Hollow fiber membrane process for SO₂ removal from flue gas

Abstract

BACKGROUND In this study, a polymeric membrane process was investigated to avoid the poisoning of CO2 sorbents with SO2 during the carbon capture and separation (CCS) process. Two types of hollow fiber composite membranes were prepared using poly(ether‐b‐amide) (PEBAX) and cellulose acetate (CA) as composite materials. RESULTS Both of the composite membranes exhibit a trade‐off between the pure gas permeance and the ideal selectivity. The PEBAX1657/PEI exhibited higher permeance than CA/PES due to the morphology of the substrate and the effects of the coating material. A mixed‐gas separation experiment investigated the SO2 removal efficiency and the CO2 loss ratio. The SO2 removal efficiency and CO2 loss ratio were found to be positively correlated with the permeance of the gas components. A multi‐stage membrane process was designed to reduce the CO2 loss ratio with a 90% removal efficiency of SO2. Compared with a single‐stage process, the CO2 loss ratio was decreased by up to 16.1%, and the membrane area was estimated at 18.1 m2 for the multi‐stage process. CONCLUSION A multi‐stage membrane process was designed using different types of membrane modules to decrease CO2 loss ratio without sacrificing SO2 removal efficiency. © 2014 Society of Chemical Industry

Treatment of flue-gas impurities for liquid absorbent-based post-combustion CO2 capture processes

“…s0110 22.4.5 Noteworthy technologies p0590 SO 2 removal from humid air has been demonstrated using a pulsed steamer corona (Mizuno et al, 1986). Desulfurization using membrane technologies is promising, with polymeric membranes attracting much attention (Kim et al, 2015). The theory and science behind the membrane technology is simple; however, the practical application is complex.…”