EXCESS ADSORPTION-ISOTHERMS OF N-HEXANE PLUS N-HEXADECANE AND N-HEXANE PLUS ETHANOL ONTO POROUS SOLIDS AND THEIR ANALYSIS

The adsorption isotherms of the binary mixtures of n-hexane + n-hexade cane and n-hexane + ethanol onto the zeolite NaZSM-5, the activated ca rbon AS, the silicagel DK3, and two molecular sieves of carbon, were m easured at 283 K, 298 K and 313 K. The specific free wetting enthalpy, Phi(2) - Phi(1), was calculated for the explanation of the physico-c hemical background of the n-hexane + n-hexadecane adsorption. Furtherm ore, the wetting enthalpy, Delta H - Delta H-1, and wetting entropy, Delta S - Delta S-1, at average temperature were calculated on the ba sis of the temperature dependence. The activity coefficients for the b ulk phase were calculated with the UNIFAC method. Adsorption equilibri um diagrams were calculated for several systems and compared with the vapour-liquid equilibrium diagrams. Several influencing factors on ads orption isotherms were discussed.