determination of equilibrium parameters and effective pore diffusion coefficient of light and liquid n-paraffins on sa molecular sieves.

the molecular sieves are selective adsorbents. they can adsorb some kind of molecules that are different in size or shape from the others. in separation of n-paraffins from iso-paraffins and aromatics, sa molecular sieve is the suitable adsorbent, and can adsorb n-paraffins to separate them from other hydrocarbons. in this paper equilibrium isotherms of n-cs, n-c6 and n-c7 from an inert solvent, benzen (non adsorbed), on sa molecular sieves, was determined, for single component adsorption. the experimental data was conducted on the langmuir isotherm and the parameters of this model were determined. on the other hand , the kinetics of adsorption of n-c6 and n-c7 have been determined in the finite bath experiments; and the concentration profile of each component versus time was determined. the batch adsorption model based on pore diffusion model had been written and calculated numerically. there were film and pore diffusion resistances against the n-parrfin adsorption, and also there was local equilibrium between the pore fluid and the solid phase. the equilibrium model was based on the langmuir isotherm. by super position of batch adsorption model onto finite bath experiments, the tortousity factor of adsorbent structure and the film mass transfer were estimated. by determination of tortousity factor , the pore diffusion coefficient of each component was calculated. this procedure is a general method to determine the effective pore diffusion coefficient of any component into the adsorbents.