Carbon dioxide capture by non-aqueous blend in rotating packed bed reactor: Absorption and desorption investigation

Abstract

Carbon dioxide (CO2) capture and storage (CCS) is currently the most effective technology to reduce CO2 emissions, but it has crucial issues of high energy consumption and low mass transfer efficiency in capture process. In this work, 2-amino-2-methyl-1-propanol (AMP), 2-(2-aminoethylamino)ethanol (AEEA), N-methyl pyrrolidone (NMP) tri-solvent blend is used as a novel non-aqueous absorbent for CO2 capture process in rotating packed bed (RPB) reactor, which is employed to intensify the mass transfer in both absorption and desorption process. The experimental results show that this new method has good absorption performance. When the CO2 loading of the lean absorbent is 0.035 mol CO2/mol amine, the CO2 capture efficiency is still 89% and the overall volumetric mass transfer coefficient (KGa) is 2.67 kmol·m−3·h−1·kPa−1. For desorption process, this study adopted the direct steam stripping (DSS) technique to reduce energy consumption. The optimal regeneration energy consumption by DSS of this non-aqueous absorbent in RPB is about 2.46 GJ/ton CO2, which is 36.6% lower than that in conventional reboiler regeneration process with 30% MEA solution. The results indicate that this new method has the advantages of high efficiency and low energy consumption, exhibiting good industrial application prospect.