... ,absorption ,deadsorption ,common decompression and so on ... Pall ring : Its structure improve distribution of gas-liquid and its ... drop compared with Rasi ring.Features; Pall ring has some advantages such as lower pressure drop ,big flux ,high effeciency , ... separation and desulfurization System etc.Parameters of PP Pall Ring Model Specification Number per volumeSpecific areaVoid VolumeDry packing ...