Modeling of CO2 equilibrium solubility in a novel 1‐Diethylamino‐2‐Propanol Solvent |
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| Authors: | Helei Liu Min Xiao Xiao Luo Hongxia Gao Raphael Idem Paitoon Tontiwachwuthikul Zhiwu Liang |
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| Affiliation: | 1. Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost‐effective Utilization of Fossil Fuel Aimed at Reducing Carbon‐dioxide Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P.R. China;2. Faculty of Engineering and Applied Science, Clean Energy Technologies Research Institute (CETRI), University of Regina, Regina, Saskatchewan, Canada |
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| Abstract: | In this work, the equilibrium solubility of CO2 in a 1‐diethylamino‐2‐propanol (1DEA2P) solution was determined as a function of 1DEA2P concentration (over the range of 1–2 M), temperature (in the range of 298–333 K), and CO2 partial pressure (in the range of 8–101 kPa). These experimental results were used to fit the present correlation for K2 (Kent‐Eisenberg model, Austgen model, and Li‐Shen model). It was found that all of the models could represent the CO2 equilibrium solubility in 1DEA2P solution with ADDs for Kent‐Eisenberg model, Austgen model, and Li‐Shen model of 6.3, 7.3, and 12.2%, respectively. A new K2 correlation model, the Liu‐Helei model, was also developed to predict the CO2 equilibrium solubility in 1DEA2P solution with an excellent ADD of 3.4%. In addition, the heat of absorption of CO2 in 1DEA2P solution estimated by using the Gibbs‐Helmholtz equation was found to be ?45.7 ± 3.7 kJ/mol. Information and guidelines about effectively using data for screened solvents is also provided based on the three absorption parameters: CO2 equilibrium solubility, second order reaction constant (k2), and CO2 absorption heat. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4465–4475, 2017 |
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| Keywords: | equilibrium CO2 Liu‐Helei model absorption heat screening solvent |
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