Abstract
A CO2 capture system without supercritical CO2 was optimized for mixtures of hydrophobic room temperature ionic liquids (RTILs) and propanol. We tested RTILs using bis(trifluoromethanesulfonyl)imide, TFSI-, anion and four quaternary ammonium cations, two quaternary phosphonium cations, and one imidazolium cation. The addition of 2-propanol into the RTILs clearly promoted the capture of normal CO2(nCO2) at ambient temperature and pressure. When combined with 2-propanol, the most efficient RTILs for nCO2 capture were N-butyl-N,N,N-trimethylammonium TFSI-. This enhancement of nCO2 capture was not observed in RTIL mixtures with 1-propanol or in propanol mixtures containing other phosphonium- and imidazolium-based RTILs. The torsion angle of TFSI-, which was calculated using density functional theory, is thought to be related to high nCO2 capture efficiently.
Highlights
The emission of greenhouse gases, which warms the Earth’s surface and atmosphere, is an urgent global problem
We did not consider the amount of propanol in this study, as propanol is relatively inexpensive compared with the Room temperature ionic liquids (RTILs)
The results show that the addition of 2-propanol can promote normal CO2 (nCO2) capture in the propanol-rich region
Summary
The emission of greenhouse gases, which warms the Earth’s surface and atmosphere, is an urgent global problem. Room temperature ionic liquids (RTILs) have attracted considerable attention for the capture of carbon. (2016) CO2 Capture at Room Temperature and Ambient Pressure: Isomer Effect in Room Temperature Ionic Liquid/Propanol Solutions. Various theoretical [2]-[6] and experimental [7]-[13] investigations have been conducted to further develop techniques for CO2 capture and storage in green chemistry. To apply RTILs in actual industrial applications, developing a cost-effective system that does not require high temperature or pressure for nCO2 capture remains necessary
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