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Résumé :
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An automated Tian-Calvet heat-flow calorimeter was used to determine compositions, enthalpies of dissociation, and heat capacities in the range 85 to 270K of gas hydrates. Measurements were made on laboratory-synthesized hydrates of xenon, krypton, methane, ethane, propane, and isobutane and on two samples of naturally occuring gas hydrates. The compositions and enthalpies of dissociation of the synthetic hydrates were found to be in general agreement with the corresponding values derived from the phase-equilibrium temperature-pressure results reported in the litterature ; the accuracy of the calorimetric measurements was generally better. The therml properties of the naturally occuring gas hydrates were found to be similar to those of the synthetic hydrates.
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