Institute of Research and Development, Duy Tan University, Da Nang, Vietnam.
The Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, Vietnam.
PLoS One. 2020 Jul 23;15(7):e0236367. doi: 10.1371/journal.pone.0236367. eCollection 2020.
Chemical absorption of carbon dioxide from flue or natural gas in hollow-fiber membrane contactors (HFMCs) has been one of the most beneficial techniques to alleviate its emission into the environment. A theoretical research study was done to investigate the change in membrane specifications and operating conditions on CO2 absorption using different alkanolamine solvents. The mathematical model was developed for a parallel counter-current fluid flow through a HFMC. The developed model's equations were solved based on finite element method. The simulations revealed that the increase in membrane porosity, length and the number of fibers has a positive impact on CO2 removal, while the gas flow rate and tortuosity enhancement resulted in the reduction of CO2 absorption. Furthermore, it was found that 4-diethylamino-2-butanol (DEAB) with approximately 100% CO2 absorption is suggested as the best solvent in this system, but ethyl-ethanolamine (EEA) with only 46% CO2 absorption had the lowest capacity for CO2 absorption (DEAB>MEA>EDA>MDEA>TEA>EEA). It is worth pointing out that the CO2 absorption can be improved using EEA solvent via change in membrane specifications such as increase in membrane porosity, length and the number of fibres.
二氧化碳在中空纤维膜接触器（HFMCs）中从烟道气或天然气中的化学吸收是缓解其排放到环境中的最有益技术之一。进行了一项理论研究，以研究使用不同醇胺溶剂时膜规格和操作条件的变化对 CO2 吸收的影响。为 HFMC 中的平行逆流流体流动开发了数学模型。根据有限元法求解了所开发模型的方程。模拟表明，膜孔隙率、长度和纤维数量的增加对 CO2 去除有积极影响，而气体流速和曲折度的增加则导致 CO2 吸收减少。此外，发现 4-二乙氨基-2-丁醇（DEAB）在该体系中具有约 100%的 CO2 吸收，是最佳溶剂，而仅具有 46% CO2 吸收的乙氧基乙胺（EEA）具有最低的 CO2 吸收能力（DEAB>MEA>EDA>MDEA>TEA>EEA）。值得注意的是，通过改变膜的规格，如增加膜的孔隙率、长度和纤维数量，可以提高 EEA 溶剂的 CO2 吸收能力。
