456402 Facilitated Transport Membranes for CO2 Separation and Capture

Sunday, November 13, 2016: 4:15 PM
Continental 6 (Hilton San Francisco Union Square)
Witopo Salim, Zi Tong, Varun Vakharia, Dongzhu Wu and W.S. Winston Ho, William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH

This presentation is in honor of Dr. John Quinn for his pioneering work on facilitated transport membranes including those for CO2 separation, and it covers CO2 facilitated transport membranes for: (1) hydrogen purification for fuel cells and (2) CO2 capture from flue gas in power plants and from <1% CO2 concentration sources. We have synthesized CO2-selective membranes by incorporating amino groups into polymer networks. The membranes have shown high CO2 permeability and selectivity vs. hydrogen, carbon monoxide and nitrogen. We have elucidated the effect of amine steric hindrance in the solid membrane, showing significant enhancement for CO2 transport. The membranes were scaled up to 14 inches in width by using a continuous roll-to-roll machine equipped with a thin-film-coating assembly. For the CO2 separation from a synthesis gas stream containing CO2 and H2S, i.e., hydrogen purification for fuel cells or pre-combustion CO2 capture in IGCC (integrated gasification combined cycle) technology, thicker amine-containing membranes with around 15 ± 1 microns of selective layer thicknesses were fabricated. For the post-combustion CO2 capture from flue gas, thinner amine-containing membranes with < 200 ± 20 nm of selective layer thicknesses were scaled up. From gas transport measurements, the flat-sheet samples of the scale-up membranes for both applications exhibited similar performances compared to the membranes synthesized in lab scale. CO2 permeance of approximately 200 GPU and CO2/H2 selectivity > 200 were for the thicker membranes for the purification of hydrogen and synthesis gas along with CO2 capture (e.g., pre-combustion capture), and CO2 permeance of about 800 GPU and CO2/N2 selectivity > 140 were for the thinner membranes for CO2 capture from flue gas. The scale-up membrane has been fabricated into spiral-wound membrane modules. Techno-economic analysis has shown that the post-combustion capture process using the thin membrane has approached DOE’s capture cost target for 2025.

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