Preparation and CO2 capture experiment of amino-functionalized ionic liquid combined with PMDETA absorbent
The amino-functionalized ionic liquids([TETAH][3-Br-PhO])was synthesized using a one-step method from triethylenetetramine(TETA)and 3-bromophenol(3-Br-PhOH).A water-based CO2 absorption system,[TETAH][3-Br-PhO]-PMDETA-H2O,was created by mixing a PMDETA solution with deionized water as a co-solvent.Nuclear Magnetic Resonance Carbon Spectroscopy(13C NMR),Fourier Transform Infrared Spectroscopy(FTIR),and Thermogravimetric Analysis(TGA)were utilized to characterize the structure and thermal stability of the synthesized amino-functionalized ionic liquids.Furthermore,these techniques were used to investigate the reaction mechanism of CO2 absorption in the system.The effects of reaction temperature,system ratio,and water content on the absorption performance of CO2 were investigated.The results indicated that using a volume ratio of 4:6 for[TETAH][3-Br-PhO]to PMDETA,a deionized water content of 60vol％,and an absorption temperature of 25 ℃,the CO2 absorption capacity of the system reached a maximum of 3.72 mol·L-1.It was significantly higher than the CO2 absorption capacity of[TETAH][3-Br-PhO]and PMDETA alone.After undergoing heating desorption-regeneration at 120 ℃ for 90 min and completing 5 cycles of absorption-desorption,the regeneration efficiency remained at 87％.Additionally,the total CO2 absorption capacity reached 20.65 mol·L-1,indicating excellent performance in the regeneration cycle.The research shows that the amino-functionalized ionic liquids mixed solvent has significant potential for capturing CO2.
CO2 captureionic liquidsabsorption-desorptionregenerationreaction mechanism
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