Simulation and Experiment of CO2 Capture by a Mixture of Alkanolamine and Deep Eutectic Solvent in a Rotating Packed Bed

• Main Authors: Gang-Yao Zhang, 張剛耀
• Other Authors: Yu-Shao Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/76528016329706661064

碩士 === 中原大學 === 化學工程研究所 === 105 === In this study, a mixture of 2-methylethanolamine (MMEA) solution with deep eutectic solvent (DES) of choline chloride (ChCl) and ethylene glycol (EG) was used as an absorbent to capture carbon dioxide from gas stream in a rotating paced bed. The effect of rotating speed, gas flow rate, concentration of alkanolamine and the ratio of DES and water in the absorbent on carbon dioxide removal efficiency (E%), mass transfer coefficient (KGa) was investigated. Additionally, the regeneration energy of absorbent was estimated by Aspen Plus and theoretical method. Experimental results showed that CO2 removal efficiency increased with increasing concentration of alkanolamine and rotating speed ranging between 600 and 1800 rpm, but decreased with increasing gas flow rate. Moreover, adding 30wt% DES in 60wt% MMEA solution could effectively enhance CO2 removal efficiency. Calculated results showed that specific regeneration energy of Aspen Plus and theoretical method is approximate. Specific regeneration energy decreased with increasing concentration of alkanolamine and DES. In this study, an optimum composition of absorbent of 60wt% MMEA/30wt% DES/10wt% H2O was obtained. The removal efficiency and KGa of the proposed absorbent were 93.36 % and 10.5 1/s at gas flow rate of 50 L/min, liquid flow rate of 0.1 L/min, temperature of 50°C and rotating speed of 2400 rpm. Compared with 30wt% MEA solution, the removal efficiency and KGa of the proposed absorbent were increased from 68% to 93.36% and 3.51 to 10.5 1/s while the regeneration energy can be reduced from 3.57 GJ/ton CO2 to 2.09 GJ/ton CO2. This result shows that MMEA solution mixed with DES has a great potential for CO2 capture process in a RPB.