Abstract
The CO2 desorption performance of N-methyldiethanolamine(MDEA)-Tetramethylammonium glycinate ([N1111][Gly]), MDEA-1-butyl-3-methylimidazolium lysinate ([Bmim][Lys]) aqueous solutions was investigated. The influences of amino acid ionic liquids (AAILs) type and AAILs concentration on CO2 desorption were demonstrated on the basis of experiments. The corrosion characteristics of 20# carbon steel in the MDEA-AAILs-CO2 aqueous solutions were also determined, and the effects of temperature, AAILs concentration, AAILs type, and CO2 loading on the corrosion rate were analyzed. Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance carbon spectroscopy (13C NMR) and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) characterization were used to evaluate the CO2 desorption mechanism and corrosion mechanism, respectively. It is found that AAILs have a good performance in the desorption process and they can effectively reduce the corrosion rate of amine aqueous solution.
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