Evaluation of a Simplified Model for Three-Phase Equilibrium Calculations of Mixed Gas Hydrates

Panagiotis Kastanidis, George E. Romanos, Athanasios K. Stubos, Georgia Pappa, Epaminondas Voutsas and Ioannis N. Tsimpanogiannis ()
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Panagiotis Kastanidis: Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Aghia Paraskevi, 15310 Athens, Greece
George E. Romanos: Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Aghia Paraskevi, 15310 Athens, Greece
Athanasios K. Stubos: Environmental Research Laboratory, National Center for Scientific Research “Demokritos”, 15310 Aghia Paraskevi Attikis, Greece
Georgia Pappa: Laboratory of Thermodynamics and Transport Phenomena, School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Str., Zografou Campus, 15780 Athens, Greece
Epaminondas Voutsas: Laboratory of Thermodynamics and Transport Phenomena, School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Str., Zografou Campus, 15780 Athens, Greece
Ioannis N. Tsimpanogiannis: Chemical Process & Energy Resources Institute (CPERI), Centre for Research & Technology Hellas (CERTH), 57001 Thessaloniki, Greece

Energies, 2024, vol. 17, issue 2, 1-22

Abstract: In this study, we perform an extensive evaluation of a simple model for hydrate equilibrium calculations of binary, ternary, and limited quaternary gas hydrate systems that are of practical interest for separation of gas mixtures. We adopt the model developed by Lipenkov and Istomin and analyze its performance at temperature conditions higher than the lower quadruple point. The model of interest calculates the dissociation pressure of mixed gas hydrate systems using a simple combination rule that involves the hydrate dissociation pressures of the pure gases and the gas mixture composition, which is at equilibrium with the aqueous and hydrate phases. Such an approach has been used extensively and successfully in polar science, as well as research related to space science where the temperatures are very low. However, the particular method has not been examined for cases of higher temperatures (i.e., above the melting point of the pure water). Such temperatures are of interest to practical industrial applications. Gases of interest for this study include eleven chemical components that are related to industrial gas-mixture separations. Calculations using the examined methodology, along with the commercial simulator CSMGem, are compared against experimental measurements, and the range of applicability of the method is delineated. Reasonable agreement (particularly at lower hydrate equilibrium pressures) between experiments and calculations is obtained considering the simplicity of the methodology. Depending on the hydrate-forming mixture considered, the percentage of absolute average deviation in predicting the hydrate equilibrium pressure is found to be in the range 3–91%, with the majority of systems having deviations that are less than 30%.

Keywords: gas hydrates; hydrate equilibrium pressure; gas-mixture separation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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