Abstract
The increase in carbon dioxide (CO2) emissions from process industries, particularly in the oil and gas sector, has led researchers to develop efficient technologies for acid gas removal. Although amine-based solvents such as methyldiethanolamine (MDEA) are widely used in various industries, such as natural gas refineries, they have some limitations, including high energy consumption during solvent regeneration and limited CO2 absorption performance. Despite recent advances in the application of ionic liquids, integrated techno-economic and thermodynamic assessments of amine–ionic liquid hybrid solvents under pre-combustion conditions remain scarce. In this study, for the first time, the performance of a hybrid solvent system comprising the ionic liquid [P2228]⁺[2-CNPyr]⁻ and MDEA was investigated via process simulation in Aspen Plus. The modeling was carried out using the Electrolyte NRTL (ELECNRTL) thermodynamic model, along with a techno-economic analysis for comparison with the benchmark MDEA solvent. The results showed that the use of the hybrid solvent led to a 46.67 % reduction in reboiler energy consumption and a decrease in operating costs from $8.381 to $6.752 per hour. In addition, solvent consumption for CO2 and H2S absorption decreased by 52.52 % and 59.52 %, respectively, indicating a significant improvement in process performance. Overall, Amine–ionic liquid can be considered a promising option for reducing energy consumption and operational costs in pre‑combustion capture processes, and it provides a basis for further experimental investigations and industrial application of this technology.