Raschig rings

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One-round Raschig ceramic rings

Raschig rings - a type of molding of mass exchangers, such as rectification column or absorption column, used in chemical industry installations. The name of the rings comes from the name of their inventor, the German chemist Friedrich Raschig.

Raschig rings have the shape of tubes with a height usually equal to the outer diameter. The sizes used in industry reach up to 100 mm (external diameter), wall thickness 1.5-10 mm, and the specific surface of the fill varies between 60-440 m² / m³. Depending on the application of the filling, the rings may be made of hard, abrasion-resistant and compressive ceramic, acid-resistant steel or plastics (polypropylene), chemically inert to the media flowing through the column. For laboratory purposes, Raschig rings are usually made of glass.

Raschig rings are used to increase the efficiency of column processes by developing the interface between the two contacting media (eg liquids and gas in the absorption process). The placing of the rings in the column takes place in such a way that it is flooded with water and then pours more fillings from the top of the column. No flooding of the column may lead to destruction of the filling. In industrial machines, Lessing rings are often used as lower parts of the packing, which are more mechanically resistant than Raschig rings.

Raschig rings are a relatively outdated solution, but due to their low cost often used. There are a number of fillings with a larger specific surface area and higher porosity of the filling, eg Białecki rings and Palla rings.

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