Abstract This research focuses on the simulation, evaluation and comparison of the separation performance of the pressure swing adsorption (PSA) and amine‐based absorption (ABS) processes in synthesis gas (syngas) /carbon dioxide (CO 2) separation. The main objective of this work is to produce a syngas stream with purity and composition suitable for feeding a Fischer–Tropsch reactor for synthetic fuel production. Simulations were conducted using Aspen Plus® v10 and Aspen Adsorption® v10 software. Evaluation involves multi‐criteria assessment (GREENSCOPE) within the Brazilian context. This assessment considers four scores: efficiency (syngas purity), energy (energy intensity), environment (global warming potential), and economics (minimum selling price of synthesis gas). The PSA process achieves 83. 91% syngas purity, 0. 30 MJ/kg syngas energy intensity, 0. 004 kg CO 2‐eq /kg syngas global warming potential, and 0. 06 US/kg syngas minimum selling price. Conversely, the ABS process achieves 97. 21% syngas purity, 15. 31 MJ/kg syngas energy intensity, 0. 487 kg CO 2‐eq/ kg syngas global warming potential, and 0. 33 US/kg syngas minimum selling price. The PSA process shows superior performance across all scores, except for efficiency, which shows similar scores for both processes.
Santos et al. (2026) studied this question.