TY - JOUR
T1 - Thermodynamic modeling of CO2 and H2S solubilities in aqueous DIPA solution, aqueous sulfolane-DIPA solution, and aqueous sulfolane-MDEA solution with electrolyte NRTL model
AU - Zong, Li
AU - Chen, Chau Chyun
PY - 2011/7/25
Y1 - 2011/7/25
N2 - A thermodynamic model developed for CO2 and H2S solubilities in aqueous MDEA solution is extended to cover CO2 and H2S solubilities in aqueous DIPA solution, aqueous sulfolane-DIPA solution, and aqueous sulfolane-MDEA solution. The model makes use of the 2009 version of the electrolyte NRTL model for liquid phase activity coefficient calculations and the PC-SAFT equation of state for vapor phase fugacity coefficient calculations. The NRTL binary parameters for the molecule-electrolyte pairs required for the H2O-DIPA-CO2 ternary and the H2O-sulfolane-DIPA-CO2 quaternary are regressed against the solubility data of CO2 in aqueous DIPA solution and aqueous sulfolane-DIPA solution, respectively. The NRTL binary parameters for the molecule-electrolyte pairs required for the H2O-DIPA-H2S ternary and the H2O-sulfolane-DIPA-H2S quaternary are regressed against the solubility data of H2S in aqueous DIPA solution and aqueous sulfolane-DIPA solution simultaneously. The NRTL binary parameters for the electrolyte-electrolyte pairs involved in the H2O-DIPA-CO2-H2S quaternary are regressed against the solubility data of the acid gas mixtures in aqueous DIPA solution. Likewise, the NRTL binary parameters for the sulfolane-electrolyte pairs required for the H2O-sulfolane-MDEA-CO2 quaternary and the H2O-sulfolane-MDEA-H2S quaternary are regressed against the solubility data of the acid gases in aqueous sulfolane-MDEA solution. The predicted enthalpies of acid gas absorption are compared favorably with the literature data available for the H2O-DIPA-CO2 system, the H2O-DIPA-H2S system, and the H2O-sulfolane-MDEA-CO2 system.
AB - A thermodynamic model developed for CO2 and H2S solubilities in aqueous MDEA solution is extended to cover CO2 and H2S solubilities in aqueous DIPA solution, aqueous sulfolane-DIPA solution, and aqueous sulfolane-MDEA solution. The model makes use of the 2009 version of the electrolyte NRTL model for liquid phase activity coefficient calculations and the PC-SAFT equation of state for vapor phase fugacity coefficient calculations. The NRTL binary parameters for the molecule-electrolyte pairs required for the H2O-DIPA-CO2 ternary and the H2O-sulfolane-DIPA-CO2 quaternary are regressed against the solubility data of CO2 in aqueous DIPA solution and aqueous sulfolane-DIPA solution, respectively. The NRTL binary parameters for the molecule-electrolyte pairs required for the H2O-DIPA-H2S ternary and the H2O-sulfolane-DIPA-H2S quaternary are regressed against the solubility data of H2S in aqueous DIPA solution and aqueous sulfolane-DIPA solution simultaneously. The NRTL binary parameters for the electrolyte-electrolyte pairs involved in the H2O-DIPA-CO2-H2S quaternary are regressed against the solubility data of the acid gas mixtures in aqueous DIPA solution. Likewise, the NRTL binary parameters for the sulfolane-electrolyte pairs required for the H2O-sulfolane-MDEA-CO2 quaternary and the H2O-sulfolane-MDEA-H2S quaternary are regressed against the solubility data of the acid gases in aqueous sulfolane-MDEA solution. The predicted enthalpies of acid gas absorption are compared favorably with the literature data available for the H2O-DIPA-CO2 system, the H2O-DIPA-H2S system, and the H2O-sulfolane-MDEA-CO2 system.
KW - Acid gas solubility
KW - Carbon dioxide
KW - Diisopropanolamine
KW - Electrolyte NRTL model
KW - Enthalpy of absorption
KW - Hydrogen sulfide
KW - Methyldiethanolamine
KW - Sulfolane
KW - Vapor-liquid equilibrium
UR - http://www.scopus.com/inward/record.url?scp=79957642994&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2011.04.007
DO - 10.1016/j.fluid.2011.04.007
M3 - Article
AN - SCOPUS:79957642994
SN - 0378-3812
VL - 306
SP - 190
EP - 203
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
IS - 2
ER -