The possibility and extent of the separation of impurity vanadium in titanium tetrachloride by means of adsorption with molecular sieves were studied. As ascertained by the experimental results, the adsorption of VOCl3 onto molecular sieve internal surface was controlled by the intraparticle diffusion of the molecules. Although all of the three kinds of molecular sieves used are competent for removing vanadium from titanium tetrachloride, type 4 A behaves more effectively than the others under the same conditions. After adsorption for nine stages, the concentration of vanadium in the product becomes as less as that of industrial standard level.