dimethylamino)-1-propylamine acetate (abbreviated as [DMAPAH][Ac]), is investigated in this work as the activator of N-methyldiethanolamine (MDEA) for fast capture of CO2. The PIL-activated MDEA solutions show excellent performance in absorption rate and capacity (2.5 molkg(-1)). A novel absorption mechanism is proposed to account for the phenomenon, where the shuttling role of the PIL is described in detail. Additionally, the enthalpy change H-SOL (-45 to -52 kJmol(-1)), the turnover number of the PIL and the regeneration efficiency (>92%) are also measured. All these data show that the PIL-mediated MDEA solutions may be used as a kind of promising absorbents for fast capture of CO2. (c) 2017 American Institute of Chemical Engineers AIChE J, 63: 209-219, 2018