<p>Reducing greenhouse gas (GHG) emissions, particularly CO₂, is a significant issue in addressing global warming and climate change. Marine CO₂ emissions are also a major concern. The International Maritime Organization (IMO) has implemented numerous regulations to reduce GHG emissions from international shipping. Due to certain limitations and challenges for shipboard operation, post-combustion carbon capture technology is considered the most promising strategy in the near term for maritime applications. In this work, two different absorbents, an amine solution and a sodium hydroxide solution, are considered for the absorption of CO₂ from marine exhaust. For each absorbent, two processes are considered: a single-tower process and two-tower process. In a two-tower process the absorbent is regenerated on the ship, while in a single-tower process fresh and spent solution are stored onboard before spent solution is offloaded at port. Although single-tower processes reduce onboard equipment complexity, they require substantial volumes for lean and rich solutions, which impose practical limitations on the achievable CO₂ removal rate under shipboard space constraints. Aspen Plus and sea-trial data are used to model the processes for application on a bulk goods transport ship. The study aims to compare the operational feasibility of both systems under the constraints of a moving ship.</p>