A comparison of different amino acid solutions for CO2 capture using a membrane contactor
(2019) GEPROC 2019 — Location: Mons, Belgium (7.November.2019)
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- The growing concern about the global warming has triggered the public attention to the main greenhouse gas contributor namely carbon dioxide (CO2). The most extended post combustion CO2 capture technologies rely on absorption columns. Alkanolamines are typical solvents due to low cost and high absorption rates [1]. However, amine-based systems have high energy requirements for solvent regeneration and large solvent losses due to amine vaporization [2]. Lower energy consumption would be achievable using a different kind of technology: membrane contactors, which also allow an ease control of operating conditions, large contact area and scale-up flexibility [3]. In addition, the use of novel absorption solvents have been proposed in membrane contactors. For example, solvents with similar functionality as amines, such as amino acid salts (AAS). AAS are positively characterized by their high surface tension, non-volatility , etc., and their kinetics is defined by zwitterion reaction [4]. While an amino acid is initially inactive in the solution, it can be activated by addition of sodium hydroxide (NaOH), potassium hydroxide (KOH) and sodium carbonate (Na2CO3) [5]. In this work, five different amino acids have been studied for CO2 capture. The CO2 capture feasibility is studied in the membrane contactor using the amino acid salts solutions as the solvent, activated with NaOH. The process performance using the amino acids was compared to that using only NaOH in solution. Reference : [1] P. Luis, “Use of monoethanolamine (MEA) for CO2capture in a global scenario: Consequences and alternatives,” Desalination. 2016. [2] E. I. Koytsoumpa, C. Bergins, and E. Kakaras, “The CO2 economy: Review of CO2 capture and reuse technologies,” J. Supercrit. Fluids, vol. 132, pp. 3–16, Feb. 2018. [3] P. Luis and B. Van Der Bruggen, “The role of membranes in post-combustion CO2 capture,” Greenhouse Gases: Science and Technology. 2013. [4] S. Shen, X. Feng, R. Zhao, U. K. Ghosh, and A. Chen, “Kinetic study of carbon dioxide absorption with aqueous potassium carbonate promoted by arginine,” Chem. Eng. J., vol. 222, pp. 478–487, 2013. [5] J. van Holst, G. F. Versteeg, D. W. F. Brilman, and J. A. Hogendoorn, “Kinetic study of CO2 with various amino acid salts in aqueous solution,” Chem. Eng. Sci., vol. 64, no. 1, pp. 59–68, 2009.
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Sang Sefidi, V., & Luis Alconero, P. (2019). A comparison of different amino acid solutions for CO2 capture using a membrane contactor. GEPROC 2019, Mons, Belgium. https://hdl.handle.net/2078.5/64203