The effect of evacuation and rinse step on the process performance was studied using numerical simulation to recover heavy component in a PSA process. Rinse and evacuation steps are very important to obtain heavy component as a product. Therefore, to improve the process performance, the rinse pressure, reflux ratio and flow direction of rinse step were selected as variables, and the performance change of process according to changing variables was investigated. The effect of evacuation condition combined with the rinse condition was studied also. As a result, the optimum operating condition was obtained to have maximum process performance. Increasing rinse pressure conduced to increase the recovery by increasing adsorbed amount of CO2 during the rinse step. Decreasing evacuation pressure contributed to increase the purity by increasing adsorbed amount of CO2 during the evacuation step. At this point, the optimum reflux ratio was existed at certain pressure conditions.