Abstract：Membrane desorption and regeneration experiments were carried out in which hollow fiber membrane contactor (FMC) was used as desorption device, and N-methyldiethanolamine (MDEA)–diethanolamine (DEA) mixed absorbent was used as CO2-rich solution. The effects of desorption temperature, pressure and liquid flow velocity on desorption were investigated. The CO2 secondary absorption and desorption properties of the regenerated solution was further explored. The results showed that the optimum solute malor ratio of mixed absorbent was MDEA:DEA=1:0.6 at the sampling time of 20 and 40 min. CO2 releasing flux and desorption rate increased with the increasing of temperature, pressure and flow velocity. The peak CO2 releasing flux at 60℃ was 101.29 mL/min (the peak moved forward), the CO2 final desorption rate was 61.51%, comparing with the 30℃ group increased by 56.14% and 50.5%, respectively. The peak CO2 releasing flux at 20 kPa was 96.17 mL/min (the peak moved forward), the CO2 final desorption rate was 58.66%, comparing with the 65 kPa group increased by 62.21% and 16.85%, respectively. At a liquid flow velocity of 0.08 m/s, the peak CO2 releasing flux was 88.65 mL/min (the peak time did not move forward), and the CO2 final desorption rate was 55.63%, that was 43.45% and 30.13% higher than the 0.02 m/s group, respectively. Regeneration solution recycling test found that, MDEA?DEA regeneration solution retains 70% CO2 absorption capacity of the original solution after 5 cycles, the secondary desorption rate remained at around 60% without a significant decrease as well. Desorption of mixed CO2-rich solution by membrane method had a good effect, and the regeneration solution possessed excellent secondary absorption and desorption properties.
张卫风 马伟春 黄珍 李靳 焦月潭 钟林新. 基于中空纤维膜的混合富CO2吸收液解吸及再生[J]. 过程工程学报, 2018, 18(2): 318-323.
Weifeng ZHANG Weichun MA Zhen HUANG Jin LI Yuetan JIAO Linxin ZHONG. Desorption and Regeneration of Mixed CO2-rich Solution Based on Hollow Fiber Membrane. Chin. J. Process Eng., 2018, 18(2): 318-323.