Rate of CO2 absorption of a phase‐separation absorbent

Abstract

AbstractIn this study, we evaluated the CO2 absorption characteristics of a phase‐separation amine absorbent. The phase‐separation absorbent consists of a 30:60:10 (by weight percent) mixture of 2‐(ethylamino)ethanol, diethylene glycol diethyl ether, and water. The CO2 absorption rate of the phase‐separation absorbent was measured in a lab‐scale counter flow absorber. In addition, the CO2 transport phenomena in the absorber were analyzed by performing model fitting. The experimental results revealed that the CO2 absorption rates are different before and after phase separation. In fact, the overall CO2 absorption capacity coefficient after phase separation is 4.5 times higher than that obtained before phase separation. By changing the gas‐liquid ratio, we obtained a CO2 recovery ratio of over 80% using the model. Thus, the absorption temperature, CO2 loading, and gas‐liquid ratio can be tuned to obtain the desired CO2 recovery ratio.