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American Mineralogist; August 2004; v. 89; no. 8-9; p. 1183-1191
© 2004 Mineralogical Society of America
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The stability of methane hydrates in highly concentrated electrolyte solutions by differential scanning calorimetry and theoretical computation

Didier Dalmazzone1,*, Daniele Clausse2, Christine Dalmazzone3 and Benjamin Herzhaft3

1 Laboratoire de Chimie et Procédés, Ecole Nationale Supérieure de Techniques Avancées, 32, boulevard Victor, 75739 Paris cedex 15, France
2 Département de Génie Chimique, Université de Technologie de Compiègne, BP 529 60205 Compiègne cedex, France
3 Institut Français du Pétrole, 1-4 avenue de Bois Préau, 92852 Rueil Malmaison, France

Correspondence: * E-mail: dalmazzo{at}ensta.fr

The stability limits of methane hydrates have been investigated at pressures from 5 to 12 MPa by high-pressure differential scanning calorimetry, in sodium chloride and calcium chloride solutions, at concentrations ranging from pure water to saturated salt, in continuous solutions, in water-in-oil emulsions, as well as in complex dispersed media used as drilling fluids. Experimental results are in good agreement with available data, and concord well with predictions computed using the model of Van der Waals and Platteeuw (1959). DSC experiments revealed eutectic melting of solid mixtures of gas hydrate and crystallized salt. Corresponding invariant temperatures of melting and phase compositions were computed for various gas pressures. Complete phase diagrams are proposed for the systems (methane + water + sodium chloride) and (methane + water + calcium chloride) at 2 MPa and 10 MPa methane pressure.




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Z. Duan and R. Sun
A model to predict phase equilibrium of CH4 and CO2 clathrate hydrate in aqueous electrolyte solutions
American Mineralogist, August 1, 2006; 91(8-9): 1346 - 1354.
[Abstract] [Full Text] [PDF]


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