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

Abstract

CO 2 membrane stripping is a novel method for CO 2 desorption at low temperature (around 348K) for amine-based CO 2 capture, which has the potential to reduce regeneration energy requirement. In this work, we investigated CO 2 membrane stripping with two different commercial hollow fiber membranes, polypropylene (PP) and Polyvinylidene fluoride (PVDF). CO 2 membrane stripping in PVDF membrane showed a faster CO 2 desorption rate than in PP membrane, but PP membrane presented a better stability on long-term running. Energy consumption for CO 2 membrane stripping with 20 wt% MEA solvent was evaluated. Compared with conventional thermal regeneration, 28% energy can be saved if regeneration pressure of CO 2 membrane stripping operated at 20 kPa.