The separation of binaiy mixture of N_2 and CCl_4 using activated carbon is studied by the new method of density functional theoiy proposed by Kierlik and Rosinberg. We discussed the effects of pore size, pressure and temperature on selectivity of CCl_4 for the N_2/CCl_4 mixtures. The study gave references of absorbing CCl_4 from air in diffei'ent condition. The nitrogen and CCl_4 molecules are modeled as Ixnnard-Jones spherical molecules, and the well-known Steele's 10-4-3 potential are used to represent the interaction between the fluid molecule and the solid wall. In DFT method, the Helmholtz free energy is dealt by ihe scaled field particle theory. The results indicate that the pore size of 1.39 nra is the ideal size to separate CCl_4 from air with molar fraction of 1 % .

Key words: NITROGEN, CARBON TETRACHLORIDE, ADSORBENT, SELECTIVITY, PORE SIZE