(10e) Highly Polar Polymers with Superior Membrane CO2/N2 Separation Properties for Carbon Capture | AIChE

(10e) Highly Polar Polymers with Superior Membrane CO2/N2 Separation Properties for Carbon Capture

Authors 

Lin, H. - Presenter, University of Buffalo, State University of New Yor
Liu, J., Air Liquide
Membrane technology has emerged as a potentially economically viable alternative for CO2 captures from fossil fuel-fired powers, enabled by advanced membrane materials with high CO2 permeability and high CO2/N2 selectivity. Current leading membrane materials usually contain poly(ethylene oxide) (PEO) because the ether oxygen in PEO interacts favorably with CO2, resulting in high CO2/N2 selectivity. Herein we prepare a series of highly branched amorphous polymers containing poly(1,3-dioxolane), which has an O:C ratio of 0.67, higher than 0.5 in PEO. The length of the poly(1,3-dioxolane)-based branches are tuned to yield amorphous nature, and mobile ethoxyl chain end groups are introduced to provide high free volume and gas diffusivity. These ether oxygen-rich polymers exhibit more superior CO2/N2 separation properties than the PEO-based materials at practical conditions for flue gas processing, and above the Robeson’s upper bound. This work demonstrates that harnessing the interactions between polymers and CO2 may provide unprecedented opportunities in designing gas separation membranes with robust performance under practical conditions.