Absorption of H2S and CO2 in Alkanolamine Aqueous Solution: Experimental Data and Modelling with the Electrolyte-NRTL Model

Overview & Synopsis

In this work, we are interested in acid gas (H2S and CO2) removal by aqueous solutions of alkanolamine. The first part of the article deals with the development of the experimental apparatus used to determine the partial acid gas pressure as a function of acid gas loading in the reactive liquid phase with the synthetic method. New measurements on water + diethanolamine + CO2 and water + diethanolamine + H2S systems were performed. The second part concerns the modelling of such data. The model used couples the chemical reactions in liquid phase with the phase equilibrium. We use the electrolyte NRTL model for the liquid phase and the Peng and Robinson equation of state to describe the vapour phase. The parameters of the electrolyte NRTL model are determined on experimental acid gas partial pressure data of the studied systems.