(387e) Using Structure-Property Relationships to Design Reversible Ionic Liquids for CO2 Capture

Reversible ionic liquids (RevILs) have been developed as alternatives to traditionally cited CO₂ capture solvents such as monoethanolamine (MEA). RevILs capture CO₂ through chemical reaction of CO₂ with an amine functionality to form an ionic liquid. The resulting ionic liquid is then capable of absorbing additional CO₂ through physical absorption. The design of reversible ionic liquids has been an important focal point in our research group. Using structure-property relationships we have shown an ability to tune the relevant CO₂ capture properties by altering the structure of the starting RevIL. Properties targeted include CO₂ capture capacity, ionic liquid viscosity, temperature of CO₂ release, temperature of RevIL evaporation, and the enthalpy of CO₂ absorption. We have examined several additional modifications to the structure of our RevILs and investigated their effects on CO₂ capture properties. Our progress on developing these structure-property relationships to further the design of optimized solvents for CO₂ capture will be discussed.