Modeling of structure H hydrate equilibria for methane, intermediate hydrocarbon molecules and water systems

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:418173

Thomas, M; Behar, E ^[1]

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1. Inst. Francais du Petrole, Rueil-Malmaison (France)

Clathrate hydrates are inclusion compounds in which guest molecules are engaged by water molecules under favorable conditions of pressure and temperature. The well known structures 1 and 2 have been discovered since last century, while a new structure called H has been recently described in the literature. Since that time, structure H hydrate equilibrium data involving methane and different intermediate liquid hydrocarbon molecules have been published. The equilibrium calculations involving hydrates are based on the fact that the chemical potential of water in the aqueous liquid phase is equal to the one in the hydrate phase. The chemical potential of water in the liquid aqueous phase can be easily described by classical thermodynamic relations, while the chemical potential of water in the hydrates phase is described by the expressions proposed by Van der Walls and Platteeuw derived from an adsorption model based on statistical thermodynamics. The authors present in this paper a set of Kihara potential parameters which enable the calculation of Langmuir constants which characterize the adsorption of some naphthenic and iso-paraffinic intermediate hydrocarbons in the larger cage of structure H hydrates. This work thus allows the computation of structural H hydrate equilibrium conditions for systems made of methane, intermediate hydrocarbon molecules and water.

• OSTI ID: 418173
• Report Number(s): CONF-960348--
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
ALKANES
GAS HYDRATES
HYDROAROMATICS
MATHEMATICAL MODELS
NATURAL GAS
PHASE STUDIES
THERMODYNAMIC PROPERTIES