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for water scrubbing is quite large due to the large amount of recirculated water because of the low CO2 solubility in water. The vacuum pump was needed only for the process with [bmim][Tf2N], resulting in a higher energy demand compared to aqueous ChCl/Urea and aqueous [Amim][HCOO]. Compared to water scrubbing, the total energy demand for [bmim][Tf2N] scrubbing decreases about 10 %, while the energy demand for aqueous [Amim][HCOO] scrubbing decreases around 30 %. Therefore, in the next section, aqueous [Amim][HCOO] scrubbing was chosen as a reference case when integrating the upgrading process with the anaerobic digestion process. Table 4.10. The energy demands of the biogas upgrading process with different solvents. Unit H2O [bmim][Tf2N] 50% ChCl/Urea 90% [Amim][HCOO] + 50% H2O* + 10% H2O* Make-up solvent, t/h 0.71 46 13 0.33 22 13 0.15 9.0 12 0.12 7.8 12 Recirculated solvent, /h Power, kW COMP 1 COMP 2 PUMP VACUUM PUMP BLOWER Total Total, kWh/ Nm3 14 15 - 3.6 46 0.20 14 6.6 7.5 - 41 0.18 13 4.0 - 3.6 33 0.15 11 3.7 - 3.6 30 0.14 *wt% 4.3.4 Integration of biogas upgrading In order to promote the application of IL-based technology, the unit of biogas upgrading was integrated with anaerobic digestion processes. The composition of raw biogas with respect to CH4 concentration and gas flow rate are dependent on the type and amount of substrate as well as the configuration of anaerobic digestion process. The amount of raw gas and the methane content of the raw gas were collected from six different co-digestion plants in Sweden and Norway. The amount of raw gas is from 0.44 106 to 3.86 106 Nm3/year, and the methane content of the raw gas is ranging from 61 % to 69 %. A sensitivity analysis was performed to investigate the effect of methane content and raw gas flow rate on energy 45PDF Image | CO2 Separation with Ionic Liquids
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