Understanding the vapour–liquid equilibrium of CO2 in mixed solutions of potassium carbonate and potassium glycinate

Abstract

A thermodynamic model was developed to describe the absorption of CO2 into a glycine promoted potassium carbonate solution. It was found that the model could effectively predict vapour–liquid equilibrium of CO2 and solubility of hydrated potassium carbonate and potassium bicarbonate in glycine promoted K2CO3 solutions over a range of temperatures. Both simulation and experimental results showed CO2 partial pressure decreased with the addition of glycine, indicating a good potential to improve CO2 absorption efficiency in potassium carbonate solution.