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International Conference on Gas Hydrates (ICGH) (6th : 2008)

STUDY OF THE KINETICS OF FORMATION OF TRICHLOROFLUORO-METHANE HYDRATES AND METHANE HYDRATES IN WATER-IN-OIL EMULSION BY MICROCALORIMETRY Dalmazzone, Didier; Hamed, Néjib; Clausse, Danièle; Pezron, Isabelle; Luong, Anh-Tuan

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.

Item Metadata

Title
STUDY OF THE KINETICS OF FORMATION OF TRICHLOROFLUORO-METHANE HYDRATES AND METHANE HYDRATES IN WATER-IN-OIL EMULSION BY MICROCALORIMETRY
Creator
Dalmazzone, Didier; Hamed, Néjib; Clausse, Danièle; Pezron, Isabelle; Luong, Anh-Tuan
Contributor
University of British Columbia. Department of Chemical and Biological Engineering; International Conference on Gas Hydrates (6th : 2008 : Vancouver, B.C.)
Date Issued
2008-07
Description
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.
Extent
522120 bytes
Subject
Gas hydrates; Kinetics; Emulsion; Drilling fluid; DSC
Genre
Conference Paper
Type
Text
File Format
application/pdf
Language
eng
Date Available
2008-07-30
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0041039
URI
http://hdl.handle.net/2429/1194
Affiliation
Non UBC
Citation
Dalmazzone, Didier; Hamed, Néjib; Clausse, Danièle; Pezron, Isabelle; Luong, Anh-Tuan. 2008. STUDY OF THE KINETICS OF FORMATION OF TRICHLOROFLUORO-METHANE HYDRATES AND METHANE HYDRATES IN WATER-IN-OIL EMULSION BY MICROCALORIMETRY. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
Peer Review Status
Unreviewed
Copyright Holder
Dalmazzone, Didier
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribution-NonCommercial-NoDerivatives 4.0 International