Model Development of Amine Regeneration Process with Electrodialysis Reclamation Unit

In this study, we developed a model of amine regeneration process with electrodialysis reclamation unit based on the removal of heat stable amine salt (HSAS) and conducted techno-economic analysis (TEA) by applying the developed model. The HSAS produced in the amine regeneration process acted as a corrosive factor and reduced the efficiency of heat exchanger and the amount of amine available. During development, the model was divided into the amine gas sweetening process and amine regeneration unit construction. The thermodynamic equation considered electrolyte phase equilibrium using the electrolyte nonrandom two liquid model. A RadFrac model was used for regeneration, the removal process of H₂S, and the HSAS removal unit considered the reaction with the sodium hydroxide solution by utilizing the RCSTR model. According to TEA, the total capital investment increased by $1,823,530, but the total plant cost decreased by $485,994; therefore, the payback period was calculated at 3.75 y. We believe that the model could provide a guideline for process application if implemented for the optimization of other variables, such as the consumption of raw materials.