In chemical processing, a packed bed is a hollow tube, pipe, or other vessel that is filled with a packing material. ... factors were studied for two different types of column packings: dumped and structured (figure 1). Mainly, two different types of packing materials are available for gas absorption; Random packing (Pall ring, IMTP, Raschig rings) and Structured packing (Flexipac, Packing factor F p is a characteristic of the packing, not of the type of column or liquid.. Gas absorption, pressure drop, liquid holdup, and loading behavior in a packed column have been investigated using packing materials almost geometrically identical but fabricated from three different materials (ceramics, Saran, and polyethylene). In commercial gas treating applications, structured packing is usually preferred over random packing due to its lower pressure drop (due to higher void fraction) as well as potential for higher surface area per given volume, resulting in a better separation efficiency for the same absorber column height. These internals are the same as those covered in "Distillation". The Ergun equation can be used to predict the pressure drop along the length of a packed bed given the fluid velocity, the packing size, and the viscosity and density of the fluid. The counter-flow arrangement results in a maximum exploitation of the concentration difference between exhaust gas and scrubbing fluid which is an important motive factor for absorption. Packed Column. DOCX, PDF, TXT or read online from Scribd, 67% found this document useful, Mark this document as useful, 33% found this document not useful, Mark this document as not useful, Save Types of Packing Used in Absorption For Later, A common apparatus used in gas absorption and certain other options is the packed tower . In this case, hot gases are allowed to escape through a vessel that is packed with a refractory material until the packing is hot. Packed Column. Inside these process columns is packing. Determination of column diameter involves the analysis of pressure drop across the packed bed. Both of these factors affect packing performance. Structured packings typically consist of thin corrugated metal plates or gauzes arranged in a way that they force fluids to take complicated paths through the column, thereby creating a large surface area for contact between different phases. This brochure provides an overview of all Sulzer structured packing types … The purpose of a packed bed is typically to improve contact between two phases in a chemical or similar process. Types of Packing used in Absorption A common apparatus used in gas absorption and certain other options is the packed tower.  The chemical reaction takes place on the surface of the catalyst. Another factor in performance, in addition to the packing shape and surface area, is the liquid and vapor distribution that enters the packed bed. Packed distillation columns Packed columns are used for distillation, gas absorption and liquid-liquid extraction. The main disadvantage is the need to remove the water after. However, in certain instances where exceptionally low pressure drop and very, high flow rates are involved, stacked or oriented packings have also been, avoids high hydrostatic liquid head, and prevents the introduction of water into a dry process. 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