Analysis of equilibrium CO2 solubility and thermodynamic models for aqueous 1-(2-hydoxyethyl)-piperidine solution |
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| Authors: | Min Xiao Wenchao Zheng Helei Liu Paitoon Tontiwachwuthikul Zhiwu Liang |
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| Affiliation: | 1. Joint International Center for CO2 Capture and Storage (iCCS), Hunan Provincial Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha, People's Republic of China;2. Faculty of Engineering and Applied Science, Clean Energy Technologies Research Institute, University of Regina, Regina, Saskatchewan, Canada |
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| Abstract: | 1-(2-Hydoxyethyl)-piperidine (1-(2HE)-PP) is a new tertiary amine with desirable properties and can be potentially used to formulate superior absorbents for CO2 capture. The equilibrium CO2 solubility of 1-(2HE)-PP solution is measured over temperatures from 298 to 333 K, CO2 partial pressures from 8.1 to 101.3 kPa and initial amine concentrations from 1 to 5 M. Two thermodynamic models, namely semiempirical model and activity coefficient model are developed for the system. The activity coefficient model shows better estimation solubility with an absolute average relative deviation (AARD) of 7.6%. In the comparison between the two models, a comprehensive analysis is presented. Some suggestions are provided for the similar model development. In addition, the speciation plot of CO2 loaded 1-(2HE)-PP solution is predicted based on the activity coefficient model. The predictive pH values agree well with experimental data with AARD of 1.0%. Finally, the potential of 1-(2-HE)PP to be an alternative amine in CO2 capture is evaluated. |
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| Keywords: | 1-(2-hydoxyethyl)-piperidine CO2 capture equilibrium CO2 solubility speciation thermodynamic model |
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