CO2 solubility in aqueous potassium lysinate solutions at absorber conditions

In this work, CO 2 solubility in aqueous potassium lysinate solutions has been measured for the concentrations of (1.25–3.28)   mol·kg −1 and at temperatures of (313–343)   K. The vapour-liquid equilibrium data were correlated using a Soft model and a semi-empirical (SE) model. The proposed models can match well with the experimental data with AAD within 20%. The heat of absorption for LysK was estimated as about (55–70)   kJ·mol −1 CO 2 absorbed from the solubility data. The lower heat of absorption, compared with that of 30   mass% MEA, will be beneficial for the reduction of regeneration energy.