The pall ring has been significantly improved upon the Raschig ring. Although the outer diameter of the ring is also equal to its height, two rows of windows with inwardly extending tongue-like pieces are cut on the ring wall. Each layer of window holes has 5 tongue-like pieces. This structure improves the gas-liquid distribution, makes full use of the inner surface of the ring, and enhances the efficiency of gas-liquid distribution and transmission. It is generally made of metal, plastic or ceramic. Molecular sieves can adsorb molecules smaller than their pore diameters into the pore channels and repel large molecules outside the channels, thereby playing a role in screening molecules. Of course, molecular sieves not only have the function of screening but also have a certain role in improving the reaction ability, that is, they act as a "medium" in chemical reactions to promote the progress of chemical reactions.

• Plastic Pall Ring

• Metal Pall Ring

• Ceramic Pall Ring