Prediction of CO_2 Solubility in Activated MDEA with an ElectrolyteEquation Of State

摘要

A model is developed to describe the thermodynamic equilibrium of CO_2 in an aqueous solution of MDEA and piperazine at elevated methane pressure. These conditions are commonly encountered in industrial gas treating facilities. Piperazine is often added to accelerate the carbon dioxide absorption reaction. The solubility of CO_2 in MDEA activated with piperazine has been modelled previously using electrolyte NRTL equation (ref.[1])and Pitzer equation(ref.[2]). However, extrapolation of these models at near, critical conditions or at high pressures is not very reliable. In this work a fundamental Equation of State approach is used, to describe these systems.