Abstract
Methane, ethane and propane, the main components of LNG, have the property like ideal gas, but they deviate from ideal solution in multicomponent system by the effect of composition.
Though it is essential to have correct equilibrium ratio to analyze the concentration process of LNG, we cannot find any adequate equations which estimate correctly the vapour-liquid equilibrium of the multicomponent system.
We have obtained K values of the ternary system of methane, ethane and propane by observation, and studied the cases when a small quantity of butane is mixed in the system. Based on these data we analyzed the concentration process of LNG by calculating the equilibrium flash vaporization.
