Due to the opening of the ring wall of the Pall ring, the utilization rate of the space in the ring and the inner surface of the ring is improved, the air flow resistance is small, and the liquid distribution is even. It has the advantages of large flux, low resistance, high separation efficiency and large operating flexibility. The processing capacity under the same pressure reduction can be more than 50% larger than that of the Raschig ring. This kind of packing has the characteristics of large production capacity, strong resistance, and large operating flexibility. Under normal circumstances, the pressure drop can be processed by 50%-100% larger than the Raschig ring under the same pressure drop, and the pressure drop is 50% lower than the Raschig ring under the same processing- 70%, the gas flux of the Pall ring can be increased by more than 50%, and the efficiency of the mass transfer equipment can be increased by about 30%. Pall ring is a widely used packing.