Behavior of cyclopentane hydrates formation and dissociation in pure water and in the presence of sodium chloride

Son Ho-Van (1, 2, 3, 4) , Jérome Douzet (1, 2, 3) , Duyen Le-Quang (4) , Baptiste Bouillot (1, 2, 3) , Jean-Michel Herri (1, 2, 3)

1 LGF-ENSMSE - Laboratoire Georges Friedel
2 PROPICE-ENSMSE - Département PROcédés Poudres, Interfaces, Cristallisation et Ecoulements
3 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
4 HUMG - Hanoi University of Mining and Geology

This paper reports the temperature and conductivity behaviors of the cyclopentane hydrate formation and dissociation with and without sodium chloride. The experiments were all performed in a jacketed vessel connected to a chiller having the operating temperature down to -20 °C. The equilibrium temperatures of cyclopentane hydrate were determined in the presence of sodium chloride solution with concentration from 0% to 26% in mass fraction (the saturated concentration of NaCl at 20 oC) according to an environmental dissociation method. The results showed that the temperature of mixture inside the vessel increased when cyclopentane hydrates formed due to the exothermic nature property of the crystallization. The slope of the temperature curve decreased when cyclopentane hydrates dissociated intensely resulting from its endothermic characteristic. The conductivity of mixture had illogical tendencies owing to the appearance of air bubbles and hydrate solid phase during crystallization and dissociation. The results also showed that the equilibrium temperatures of cyclopentane hydrate range from 7.7 °C down to -13.2 °C, and are inversely proportional to the salt concentration.

Mots clés: Cyclopentane hydrate; Equilibrium temperature; Sodium chloride.

Domaines: Génie des procédés

Son Ho-Van, Jérome Douzet, Duyen Le-Quang, Baptiste Bouillot, Jean-Michel Herri. Behavior of cyclopentane hydrates formation and dissociation in pure water and in the presence of sodium chloride. INTERNATIONAL CONFERENCES ON EARTH SCIENCES AND SUSTAINABLE GEO-RESOURCES DEVELOPMENT -ESASGD 2016-, Hanoi University of Mining and Geology, Nov 2016, Hanoï, Vietnam. pp.150 à 157. ⟨hal-01466636⟩