Process Simulations of the Direct Non-Aqueous Gas Stripping Process for CO2 Desorption

Abstract

The integration of the direct steam stripping (DSS) process with organic working fluid promises a significant reduction in the energy penalty for the CO2 capture process. This work investigates the mechanisms of the mass transfer enhancement in direct pentane stripping (DPS) process using simulation methods. Through regressing the molecule-molecule interaction parameters, a quaternary system thermodynamic model (QSTM) is developed to successfully predict the vapor-liquid equilibrium of Amine/CO2/Pentane/H2O system. Three typical solvents, monoethanolamine (MEA), methyldiethanolamine (MDEA), and 2-amino-2-methyl-1-propanol (AMP) are studied in this work. The DPS process using 30 wt.% MEA, 30 wt.%MDEA, and 30 wt.% AMP exhibits the solvent regeneration energy of 2.55, 2.65, and 2.01 GJ/tCO2 under the optimal conditions, which is 34%, 32%, and 48% lower than of the conventional MEA-based process. DPS using MDEA shows an energy advantage over the other two solvents because of the high CO2 equilibrium partial p...