Precombustion CO2 Capture in Polymeric Hollow Fiber Membrane Contactors Using Ionic Liquids: Porous Membrane versus Nonporous Composite Membrane
Year: 2016
Journal: Ind. Eng. Chem. Res.
Authors: Dai, ZD; Ansaloni, L; Deng, LY
In the present work, membrane contactors using both porous and nonporous polymeric hollow fiber membranes with ionic liquids as absorbent were developed for precombustion CO2 capture at elevated temperature and pressures. 1-Butyl-3-methylimidazolium tricyanomethanide [Bmim] [TCM] was selected as the ILs absorbent. The compatibility and stability of six different polymeric membranes were evaluated, while the porous PTFE membrane and nonporous Teflon-PP composite membrane were considered to be the most suitable membranes for this application. Both membrane configurations were tested and showed comparable separation performances: CO2 flux values of 4.86 x 10(-4) and 4.75 x 10(-4) mol m(-2) s(-1) were obtained for the porous PTFE and nonporous Teflon-PP membrane contactor at 20 bar with a gas flow rate of 200 mL min(-1), respectively. The Teflon-PP composite membrane exhibited better stability as compared to the porous PTFE membrane in a 14 day test.
