Study on absorption and regeneration performance of EHA-DMSO non-aqueous absorbent for CO2 capture from flue gas

Abstract

In previous work by Fu et al. (2021, 2022), the performance of 2-ethylhexylan-1-amine (EHA) and diglyme absorbents for carbon dioxide (CO2) capture from flue gas was demonstrated. In this study, dimethyl sulfoxide (DMSO) was selected as a replacement for diglyme due to its high boiling point, low viscosity, and environmentally friendly properties. The optimization of the mass fraction resulted in a composition of 60 wt% EHA and 40 wt% DMSO, considering factors such as absorption capacity, absorption rate, and viscosity. At a desorption temperature of 373 K, the CO2-loaded EHA-DMSO exhibited a desorption efficiency of approximately 98 %. The estimation of desorption energy (Et) consumption, using the method of electric energy consumption, revealed that EHA-DMSO achieved approximately a 50 % reduction in Et compared to the MEA (30 wt%) absorbent. Even with a water content of 10 %, Et was reduced by around 40 %. Additionally, the absorbent demonstrated notable advantages in terms of water resistance and cycle performance. The advantages of environmental friendliness and easy availability of raw materials suggest that the EHA-DMSO absorbent holds a promising potential for broader application in the field of CO2 capture from flue gas.