(731b) Integrated Systems for Continuous CO2 Separations from Industrial Flue Gas Sources.

Managing the constant accretion of greenhouse gases such as CO₂ in the earth’s troposphere is the challenge of this century. Out of the available technologies for CO₂ capture, water-driven CO₂ capture is attractive since it incurs a low energy penalty. The Migration Assisted Moisture Gradient (MAMG) technology is a water-based CO2 capture system that involves CO₂ capture and release based on the bicarbonate-carbonate equilibria. The CO₂ capture occurs in an organic phase, and the captured CO₂ migrates to the aqueous phase, which is separated by the membrane under an external bias. Herein, we present the results of improving the energy efficiency of the MAMG process by integrating the hollow fiber membrane for gas contacting. Moreover, we also demonstrate the results from the large-scale operation of the MAMG process in a Bipolar Membrane Electro Dialysis unit (BPMED) unit for CO₂ capture from flue gas containing impurities. Parameters such as the residence time of the gas in the hollow fiber membrane, surface area of the membrane, effects of CO₂ concentration, impurities such as SO_x, and relative humidity of the flue gas on the rate of CO₂ capture will also be presented.