(558al) Equilibrium Solubility, Modeling and Enthalpy of CO2 Absorption in Aqueous Blend of Methyldiethanolamine and Arginine at Low Pressure

In this work, the effect of arginine (ARG) addition on the solubility of CO₂ in an aqueous blend solution of methyldiethanolamine (MDEA) is presented. The study was carried out at different mixing ratios of MDEA and ARG at a total solution concentration of two moles. The blend solvents were subject to different flows of CO₂/N₂ mixtures to determine the effect of varying CO₂ partial pressure. The temperature was varied from 293 to 323 K. The results showed that the solubility of CO₂ remarkably improves with ARG concentration at CO₂ partial pressure below 20 kPa and slightly decrease after that. The obtained data were modeled using a semi-empirical (SE) vapor liquid equilibrium (VLE) model and the heat of CO₂ absorption (ΔH_abs) was estimated using the same semi-empirical model.