Henry’s law constants and equilibrium isotherms were determined for four C8 aromatic hydrocarbons (o, m and p-xylene, ethylbenzene) in NaY, NaX and KY zeolite crystals. The diffusivity of all 3 xylenes was about 5 x 10-7cm2/s in NaX at 400C.

Sorption and Diffusion of C8 Aromatic Hydrocarbons in Faujasite Type Zeolites. I. Equilibrium Isotherms and Separation Factors. D.M.Ruthven, M.Goddard: Zeolites, 6[4], 275–82