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http://dx.doi.org/10.7464/ksct.2021.27.3.255

Effect of Isopropanol on CO2 Absorption by Diethylenetriamine Aqueous Solutions  

Lee, Hwa Young (School of Chemical and Materials Engineering, Korea National University of Transportation)
Seok, Chang Hwan (School of Chemical and Materials Engineering, Korea National University of Transportation)
Hong, Yeon Ki (School of Chemical and Materials Engineering, Korea National University of Transportation)
Publication Information
Clean Technology / v.27, no.3, 2021 , pp. 255-260 More about this Journal
Abstract
A drawback in the CO2 capture process using an aqueous amine solution is the high energy requirement for the regeneration process. In order to overcome this disadvantage, this study investigated CO2 capture characteristics using a biphasic absorbent in which isopropanol (IPA) was introduced into an aqueous solution of diethylenetriamine (DETA). When the IPA composition exceeded 20 wt% in 20 wt% DETA aqueous solution, the absorbent phase was liquid-liquid separated into a CO2-rich phase and a CO2-lean phase because of the low solubility of the salt formed by the reaction of CO2 with DETA in isopropanol. When the isopropanol composition in the DETA aqueous solution increased, the phase volume ratio of the CO2-rich phase to the volume of the CO2-lean phase increased; and, accordingly, the CO2 in the CO2-rich phase was more concentrated. The results of absorbing CO2 in a packed tower using 20 wt% DETA + IPA + water absorbent confirmed that both the CO2 absorption capacity and the absorption rate were higher than that of the 20 wt% DETA aqueous solution. When a biphasic absorbent composed of DETA + IPA + water is applied to CO2 capture, it can be expected to concentrate CO2 because of phase separation and thereby reduce regeneration energy owing to volume reduction of the CO2-rich phase.
Keywords
$CO_2$ capture; Biphasic absorbent; Isopropanol; Regeneration energy;
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1 Zhang, S., Shen, Y., Wang, L., Chen, J., and Lu, Y., "Phase Change Solvents for Post-Combustion CO2 Capture: Principle, Advances, and Challenges," Appl. Energy, 239, 876-897 (2019).   DOI
2 Xu, Z., Wang, S., and Chen, C., "CO2 Absorption by Biphasic Solvents: Mixtures of 1,4-Butanediamine and 2-(Diethylamino)-Ethanol," Int. J. Greenh. Gas Control, 16, 107-115 (2013).   DOI
3 Lu, Y., and O'Brien, K., "Challenges & Opportunity for Post-Combustion Carbon Capture," EM Magazine, 6-12 (2015).
4 D'Alessandro, D. M., Smit, B., and Long, J. R., "Carbon Dioxide Capture: Prospects for New Materials," Angew. Chem., Int. Ed. 49(35), 6058-6082 (2010).   DOI
5 Zhao, B., Su, Y., Tao, W., Li, L., and Peng, Y., "Post-Combustion CO2 Capture by Aqueous Ammonia: A State-of-the-Art Review," Int. J. Greenh. Gas Control, 9, 355-371 (2012).   DOI
6 Wang, L., Zhang, Y., Wang, R., Li, Q., Zhang, S., Li, M., Liu, J., and Chen, B., "Advanced Monoethanolamine Absorption Using Sulfolane as a Phase Splitter for CO2 Capture," Environ. Sci. Technol., 52(24), 14556-14563 (2018).   DOI
7 Lee, J., Hong, Y. K., and You, J. K., "Phase Separation Characteristics in Biphasic Solvents Based on Mutually Miscible Amines for Energy Efficient CO2 Capture," Korean J. Chem. Eng., 34(6), 1840-1845 (2017).   DOI
8 Pinto, D. D. D., Zaidy, S. A. H., Hartono, A., and Svendsen, H. F., "Evaluation of a Phase Change Solvent for CO2 Capture: Absorption and Desorption Tests," Int. J. Greenh. Gas Control, 28, 318-327 (2014).   DOI
9 Liu, F., Fang, M., Dong, W., Wang, T., Xia, Z., Wang, Q., and Luo, Z., "Carbon Dioxide Absorption in Aqueous Alkanolamine Blends for Biphasic Solvents Screening and Evaluation," Appl. Energy, 233-234, 468-477 (2019).   DOI
10 Li, K., Leigh, W., Feron, P., Yu, H., and Tade, M., "Systematic Study of Aqueous Monoethanolamine (MEA)-based CO2 Capture Process: Techno-Economic Assessment of the MEA Process and its Improvements," Appl. Energy, 165, 648-659 (2016).   DOI
11 Lee, H. Y., Seok, C. H., You, J. K., and Hong, Y. K., "Absorption Characteristics of Carbon Dioxide by Water-Lean Diethyltriamine Absorbents Mixed with Physical Solvents," Clean Technol., 24(1), 50-54 (2018).   DOI
12 Zhuang, Q., and Clements, B., "CO2 Capture by Biphasic Absorbent-Absorption Performance and VLE Characteristics," Energy, 147, 169-176 (2018).   DOI
13 Barzagli, F., Mani, F., and Peruzzini, M., "Novel Water-Free Biphasic Absorbents for Efficient CO2 Capture," Int. J. Greenh. Gas Control, 60, 100-109 (2017).   DOI
14 Liu, F., Fang, M., Yi, N., and Wang, T., "Research on Alkanolamine-Based Physical-Chemical Solutions as Biphasic Solvents for CO2 Capture," Energy Fuels, 33(11), 11389-11398 (2019).   DOI
15 Fu, K., Chen, G., Sema, T., Zhang, X., Liang, Z., Idem, R., and Tontiwachwuthikul, P., "Experimental Study on Mass Transfer and Prediction Using Aritificial neural Network for CO2 Absorption into Aqueous DETA," Chem. Eng. Sci., 100, 195-202 (2013).   DOI