Removal of carbon dioxide from flue gases with aqueous MEA solution containing ethanol |
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| Affiliation: | 1. Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Germany;2. BASF SE, Ludwigshafen, Germany;1. Department of Chemical Engineering, Curtin University of Technology Australia, GPO BOX U1987, Perth, WA 6845, Australia;2. CSIRO Energy Centre, 10 Murray Dwyer Circuit, Mayfield West, NSW 2304, Australia;1. Institute of Plant and Process Technology, Technische Universität München, Boltzmannstrasse 15, Garching, 85748, Germany;2. RWE Power Aktiengesellschaft, Huyssenallee 2, Essen, 45128, Germany;1. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China;2. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;1. Department of Chemical Engineering, Indian Institute of Technology, Guwahati 781039, India;3. Salt and Marine Chemicals Discipline, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India |
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| Abstract: | Adding ethanol to an aqueous amine solution offers several advantages for post-combustion CO2 capture. The equilibrium isotherms at higher temperatures shift towards lower loadings, leading to an easier desorption. At constant temperature in the desorber bottom, the desorber pressure is increased, leading to energy savings in the CO2 compression. Alternatively, at constant desorber pressure, the temperature in the desorber bottom is decreased, leading to a smaller efficiency drop of the power plant. Furthermore, the absorption rate of CO2 is enhanced by adding ethanol. In the present work, the potential of using ethanol as a co-solvent for a 0.3 g/g aqueous monoethanolamine (MEA) solution is assessed based on simulations with an equilibrium stage model. A major drawback is the volatility of ethanol. The recovery of ethanol can be achieved using a water scrubber and subsequent stripping. The recovered ethanol vapor is sent directly to the desorber for heat integration. The process with ethanol recovery results in an increased complexity of the capture plant, difficulties in controlling the water balance and higher investment costs and offers, if any, only a moderate energetic advantage. The process concept could, however, be used for other co-solvents with similar properties as ethanol but lower vapor pressures. |
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| Keywords: | Reactive absorption Novel solvents Non-aqueous amine solvent |
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