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Content Abstract ............................................................................................................................................... i Appended publications.....................................................................................................................iii 1 Introduction .................................................................................................................................... 1 1.1 Background..............................................................................................................................1 1.2 CO2 separation technologies ................................................................................................... 1 1.3 Ionic liquids (ILs) .................................................................................................................... 3 1.4 Objectives and outline.............................................................................................................5 2 Experiment......................................................................................................................................7 2.1 IL preparation ......................................................................................................................... 7 2.1.1 Materials............................................................................................................................7 2.1.2 Synthesis of choline chloride/urea...................................................................................7 2.1.3 Synthesis of 1-allyl-3-methylimidazolium formate ........................................................ 8 2.2 Density and viscosity measurement ....................................................................................... 8 2.3 Gas solubility measurement....................................................................................................9 3 Theory and methodology ............................................................................................................. 11 3.1 Thermodynamic modeling .................................................................................................... 11 3.1.1 Modeling properties of ILs ............................................................................................ 11 3.1.2 Modeling phase equilibria ............................................................................................. 13 3.2 Energy analysis ...................................................................................................................... 16 3.3 Process simulation for CO2 separation ................................................................................ 18 4 Results and discussion..................................................................................................................21 4.1 Evaluation and analysis on conventional ILs......................................................................21 4.1.1 Data evaluation on CO2 solubility.................................................................................21 4.1.2 CO2 absorption enthalpy................................................................................................ 22 4.1.3 Energy demand for solvent regeneration ..................................................................... 24 4.1.4 CH4 solubility and properties of ILs ............................................................................. 26 4.2 Measurement and modeling on novel ILs ........................................................................... 28 4.2.1 Density and viscosity ...................................................................................................... 28 4.2.2 CO2 and CH4 solubility .................................................................................................. 30 4.2.3 Discussion on water effect on the properties of ILs.....................................................33 4.3 Performance evaluation for biogas upgrading ................................................................... 37 4.3.1 Parameter and implementation..................................................................................... 38 4.3.2 Biogas upgrading using ILs ........................................................................................... 41 viiPDF Image | CO2 Separation with Ionic Liquids
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