Kinetics of the Formation and Dissociation of Gas Hydrates from CO2-CH4 Mixtures

doi:10.3390/en5072248

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Energies 2012, 5(7), 2248-2262; doi:10.3390/en5072248

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Kinetics of the Formation and Dissociation of Gas Hydrates from CO₂-CH₄ Mixtures

Kristine Horvat¹, Prasad Kerkar¹, Keith Jones¹ and Devinder Mahajan^1,2,*

¹ Materials Science and Engineering Department, Stony Brook University, Stony Brook, New York, NY 11794, USA ² Sustainable Energy Technologies Department, Brookhaven National Laboratory, Upton, New York, NY 11973-5000, USA

* Author to whom correspondence should be addressed.

Received: 6 February 2012; in revised form: 3 May 2012 / Accepted: 25 May 2012 / Published: 6 July 2012

(This article belongs to the Special Issue Natural Gas Hydrate 2011)

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Abstract: Sequestration of carbon dioxide (CO₂) in the form of its hydrates in natural methane (CH₄) hydrate reservoirs, via CO₂/CH₄ exchange, is an attractive pathway that also yields valuable CH₄ gas as product. In this paper, we describe a macroscale experiment to form CO₂ and CH₄-CO₂ hydrates, under seafloor-mimic conditions, in a vessel fitted with glass windows that provides visualization of hydrates throughout formation and dissociation processes. Time resolved pressure and temperature data as well as images of hydrates are presented. Quantitative gas conversions with pure CO₂, calculated from gas chromatographic measurements yielded values that range from 23 – 59% that correspond to the extent of formed hydrates. In CH₄-rich CH₄-CO₂ mixed gas systems, CH₄ hydrates were found to form preferentially.

Keywords: methane hydrate; carbon dioxide hydrate; mixed gas hydrate; carbon sequestration; sodium dodecyl sulfate

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MDPI and ACS Style

Horvat, K.; Kerkar, P.; Jones, K.; Mahajan, D. Kinetics of the Formation and Dissociation of Gas Hydrates from CO₂-CH₄ Mixtures. Energies 2012, 5, 2248-2262.

AMA Style

Horvat K, Kerkar P, Jones K, Mahajan D. Kinetics of the Formation and Dissociation of Gas Hydrates from CO₂-CH₄ Mixtures. Energies. 2012; 5(7):2248-2262.

Chicago/Turabian Style

Horvat, Kristine; Kerkar, Prasad; Jones, Keith; Mahajan, Devinder. 2012. "Kinetics of the Formation and Dissociation of Gas Hydrates from CO₂-CH₄ Mixtures." Energies 5, no. 7: 2248-2262.

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