Measurements and correlations of solubility of N2O in and density, viscosity of partially CO2 loaded water-lean amino acid salts

A mixture system of water-lean amino acid salts (AAS) using ethylene glycol (EG) as a solvent has potential use for CO 2 capture to reduce energy consumption. In this work, physicochemical properties such as density, viscosity and N 2 O solubility of potassium prolinate (ProK) or potassium lysinate (LysK) + water + EG solutions were measured over the temperature range from (303.15 to 353.15) K and molality range from (0.481 to 4.331) mol·kg −1 . Partially CO 2 loaded solutions were also investigated. Densities and viscosities of solutions increase with the increasing molality of AAS and CO 2 , but decrease with the increasing temperature. The use of EG in the aqueous AAS systems replacing water can substantially increase the N 2 O solubility. The Henry’s constants of N 2 O for water-lean AAS solutions were calculated and compared with those for aqueous AAS solutions. These experimental data of properties were correlated using empirical correlations as a function of temperature, molality of AAS and/or CO 2 . The experimental results and the predictions from the models matched well each other for both ProK-based and LysK-based water lean systems, with AAD within 0.12% for density, 2.36% for viscosity and 2.0% for N 2 O solubility respectively.