What is tower packing?

What is tower packing?

Tower packing should enable the gas and liquid contact surface , mass transfer coefficient, while flux and resistance, so they requested that the filler layer , high porosity, specific surface area, surface wetting properties, and also help in the structure two-phase close contact , to promote turbulence . Materials of the treated material but also a corrosion resistance , and has a certain mechanical strength , the filler and the bottom layer will not be broken due to pressure , deformation.

Feature
Tower packing is liquid two- phase contact member as mass transfer devices. The tower is a tower packing has vertical cylinder , the bottom with packing support plate , fillers heaps or placed in the way of the whole puzzle supporting plate . Installed above the filler filler plate to avoid being blown updraft . The liquid from the top to the liquid distributor spray filler and the filler surface flow along .

Gas is fed from the bottom , the gas distribution means ( small diameter column generally not gas distribution means ) distribution , the countercurrent to the liquid to pass through the gap fill layer , the surface of the filler , be in close contact with the gas-liquid two-phase mass transfer . Tower packing is continuous contact mass transfer equipment, two -phase composition changes continuously along the column.

When the liquid flows down along the filler layer, a gradual trend to concentrate the column wall , such that fluid flow near the column wall increases, a phenomenon known as wall flow . Wall-flow gas-liquid two -phase effect caused by the uneven distribution of the filler layer , so that the mass transfer efficiency. Therefore, when the packing layer is high , the need for segmentation, the middle setting redistribution devices. Liquid distribution means further includes a liquid collector and liquid redistribution of two parts , the upper flow of the filler through the liquid collector to collect the liquid and fed to the liquid redistributor , after the re- distributed to the lower spray filler .

Tower packing has a large capacity , high separation efficiency , low pressure drop , liquid holdup small , operating flexibility and other advantages.
Tower packing also has some shortcomings , such as high cost filler ; when the liquid load is small not effective wetting of the filler surface, so mass efficiency ; not directly applicable to a suspension or easily polymerizable material ; the lateral wire feeding and the material is not suitable for such complex distillation and so on.

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