Carbon Dioxide Absorption from Biogas by Amino Acid Salt Promoted Potassium Carbonate Solutions in a Hollow Fiber Membrane Contactor: A Numerical Study
2018
Li, Yifu | Wang, Li’ao | Zhang, Zhien | Hu, Xinyue | Cheng, Yin | Zhong, Cheng
Aqueous K₂CO₃ solution is a promising absorbent in removing CO₂ from gas mixtures using a hollow fiber membrane contactor (HFMC). The use of amino acid salts (AASs) as a promoter in K₂CO₃ solutions may further improve absorption performance. In this study, a two-dimensional mathematical model was developed to simulate the CO₂ absorption process in an HFMC, where potassium salts of glycinate (PG), lysine (PL), and arginine (PA) were considered as promoters in K₂CO₃ solution. The absorption performances of K₂CO₃ solutions with and without promoters were analyzed theoretically. The effects of operating parameters, such as AAS concentration, temperature, pressure, flow rate, and initial CO₂ content, on the absorption process were also investigated. The results showed that the use of AASs as promoters in K₂CO₃ solution significantly enhances the CO₂ absorption performance. PG-promoted K₂CO₃ solution outperformed the other two, as it showed the highest absorption flux and CO₂ removal efficiency under any operating conditions.
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