Study of the kinetics of formation of trichlorofluoromethane hydrates and methane hydrates in water-in-oil emulsions by microcalorimetry

Abstract : Differential scanning calorimetry has been used to study the kinetics of formation of clathrate hydrates in the systems water-CCl3F and water-CH4, in which the water phase was dispersed in an oil phase in the form of an emulsion. CCl3F hydrates were formed at ambient pressure and constant temperatures of -10, -15 and -20 °C. The results showed that the crystallization of both ice and hydrate are in competition at the lowest temperature, whereas only hydrate is formed at -10 or -15 °C. CH4 hydrates were studied using a high-pressure DSC in the range 10 to 40 MPa, at various temperatures. At high driving force, the heat peak related to the formation of hydrates has a regular and symmetric shape, and its height and width depend on the gas pressure and sub cooling degree. At near equilibrium conditions, hydrate formation can be delayed by several hours, but is still clearly observable. A model based on crystal growth theory coupled with a statistical law to take into account the germination in micro sized droplets is proposed.
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Contributor : Didier Dalmazzone <>
Submitted on : Thursday, July 23, 2015 - 3:17:13 PM
Last modification on : Tuesday, July 23, 2019 - 8:22:02 PM

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Didier Dalmazzone, Néjib Hamed, Danièle Clausse, Isabelle Pezron, Anh-Tuan Luong. Study of the kinetics of formation of trichlorofluoromethane hydrates and methane hydrates in water-in-oil emulsions by microcalorimetry . 6th International Conference on Gas Hydrates (ICGH 2008), Jul 2008, Vancouver, Canada. pp.10. ⟨hal-01179910⟩

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