Separation of apricot kernel from shells is important processes to use the kernel and shells. In this study, some physical properties were studied for apricot kernel and shells. pneumatic separator was used and separation module performance was investigated as a function of change in air stream velocity of 9, 10, 11and 12 m/s, feeding rate of 30, 60, 90 and 120 kg/h, mixture moisture contents of 5.76, 14.46 and 21.67% w. b. and screen slope of 25 and 35o. The results revealed that, optimum operations conditions were obtained at 11 m/s air velocity, feeding rate of 120 kg/h, mixture moisture content of 14.46 % and screen slope of 25o, the separation effectiveness of 96.18 %, kernel cleanliness of 93.83 %, kernel losses of 0.69 %, kernel productivity of 40 kg/h, specific energy of 4.22 kW.h / Mg and cost of 96 L.E./Mg.