MODELIZATION AND SIMULATION OF THE ABSORPTION OF CO2 AND H2S INTO MIXED ALKANOLAMINE SOLUTIONS

A calculation model has been developed to numerically interpret the si multaneous mass transfer behaviour occurring in the absorption of CO2 and H2S into blended alkanolamines. For this study we have used the am ine couple methyldiethanolamine (MDEA) and diethanolamine (DEA). The f ilm and approximate film theories are used to describe the mass transf er phenomena within the liquid phase. The zwitterion reaction mechanis m has been used to describe the reaction between CO2 and the alkanolam ines, and the Deshmukh-Mather thermodynamic model has been implemented . Reference species for the correction factor used in the approximate film theory are compared The effect of H2S on the absorption of CO2 is studied and the effect of the individual reactions between CO2 and th e alkanolamines within the global kinetic scheme is quantified.