Ionic liquids for post-combustion CO2 absorption |
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| Authors: | D Wappel G Gronald R Kalb J Draxler |
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| Institution: | 1. University of Leoben, Institute of Process Technology and Industrial Environmental Protection, Franz-Josef-Straße 18, Leoben, 8700, Austria;2. AE&E Austria GmbH & Co KG, Waagner-Biro-Platz 1, Raaba/Graz, 8074, Austria;3. Proionic Production of Ionic Substances GmbH, Parkring 18, Grambach, 8074, Austria;1. Institut de Chimie de Clermont-Ferrand, Equipe Thermodynamique et Interactions Moléculaires, Clermont Université, Université Blaise Pascal, BP 80026, 63171 Aubière, France;2. CNRS, UMR 6296 ICCF, BP 80026, 63171 Aubière, France;3. Université de Lyon, Institut de Chimie de Lyon, UMR 5265 CNRS-Université de Lyon 1-ESCPE Lyon, C2P2, Equipe Chimie Organométallique de Surface, ESCPE 43 Boulevard du 11 Novembre 1918, 69616 Villeurbanne, France;1. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China;2. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;1. Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;4. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The present work is a study to evaluate ionic liquids as a potential solvent for post-combustion CO2 capture. In order to enhance the absorption performance of a CO2 capture unit, different ionic liquids have been designed and tested. The main goal was to get a comparison between a reference liquid and selected ionic liquids. As the reference, a solution of 30 w% monoethanolamine (MEA) and water was used. A large range of different pure and diluted ionic liquids was tested with a special screening process to gain general information about the CO2 absorption performance. Based on these results, a 60 w% ionic liquid solution in water was selected and the vapour–liquid equilibrium was measured experimentally between 40 °C and 110 °C. From these curves the enthalpy of absorption for capturing CO2 into the ionic liquid was determined. With these important parameters one is able to calculate the total energy demand for stripping of CO2 from the loaded solvent for comparison of the ionic liquid based solvent with the reference MEA solvent. The energy demand of this 60 w% ionic liquid is slightly lower than that of the reference solution, resulting in possible energy savings between 12 and 16%. |
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