Effect of Blending Ratio and Temperature on CO2 Solubility in Blended Aqueous Solution of Monoethanolamine and 2-Amino-2-methyl-propanol: Experimental and Modeling Study Using the Electrolyte Nonrandom Two-Liquid Model

Bong-Keun Choi; Seung-Mo Kim; Jong-Seop Lee; Young Cheol Park; Dong-Hyuk Chun; Hun-Yong Shin; Hyun-Je Sung; Byoung-Moo Min; Jong-Ho Moon

doi:10.1021/acsomega.0c04046

Effect of Blending Ratio and Temperature on CO₂ Solubility in Blended Aqueous Solution of Monoethanolamine and 2-Amino-2-methyl-propanol: Experimental and Modeling Study Using the Electrolyte Nonrandom Two-Liquid Model

ACS Omega. 2020 Oct 27;5(44):28738-28748. doi: 10.1021/acsomega.0c04046. eCollection 2020 Nov 10.

Authors

Bong-Keun Choi¹, Seung-Mo Kim¹, Jong-Seop Lee², Young Cheol Park², Dong-Hyuk Chun², Hun-Yong Shin³, Hyun-Je Sung⁴, Byoung-Moo Min², Jong-Ho Moon¹

Affiliations

¹ Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Korea.
² Korea Institute of Energy Research, 102 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea.
³ Seoul National University of Science & Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea.
⁴ Research Laboratory, Hansol EME, Seongnam 13591, Korea.

Abstract

This paper reports the newly measured experimental data for CO₂ solubility in a blended aqueous solution of monoethanolamine (MEA) and 2-amino-2-methyl-propanol (AMP) at different amine mixing ratios (MEA/AMP/H₂O = 9:21:70, 15:15:70, and 21:9:70 wt %) and working temperatures (323.15, 373.15, and 383.15 K). The successive substitution method was used for calculating the mole fractions of all molecules (four molecules) and electrolytes (three cations and four anions) from the equilibrium along with the material and charge balance equations (11 equations). The electrolyte nonrandom two-liquid (e-NRTL) model was used to investigate nonideality in the liquid phase. Using the abovementioned thermodynamic models, the partial pressures of CO₂ in the gas phase, mole fractions of all components in the liquid phase, pH variations, heats of absorption, and cyclic capacities of CO₂ according to the absorption/desorption temperature and the blending ratio of MEA/AMP were estimated.