Thermodynamic Consistency Test for Binary Gas + Water Equilibrium Data at Low and High Pressures

doi:10.1016/S1004-9541(13)60575-3

Abstract

Abstract: Phase equilibrium in binary gas + water mixtures over wide ranges of temperatures and pressures are modeled and tested for thermodynamic consistency. For modeling, the Peng-Robinson equation of state was used and the Wong-Sandler mixing rules were incorporated into the equation of state parameters. In the Wong-Sandler mixing rules the van Laar model for the excess Gibbs energy was applied. In addition, a reasonable and flexible method is applied to test the thermodynamic consistency of pressure-temperature-concentration (P-T-x) data of these binary mixtures. Modeling is found acceptable in all cases, meaning that deviations in correlating the pressure and the gas phase concentration are low. For all cases the thermodynamic consistency method gives a clear conclusion about consistency or inconsistency of a set of experimental P-T-x data.

Key words: vapor-liquid equilibrium, gas-water systems, Wong-Sandler mixing rule, thermodynamic consistency test

摘要： Phase equilibrium in binary gas + water mixtures over wide ranges of temperatures and pressures are modeled and tested for thermodynamic consistency. For modeling, the Peng-Robinson equation of state was used and the Wong-Sandler mixing rules were incorporated into the equation of state parameters. In the Wong-Sandler mixing rules the van Laar model for the excess Gibbs energy was applied. In addition, a reasonable and flexible method is applied to test the thermodynamic consistency of pressure-temperature-concentration (P-T-x) data of these binary mixtures. Modeling is found acceptable in all cases, meaning that deviations in correlating the pressure and the gas phase concentration are low. For all cases the thermodynamic consistency method gives a clear conclusion about consistency or inconsistency of a set of experimental P-T-x data.

关键词: vapor-liquid equilibrium, gas-water systems, Wong-Sandler mixing rule, thermodynamic consistency test

Claudio A. Faúndez, Felipe A. Quiero, José O. Valderrama. Thermodynamic Consistency Test for Binary Gas + Water Equilibrium Data at Low and High Pressures[J]. Chin.J.Chem.Eng., 2013, 21(10): 1172-1181.

Claudio A. Faúndez, Felipe A. Quiero, José O. Valderrama. Thermodynamic Consistency Test for Binary Gas + Water Equilibrium Data at Low and High Pressures[J]. Chinese Journal of Chemical Engineering, 2013, 21(10): 1172-1181.

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