| Summary: | Air-independent propulsion systems have improved the performance and decreased the vulnerability of underwater weapon systems. Reforming systems, however, generates large amounts of water and CO<sub>2</sub>. The recovery or separation of CO<sub>2</sub>, a residual gas component generated in vessels, entails considerable cost and energy consumption. It is necessary to understand the characteristics of the interaction between CO<sub>2</sub> and seawater under the conditions experienced by underwater weapon systems to design and optimize a CO<sub>2</sub> treatment process for dissolving CO<sub>2</sub> in seawater. In this study, numerical analysis was conducted using the derived experimental concentration and MATLAB. The diffusion coefficient was derived as a function of temperature according to the CO<sub>2</sub> dissolution time. Experiments on CO<sub>2</sub> dissolution in seawater were conducted. The concentration of CO<sub>2</sub> according to the reaction pressure and experimental temperature was obtained. The diffusion coefficient between CO<sub>2</sub> and seawater was found to be 6.3 × 10<sup>−5</sup> cm<sup>2</sup>/s at 25 °C and 7.24 × 10<sup>−5</sup> cm<sup>2</sup>/s at 32 °C. CO<sub>2</sub> concentration could be estimated accurately under vessel operating conditions using the derived CO<sub>2</sub> diffusion coefficients. Optimal design of the residual gas treatment process will be possible using the derived seawater−CO<sub>2</sub> diffusion coefficients under the actual operating conditions experienced by underwater weapon systems.
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