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(754b) CO2-Selective Membranes Containing Amino or Ethylene Oxide Groups for Carbon Capture from Flue Gas

Chen, Y., The Ohio State University
Ho, W. S. W., The Ohio State University

This presentation covers two types of CO2-selective membranes for carbon capture from flue gas: (1) amine-based membranes and (2) ethylene oxide (EO)-based membranes.  The former is based on the facilitated transport mechanism, while the latter is based on the solution-diffusion transport mechanism.  For the membranes containing amino groups, a high-molecular-weight of polyamine was successfully synthesized.  Different selected aminoacid salts were incorporated into the polyamine solution for membrane preparation.  The polyamine served as a fixed carrier, and the amino acid salts acted as mobile carriers.  The amine-containing membranes showed a CO2 permeance of more than 1100 GPU and a CO2/N2 selectivity of at least 200 at 57ºC.  For the membranes containing EO groups, we have synthesized membranes with polyamide-polyethylene oxide (PA-PEO) copolymer blended with polyethylene glycol dimethyl ether (PEG-DME) or polyethylene glycol (PEG).  We have also synthesized a polydimethylsiloxane (PDMS) membrane reproducibly with a very high CO2 permeance, which can be used as a caulking layer for our thin membranes.  The membrane containing EO groups we synthesized was SO2-insensitive but had a low CO2/N2 selectivity.  The resulting membranes showed a CO2 permeance of 940 GPU and a CO2/N2 selectivity of 25 at 57ºC.  The syntheses and transport properties of the membranes will be presented.  The effects of different aminoacid salt mobile carriers, EO-containing small molecules and membrane thicknesses on the membrane transport performance will be discussed.  We are continuing to improve the transport performance of both types of CO2-selective membranes.