Equilibrium conditions hydrate dissociation of CO2 + cyclopentene or tetrahydropyran + H2O

Abstract

The isochoric stepwise heating method was used to measure the hydrate equilibrium conditions of CO2 + cyclopentene or tetrahydropyran + H2O system. Hydrate equilibrium temperature of CO2 + cyclopentene or tetrahydropyran + H2O system is higher than that of CO2 + H2O system at any pressure. Hydrate equilibrium temperature increases with the increase of pressure. However, at higher pressure conditions, the hydrate equilibrium temperature decreases gradually with the increase of pressure, and the mixed hydrates of structure I and structure II form. The effect of cyclopentene and tetrahydropyran on the equilibrium conditions of CO2 hydrate is similar at lower temperatures, but cyclopentene has a more significant effect on the equilibrium conditions of CO2 hydrates at higher temperatures.