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Molecular dynamics and thermodynamical modelling using SAFT-VR to predict hydrate phase equilibria : application to CO2 hydrates

Miguez, Jose Manuel and Miqueu, Christelle and Mendiboure, Bruno and Torré, Jean-Philippe and Blas, Felipe and Pinero, Manuel and Conde, Maria Martin and Vega, Carlos Molecular dynamics and thermodynamical modelling using SAFT-VR to predict hydrate phase equilibria : application to CO2 hydrates. (2014) In: 8th International Conference on Gas Hydrates (ICGH8), 28 July 2014 - 1 August 2014 (Beijing, China).

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Abstract

This work was dedicated to the prediction of the three phase coexistence line (CO2 hydrate–liquid H2Oliquid/vapour CO2) for the H2O+CO2 binary mixture by using (i) molecular dynamics simulations, and (ii) the well known van der Waals-Platteeuw (vdWP) model combined with the SAFT-VR equation of state. Molecular dynamics simulations have been performed using the simulation package GROMACS. The temperature at which the three phases are in equilibrium was determined for different pressures, by using direct coexistence simulations. Carbon dioxide was modelled as a linear-rigid chain molecule with three chemical units, the well-known version TraPPE molecular model. The TIP4P/Ice model was used for water. To perform the thermodynamical modelling, the SAFT-VR EOS was incorporated in the vdWP framework. The values of the cell model parameters were regressed and discussed together with the influence of some assumptions of the vdWP model. Since SAFT-VR can describe most of fluids involved in hydrate modelling (inhibitors, salts…), this study is a first step in the description of hydrate forming conditions of more complex systems. Finally, the three-phase coexistence temperatures obtained with both simulations and theory at different pressures were compared with experimental results

Item Type:Conference or Workshop Item (Poster)
HAL Id:hal-02020350
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Total (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
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Deposited By: Jean-philippe TORRE
Deposited On:15 Feb 2019 10:07

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