Membrane Stripping Technology for CO2 Desorption from CO2-rich Absorbents with Low Energy Consumption

CO2 membrane stripping is a novel method for CO2 desorption at low temperature (around 348K) for amine-based CO2 capture, which has the potential to reduce regeneration energy requirement. In this work, we investigated CO2 membrane stripping with two different commercial hollow fiber membranes, polypropylene (PP) and Polyvinylidene fluoride (PVDF). CO2 membrane stripping in PVDF membrane showed a faster CO2 desorption rate than in PP membrane, but PP membrane presented a better stability on long-term running. Energy consumption for CO2 membrane stripping with 20 wt% MEA solvent was evaluated. Compared with conventional thermal regeneration, 28% energy can be saved if regeneration pressure of CO2 membrane stripping operated at 20 kPa.