BATCH ADSORPTION OF TRICHLOROTRIFLUOROETHANE (FREON-113) ONTO ACTIVATED CARBON SURFACE DIFFUSIVITY AND PORE DIFFUSIVITY

Activated carbon was found more active than molecular sieve 13X and silica gel in adsorbing 1,1,2 trichloro-1,2,2 trifluoroethane (CFE). Batch adsorption experiments were carried out with activated carbon to adsorb CFE at 15, 25 and 30-degrees-C. The adsorption isotherms of CFE on activated carbon were of the Langmuir type: q(C) = q(m)KC/(1 + KC) where q(m) and K were evaluated for the three temperatures. The measured bulk concentration-time data were interpreted equally well with the surface diffusion model and the pore diffusion model; for the former model the surface diffusivity increased with increasing initial CFE concentration, and for the latter and pore diffusivity was independent upon the initial CFE concentration.