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3.3 Process simulation for CO2 separation The process for CO2 separation from biogas (i.e. biogas upgrading) with aqueous ILs was simulated in Aspen Plus, and the schematic of the conceptual process is illustrated in Figure 3.2, including CO2 absorption, flash (gas recirculation) and solvent regeneration. (1) CO2 absorption. The biogas is pressurized to 8 bar in the compressors and injected into the bottom of the absorber, and the solvent is sprayed from the top of the absorber. CH4 is obtained on the top of the absorber. (2) Flash (gas recirculation). The CO2-enriched solvent enters the flash. The gas released from flash is recirculated to the second compressor and mixed with the raw biogas. (3) Solvent regeneration. The CO2-enriched solvent is sent to the desorber and regenerated by decreasing the pressure to 1 bar with an aeration of air using a blower. The solvent leaving from the bottom of desorber is recirculated and mixed with make-up solvent. When the dry ILs were used as the solvent to separate CO2, the desorber is replaced by the flash tank, and the solvent is regenerated by decreasing the pressure due to the low vapor pressure of ILs. Figure 3.2. The schematic of CO2 separation process with aqueous ILs. In simulation, the biogas was assumed to be a mixture of 55% CH4 and 45% CO2. The simulation was based on the equilibrium approach. The purity of CH4 in the product gas (PG) was set to be 0.97 by varying the amount of ILs. The process parameters used in simulation are listed in Table 3.2. 18PDF Image | CO2 Separation with Ionic Liquids
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