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

Abstract

Session: International Conference on Integrated Petroleum Engineering (IPE)International audienceThis 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