Ag+ ion impregnated clay as a newly developed adsorbent was studied for 1-butene separation from n-butane. Equilibrium adsorption isotherms of pure components were measured at the temperature range from 25degreesC to 100degreesC and pressure lip to 1200 mmHg. Experimental data of n-butane and 1-butene were correlated with various isotherm models. The best selectivity was shown at 80degreesC. Equilibrium capacities for I-butene and n-butane at 80degreesC and 900 mmHg were 0.92 and 0.31 mmol/g, respectively. The average heats of adsorption for n-butane and 1-butene were found to be 6.6 and 13.3 kcal/mol, respectively. Diffusion of 1-butene and n-butane on this sorbent was fast, with 100% uptake reached within 15 min. The IAS model with Toth isotherm for pure component gave the best prediction results for both the n-butane and I-butene compared to the other models used in the study. Binary adsorption equilibrium was well predicted by the Ideal Adsorbed Solution (IAS) model. The equilibrium adsorption ratio of 1-butene/n-butane in binary system was 14.87 and its selectivity was 6.71 at 80degreesC and 900 mmHg, when the mole fraction of 1-butene in gas phase was 0.689. Experimental breakthrough curves were well predicted by a mathematical model, and the curves were steep enough to separate 1-butene from n-butane. Thus, it can be noted that Ag+ ion impregnated clay can be applied to the adsorptive separation Of C-4 olefin/paraffin.