Effect of n-tetradecane with or without n-heptadecane on equilibrium dissociation conditions of carbon dioxide hydrate

The isochoric stepwise heating method is used to study the effect of liquid hydrocarbon n -tetradecane and n -tetradecane/ n -heptadecane on the equilibrium dissociation conditions of carbon dioxide hydrate. The addition of n -tetradecane or n -tetradecane/ n -heptadecane reduces carbon dioxide hydrate phase equilibrium pressures . As the temperature increases, the promotion effect of the liquid hydrocarbons is more obvious. The promotion effect of n -tetradecane is stronger than that of the mixture of n -tetradecane and n -heptadecane at higher temperature. The quadruple point of carbon dioxide hydrate with the mixture of n -tetradecane and n -heptadecane ( w  = 0.3363) is almost the same as that of carbon dioxide hydrate in pure water.