Pall ring packing has the advantages of large flux, low resistance, high separation efficiency and large operating flexibility. Under the same pressure reduction, the processing capacity can be more than 50% larger than that of the Raschig ring. At the same throughput, the pressure drop can be reduced by half, and the mass transfer efficiency can be increased by about 20%. Compared with the Raschig ring, this packing has the characteristics of large production capacity, low resistance, and greater operating flexibility. Under normal circumstances, the same pressure drop can be processed by 50%-100% larger than the Raschig ring. The west ring is 50%-70% smaller, and the tower height is also reduced in pressure. The Pall ring can be about 20%-40% of the packing volume than the Raxi ring.