ADSORPTION EQUILIBRIA OF HALOCARBON VAPORS ON ACTIVATED CARBONS

Adsorption equilibria of four halocarbons, dichlorodifluoromethane (CCl2F2, CFC-12), chlorodifluoromethane (CHClF2, HCFC-22), 1, 2-dichloro-1, 1, 2, 2-tetrafluoroethane (CClF2CClF2, CFC-114), and bromotrifluoromethane (CBrF3, halon-1301), on five activated carbons were measured at 316K by the gravimetric method. The data obtained were correlated by use of the Dubinin-Astakhov equation (W = W0 exp {-(A/E)n}) with the parameters of the adsorbents. The exponent n ranged from 1.2 to 2.5, depending on the adsorbate-adsorbent system, though the limiting volumes of micropore adsorption space W0 of the adsorbent did not depend on the adsorbate. The characteristic energy of adsorption E and the exponent n were correlated by the molecular diameter d of the adsorbate.