Vapor-liquid equilibrium calculation of H2S-CO2-alkanolamine solution using Gibbs free energy minimization

Equilibrium calculations of H2S-CO2-alkanolamine solutions (MEA, DEA, DGA, MDEA and DIPA) are performed using. the Gibbs free energy minimization. Two equations for chemical potential as a function of temperature mid loading for amine and its carbamate derivative are proposed and their coefficients are determined and reported. Partial pressures of H2S, CO2 over alkanolamine solutions are predicted and compared with experimental data and also with the modified Kent-Eisenberg model. Overall, the accuracy of the model is good and, in some cases, better results than those of the modified Kent-Eisenberg model sire obtained.