Enhancement of CO2 removal by promoted MDEA solution in a hollow fiber membrane contactor: A numerical and experimental study

Carbon Capture Science & Technology

Renzo Di Felice¹  Ahmad Taghizade²  Saber Kiani²  Rouzbeh Ramezani³  Gomotsegang Fred Molelekwa³  Saeed Mazinani⁴ 

[1] Corresponding author: Dr. Rouzbeh Ramezani, University of Genoa Faculty of Engineering: Universita degli Studi di Genova Scu, Italy;Arman Farayand Sanat Iranian, Jadiri Shomali Street, Tabriz, Iran;Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Opera Pia, 16145 Genova, Italy;Department of Environmental Health, Tshwane University of Technology, Staatsartillerie Road, Pretoria West, 0183, South Africa;

关键词: MDEA;    Potassium lysinate;    Amino acid salt;    MDEA+KLys;    Nano-absorbent;    ZIF-8;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this work, carbon dioxide (CO2) loading capacity of methyldiethanolamine (MDEA) solution promoted by potassium lysinate (KLys) was experimentally measured by using a gas absorption setup at different concentrations and temperatures. The CO2 removal efficiency of the MDEA + KLys solution was investigated for a CO2/N2 gas mixture by using computational fluid dynamic (CFD) simulations in a hollow fiber membrane contactor (HFMC). The effects of operating conditions including solvent concentration, solvent flow rate, gas flow rate, inlet CO2 concentration and module length on the CO2 removal efficiency were also studied. The experimental results revealed that CO2 loading capacity increases with increasing KLys concentration in the solution, while decreases as temperature increases. The simulation results indicated that MDEA + KLys solution has higher CO2 removal efficiency compared to pristine MDEA and MEA solutions. The CO2 removal efficiency increases with increasing solvent concentration, solvent flow rate and module length, whereas decreases as gas flow rate increases. The zeolitic imidazolate framework-8 (ZIF-8), as sorbent, was then incorporated into the MDEA + KLys solution and its effect on the CO2 removal efficiency was also examined. The MDEA + KLys + ZIF-8 nano-absorbent showed higher CO2 removal efficiency than that of MDEA + KLys absorbent, where introducing 0.4 wt.% ZIF-8 enhanced CO2 removal from ⁓96% to ⁓99%. The results of this work suggest that both MDEA + KLys absorbent and MDEA + KLys + ZIF-8 nano-absorbent are promising candidates for CO2 absorption processes. However, for practical use as well as a complete investigation, their behavior should be assessed by using other parameters of solvent such as reactivity with CO2, corrosion rate, and regeneration performance.

【 授权许可】

Unknown