The PTFE pall ring has the advantages of large flux, small constraint, high separation efficiency and large operation flexibility. Under the same pressure reduction, the treatment volume can be more than 50% larger than the Raschig ring. When the same amount of treatment is used, the pressure drop can be compared with the Raschig ring. The filler has the characteristics of large production capacity, strong resistance, and high operational flexibility. Under normal circumstances, the same pressure drop can be reduced by half. Mass transfer efficiency can be increased by about 20%. %-100%, the same pressure drop is 50%-70% smaller than the Lacy ring, the tower height also has a pressure drop, and the Pall ring can be filled with a volume of about 20%-40% than the Raschig ring.