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Applied Energy 136 (2014) 325–335 Energy consumption analysis for CO2 separation using imidazolium-based ionic liquids Yujiao Xie a,⇑, Yingying Zhang a,b, Xiaohua Lu b, Xiaoyan Ji a,⇑ a Division of Energy Science/Energy Engineering, Luleå University of Technology, 97187 Luleå, Sweden b State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China highlights CO2 solubility in imidazolium-based ionic liquids was surveyed and evaluated. CO2 absorption enthalpy was calculated based on thermodynamic model. The effects of cation and anion on CO2 absorption enthalpy were discussed. Energy consumption for a CO2 separation process was investigated. Contents lists available at ScienceDirect Applied Energy journal homepage: www.elsevier.com/locate/apenergy article info Article history: Received 12 June 2014 Received in revised form 31 August 2014 Accepted 14 September 2014 Keywords: CO2 separation Ionic liquids Energy consumption Imidazolium abstract CO2 solubility in ionic liquids has been measured extensively in order to develop ionic liquid-based technology for CO2 separation. However, the energy consumption analysis has not been investigated well for such technology. In order to carry out the energy consumption analysis for CO2 separation using ionic liquids based on available experimental data, in this work, the experimental data of the CO2 solubility in imidazolium-based ionic liquids at pressures below 10 MPa was surveyed and evaluated by a semi- empirical thermodynamic model firstly. Based on the reliable experimental solubility data, the enthalpy of CO2 absorption was further calculated by the thermodynamic model. The results show that the CO2 absorption enthalpy in the studied ionic liquids is dominated by the enthalpy of CO2 dissolution and the contribution of excess enthalpy increases with increasing CO2 solubility in ionic liquids. The magni- tude of the CO2 absorption enthalpy decreases with increasing chain length in cation and strongly depends on the anion of ionic liquids. Furthermore, the energy consumption for a CO2 separation process by pressure swing and/or temperature swing was investigated. For the pressure swing process, the Henry’s constant of CO2 in ionic liquids is an important factor for energy consumption analysis; If CO2 is absorbed at 298 K and 1 MPa and ionic liquid is regenerated by decreasing the pressure to 0.1 MPa at the same temperature, among the studied ionic liquids, [emim][EtSO4] is the solvent with the lowest energy consumption of 9.840 kJ/mol CO2. For the temperature swing process, the heat capacity of ionic liquids plays a more important role; If CO2 is absorbed at 298 K and desorbed at 323 K and 0.1 MPa, [emim][PF6] is the solvent with the lowest energy demand of 888.9 kJ/mol CO2. If the solvent is regener- ated by releasing pressure and increasing temperature, both the Henry’s constant of CO2 in ionic liquids and the heat capacity of ionic liquids are important for analyzing the energy consumption; If CO2 is absorbed at 298 K and 1 MPa and ionic liquid is regenerated at 323 K and 0.1 MPa, [bmim][Tf2N] is the solvent with the lowest energy consumption of 57.71 kJ/mol CO2. 1. Introduction CO2 capture and separation play an important role in the devel- opment of renewable energy and the mitigating of environmental ⇑ Corresponding authors. Tel.: +46 (0)920 492589 (Y. Xie), +46 (0)920 492837 (X. Ji). E-mail addresses: yujiao.xie@ltu.se (Y. Xie), xiaoyan.ji@ltu.se (X. Ji). http://dx.doi.org/10.1016/j.apenergy.2014.09.046 0306-2619/! 2014 Elsevier Ltd. All rights reserved. ! 2014 Elsevier Ltd. All rights reserved. effects [1–3]. Currently, amine-based technology is still a commer- cial technology, in which amines are corrosive and suffer high solvent loses as well as high energy penalty when used with aque- ous solutions [4,5]. Therefore, it is necessary to explore an energy effective and environmentally benign technology for CO2 separa- tion. A lot of research work is on-going to develop new technolo- gies [6–8]. Recently, ionic liquids (ILs) have shown great potential to be used as liquid absorbents for CO2 separationPDF Image | CO2 Separation with Ionic Liquids
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