Dissociation pressures and compositions of quinol clathrates of methane and methyl fluoride

Equilibrium pressures corresponding to the invariant point, clathrate-α-quinol-gaseous guest, and the corresponding clathrate compositions have been measured for methane-quinol in the range 10-25°, and for methyl fluoride-quinol in the range 25-50°. For both guests the fraction of cavities occupied at the invariant point is larger than the value previously observed for small guest molecules, suggesting that the lattice of β-quinol is distorted by the CH₄ and CH₃F molecules. Enthalpies and entropies of clathration have been calculated. Comparison with theory is possible for the methane clathrate and is reasonably good when either the Lennard-Jones or the Pöschl-Teller potential function is used for the interaction between the guest molecule and the atoms in the wall of the cage.