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Received March 25, 2016
Accepted June 28, 2016
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CO2 capture using aqueous solutions of K2CO3+2-methylpiperazine and monoethanolamine: Specific heat capacity and heat of absorption
Green Energy Process Laboratory, Climate Change Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
Korean Journal of Chemical Engineering, December 2016, 33(12), 3465-3472(8), 10.1007/s11814-016-0186-3
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Abstract
The specific heat capacity, heat of CO2 absorption, and CO2 absorption capacity of aqueous solutions of potassium carbonate (K2CO3)+2-methylpiperazine (2-MPZ) and monoethanolamine (MEA) were measured over various temperatures. An aqueous solution of K2CO3+2-MPZ is a promising absorbent for CO2 capture because it has high CO2 absorption capacity with improved absorption rate and degradation stability. Aqueous solution of MEA was used as a reference absorbent for comprison of the thermodynamic characteristics. Specific heat capacity was measured using a differential scanning calorimeter (DSC), and heat of CO2 absorption and CO2 absorption capacity were measured using a differential reaction calorimeter (DRC). The CO2-loaded solutions had lower specific heat capacities than those of fresh solutions. Aqueous solutions of K2CO3+2-MPZ had lower specific heat capacity than those of MEA over the temperature ranges of 303-353 K. Under the typical operating conditions for the process (CO2 loading=0.23mol- CO2·mol-1-solute in fresh solution, T=313 K), the heat of absorption (-ΔHabs) of aqueous solutions of K2CO3+2-MPZ and MEA were approximately 49 and 75 kJ·mol-CO2, respectively. The thermodynamic data from this study can be used to design a process for CO2 capture.
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Laddha SS, Danckwerts PV, Chem. Eng. Sci., 37, 665 (1982)
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Astarita G, Savage DW, Longo JM, Chem. Eng. Sci., 36, 581 (1981)
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Wang M, Lawal A, Stephenson P, Sidders J, Ramshaw C, Chem. Eng. Res. Des., 89(9A), 1609 (2011)
Kim YE, Lim JA, Jeong SK, Yoon YI, Bae ST, Nam SC, Bull. Korean Chem. Soc., 34, 783 (2013)
Lim JA, Kim DH, Yoon Y, Jeong SK, Park KT, Nam SC, Energy Fuels, 26(6), 3910 (2012)
Rao AB, Rubin ES, Environ. Sci. Technol., 36, 4467 (2002)
Sakwattanapong R, Aroonwilas A, Veawab A, Ind. Eng. Chem. Res., 44(12), 4465 (2005)
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Versteeg GF, van Swaaij WPM, Chem. Eng. Sci., 43, 573 (1988)
Littel RJ, Versteeg GF, van Swaaij WPM, Chem. Eng. Sci., 47, 2027 (1992)
