Modeling heating curve for gas hydrate dissociation in porous media

• Published in: The Journal of Physical Chemistry B
• Main Authors: Dicharry, Christophe, Gayet, P., Marion, G., Graciaa, Alain, Nesterov, A.
• Other Authors: Thermodynamique et Energétique des fluides complexes (TEFC), Université de Pau et des Pays de l'Adour (UPPA)-TOTAL SA-Centre National de la Recherche Scientifique (CNRS), Institute of earth cryosphère, SB RAS P.O. 1230
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2005
• Subjects: [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]; Methane hydrate
• Online Access: https://hal.science/hal-00343004; https://doi.org/10.1021/jp0504975

International audience A method for modeling the heating curve for gas hydrate dissociation in porous media at isochoric conditions (constant cell volume) is presented. This method consists of using an equation of state of the gas, the cumulative volume distribution (CVD) of the porous medium, and a van der Waals-Platteeuw-type thermodynamic model that includes a capillary term. The proposed method was tested to predict the heating curves for methane hydrate dissociation in a mesoporous silica glass for saturated conditions (liquid volume = pore volume) and for a fractional conversion of water to hydrate of 1 (100% of the available water was converted to hydrate). The shape factor (F) of the hydrate-water interface was found equal to 1, supporting a cylindrical shape for the hydrate particles during hydrate dissociation. Using F = 1, it has been possible to predict the heating curve for different ranges of pressure and temperature. The excellent agreement between the calculated and experimental heating curves supports the validity of our approach.