In this study, vapour-liquid equilibrium of CO2-loaded aqueous potassium salt of L-histidine was studied for a wide range of\ntemperature (313.15-353.15 K), pressure (150-4000 kPa), and solvent concentrations (1-2.5 molar).The experimental results\nshow that L-histidine has an excellent absorptive capacity for carbon dioxide. When compared to conventional solvent\n(monoethanolamine) and amino acid salt (potassium L-lysinate) at similar process conditions, L-histidine has superior absorption\ncapacity. Moreover, modified Kent-Eisenberg model was used to correlate the VLE of the studied system with excellent agreement\nbetween the model and experimental values. The model exhibited an AARE% of 7.87%, which shows that it can satisfactorily\npredict carbon dioxide solubilities in aqueous potassium salt of L-histidine at other process conditions. Being a biological\ncomponent in origin, almost negligibly volatile, and highly resistant to oxidative degradation, L-histidine offers certain operational\nadvantages over other solvents used and has a promising potential for carbon dioxide capture.
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