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  • 1 Université de Technologie de Compiègne Département de Génie des Procédés Industriels 60205 Compiègne France
  • 2 Université Paris XI Laboratoire Physico-Chimie des Systèmes Polyphasés Châtenay-Malabry France
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Abstract  

Trichlorofluoromethane (CCl3F) and water form clathrate hydrate which melts at 8.5 °C under atmospheric pressure. By DSC and X rays analysis we could distinguish between hydrate and ice formed in emulsion containing NaCl and show that quantity of hydrate formed and its dissociation temperature are dependent on solution concentration. The equilibrium curve hydrate-NaCl solution is displaced towards higher temperatures with respect to corresponding ice curve. Consequently solid–liquid equilibrium can not be established in presence of both solids. Growth of hydrate crystals at the expense of ice was evidenced. Role of salt in hydrate growth and ice melting is examined.

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