Theory of Dissociation Pressures of Some Gas Hydrates

McKoy, Vincent; Si̇nanoğlu, Oktay

doi:10.1063/1.1733625

Cited by 273 publications

(154 citation statements)

References 11 publications

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“…Following McKoy & Sinanoglu (1963), this potential w(r) can be written for a spherical guest molecule, as…”

Section: Clathrate Hydrates Compositionmentioning

confidence: 99%

Clathrate hydrates as a sink of noble gases in Titan's atmosphere

Thomas¹,

Mousis²,

Ballenegger³

et al. 2007

A&A

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We use a statistical thermodynamic approach to determine the composition of clathrate hydrates which may form from a multiple compound gas whose composition is similar to that of Titan's atmosphere. Assuming that noble gases are initially present in this gas phase, we calculate the ratios of xenon, krypton and argon to species trapped in clathrate hydrates. We find that these ratios calculated for xenon and krypton are several orders of magnitude higher than in the coexisting gas at temperature and pressure conditions close to those of Titan's present atmosphere at ground level. Furthermore we show that, by contrast, argon is poorly trapped in these ices. This trapping mechanism implies that the gas-phase is progressively depleted in xenon and krypton when the coexisting clathrate hydrates form whereas the initial abundance of argon remains almost constant. Our results are thus compatible with the deficiency of Titan's atmosphere in xenon and krypton measured by the Huygens probe during its descent on January 14, 2005. However, in order to interpret the subsolar abundance of primordial Ar also revealed by Huygens, other processes that occurred either during the formation of Titan or during its evolution must be also invoked.

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“…Following McKoy & Sinanoglu (1963), this potential w(r) can be written for a spherical guest molecule, as…”

Section: Clathrate Hydrates Compositionmentioning

confidence: 99%

Clathrate hydrates as a sink of noble gases in Titan's atmosphere

Thomas¹,

Mousis²,

Ballenegger³

et al. 2007

A&A

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“…For the small cage we adopt the guesthost potential of interaction formalism given in McKoy & Sinanoǧlu (1963). This formalism accounts for non-covalent forces only modelled by a Kihara potential.…”

Section: Co 2 Solubility Inside Its Clathrate Hydrate Stability Fieldmentioning

confidence: 99%

The Abundance of Atmospheric CO₂ in Ocean Exoplanets: a Novel CO₂ Deposition Mechanism

Levi

Sasselov

Podolak

2017

ApJ

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We consider super-Earth sized planets which have a water mass fraction that is large enough to form an external mantle composed of high pressure water ice polymorphs and that lack a substantial H/He atmosphere. We consider such planets in their habitable zone so that their outermost condensed mantle is a global deep liquid ocean. For these ocean planets we investigate potential internal reservoirs of CO 2 ; the amount of CO 2 dissolved in the ocean for the various saturation conditions encountered, and the ocean-atmosphere exchange flux of CO 2 . We find that in steady state the abundance of CO 2 in the atmosphere has two possible states. When the wind-driven circulation is the dominant CO 2 exchange mechanism, an atmosphere of tens of bars of CO 2 results, where the exact value depends on the subtropical ocean surface temperature and the deep ocean temperature. When sea-ice formation, acting on these planets as a CO 2 deposition mechanism, is the dominant exchange mechanism, an atmosphere of a few bars of CO 2 is established. The exact value depends on the subpolar surface temperature. Our results suggest the possibility of a negative feedback mechanism, unique to water planets, where a reduction in the subpolar temperature drives more CO 2 into the atmosphere to increase the greenhouse effect.

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“…Originally, van der Waals and Platteeuw (1959) considered London interaction between gas and water in hydrate using Lenard-Jones potential function. In this line, McKoy and Sinanoglu (1963) pointed out spherical core Kihara potential function more accurately accounts for interactions in hydrate clathrate, that is,…”

Section: Literature Surveymentioning

confidence: 99%

New insight into prediction of phase behavior of natural gas hydrate by different cubic equations of state coupled with various mixing rules

Dehaghani

2017

Pet. Sci.

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Progress in hydrate thermodynamic study necessitates robust and fast models to be incorporated in reservoir simulation softwares. However, numerous models presented in the literature makes selection of the best, proper predictive model a cumbersome task. It is of industrial interest to make use of cubic equations of state (EOS) for modeling hydrate equilibria. In this regard, this study focuses on evaluation of three common EOSs including Peng-Robinson, Soave-Redlich-Kwong and Valderrama-Patel-Teja coupled with van der Waals and Platteeuw theory to predict hydrate P-T equilibrium of a real natural gas sample. Each EOS was accompanied with three mixing rules, including van der Waals (vdW), Avlonitis non-density dependent (ANDD) and general nonquadratic (GNQ). The prediction of cubic EOSs was in sufficient agreement with experimental data and with overall AARD% of less than unity. In addition, PR plus ANDD proved to be the most accurate model in this study for prediction of hydrate equilibria with AARD% of 0.166. It was observed that the accuracy of cubic EOSs studied in this paper depends on mixing rule coupled with them, especially at high-pressure conditions. Lastly, the present study does not include any adjustable parameter to be correlated with hydrate phase equilibrium data.

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Theory of Dissociation Pressures of Some Gas Hydrates

Cited by 273 publications

References 11 publications

Clathrate hydrates as a sink of noble gases in Titan's atmosphere

Clathrate hydrates as a sink of noble gases in Titan's atmosphere

The Abundance of Atmospheric CO₂ in Ocean Exoplanets: a Novel CO₂ Deposition Mechanism

New insight into prediction of phase behavior of natural gas hydrate by different cubic equations of state coupled with various mixing rules

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Theory of Dissociation Pressures of Some Gas Hydrates

Cited by 273 publications

References 11 publications

Clathrate hydrates as a sink of noble gases in Titan's atmosphere

Clathrate hydrates as a sink of noble gases in Titan's atmosphere

The Abundance of Atmospheric CO2 in Ocean Exoplanets: a Novel CO2 Deposition Mechanism

New insight into prediction of phase behavior of natural gas hydrate by different cubic equations of state coupled with various mixing rules

Contact Info

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Resources

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The Abundance of Atmospheric CO₂ in Ocean Exoplanets: a Novel CO₂ Deposition Mechanism