Low pressure equilibrium between H_2S and CO_2 over aqueous alkanolamine solution

摘要

The simultaneous absorption of H_2s and CO_2 in aqueous alkanolamine solution is of considerable commercial importance. The reversible nature of reactions always results in equilibrium partial pressure of CH_2 and H_2S over amine solution. A simple method is presented to determine the equilibrium partial pressure having very low loading of H_2S and CO_2 with the select-ion electrode. The entire equilibrium is divided into two parts, namely first equilibrium and the final equilibrium. A (H_2S + CO_2) - aqueous alkanolamine system is highly non-ideal. Therefore, an attempt has been made to correlate data by using 'final equilibrium' expression based on ideal behaviour and then introducing a lumped correction factor (#beta#) to predict observed data between H_2S-CO_2 and diethanolamine solution. This methodology being process engineering friendly can be extended to other systems also.