(324d) Ionic Liquids Functionalized, Polymerized, and Encapsulated for CO2 Capture from Cabin Air and the Atmopshere
AIChE Annual Meeting
Tuesday, November 15, 2022 - 2:00pm to 2:30pm
Superior binding capacity and CO2 selectivity in the first two approaches by a reactive IL with multiple functional moieties demonstrate the suitability of these sorbents for direct air capture (DAC). However, that the eutectics are often not as thermally stable as ILs and present low vapor pressures; both issues can be addressed by non-thermal regeneration approaches that we are currently working on. Similarly, the capsules fabricated to date are tens of microns in size and present non-ideal breakthrough curves as a result of pressure drop in the absorber column. Further studies optimizing the capsule dimensions are needed. Finally, the membranes that we fabricated from graphene oxide nano framework that is impregnated with functional poly(IL)-IL gel demonstrate CO2 permeance that crosses over the Robeson upper bound demonstrating facilitated transport of CO2. The CO2/N2 and CO2/air separation ratios are measured as 1200 and 300, respectively, at 22 °C and 40% relative humidity. These results represent one of the very few studies in facilitated transport membranes for DAC.