<p>Ionic liquids (ILs) and ILs-based solvents have emerged as potential solvents in sequestering CO₂ from industrial emission sources. Notwithstanding, there is a lack of research on implementing and assessing the IL-based processes on various scales, attributed to the high variability of flue gas concentrations and flow rates. This work seeks to fill the research gap by assessing techno-economic ratings of capture technologies using ILs and comparing results with the traditional MEA-based technology. Two prominent CO₂ capture techniques, namely the hybrid (the mixture of IL ([bpy][BF4]) and MEA) and the single IL ([bmim][Ac])-based absorption, are rigorously modeled, simulated, optimized, and heat integrated across different flue gas characteristics (CO₂ concentrations and flow rates). According to a cost-based analysis of the novel and traditional procedures, CO₂ concentration and flow rate markedly affect the economic feasibility and should be reviewed when choosing the suitable capture method for various emission sources. The results reveal that although the hybrid solvent is cost-effective for all scenarios, the single IL-based technique can play a more critical role when the flue gas contains around 30% or more CO₂. Besides, a cost model estimating annual capital and operating expenses of different emission scenarios is provided to aid in developing future carbon management strategies.</p> Graphical abstract <p></p>