Experimental study and thermodynamic modelling of methane clathrate hydrate dissociation conditions in silica gel porous media in the presence of methanol aqueous solution

Hamed Hashemi (1) , Jafar Javanmardi (1) , Mojdeh Zarifi (1) , Ali Eslamimanesh (2) , Amir H. Mohammadi (2)

1 Department of Chemical Engineering
2 CEP/Fontainebleau

In this work, the phase equilibria of clathrate hydrates of methane in the presence of pure water and 0.035 mass fraction of methanol aqueous solution in confined silica gel pores with (10 and 15) nm mean diameters are measured and reported. A thermodynamic model is also developed for prediction of the obtained experimental hydrate dissociation data. The Valderrama-Patel-Teja (VPT-EoS) equation of state (EoS) accompanied with the non-density dependent (NDD) mixing rules coupled with a previously developed activity model are applied to evaluate the fugacity of the species present and the activity coefficient of water in methanol aqueous solution. Acceptable agreement between the reported data and the predicted results using the proposed model and an existing method reported in the literature demonstrates the reliability of the presented model.

Mots clés: Experimental data; Gas hydrate; Methanol; Phase equilibria; Porous media; Thermodynamic model; Activity models; Clathrate hydrate; Equation of state; Mass fraction; Mean diameter; Methane clathrate hydrate; Mixing rules; Pure water

Domaines: Génie des procédés

Hamed Hashemi, Jafar Javanmardi, Mojdeh Zarifi, Ali Eslamimanesh, Amir H. Mohammadi. Experimental study and thermodynamic modelling of methane clathrate hydrate dissociation conditions in silica gel porous media in the presence of methanol aqueous solution. Journal of Chemical Thermodynamics, 2012, 49, pp.7-13. ⟨10.1016/j.jct.2012.02.003⟩. ⟨hal-00796556⟩