Nucleation kinetics of glycine promoted concentrated potassium carbonate solvents for carbon dioxide absorption

Abstract

Glycine promoted concentrated potassium carbonate (K2CO3) solvents are considered to have potential for use in carbon dioxide (CO2) capture processes. Understanding their precipitation behaviour, particularly nucleation kinetics, becomes important if the solvents are used as absorbents at concentrations of 40 wt% or greater. In this work, liquid-solid equilibrium of the quaternary solvent system glycine-potassium carbonate-potassium bicarbonate-water was investigated in an Optimax workstation 1001 at different temperatures. The results were interpreted using a regressed Electrolyte Non Random Two Liquids (ENRTL) thermodynamic model in Aspen PlusTM within an average deviation of 9.2%. Through..