Raschig rings are referred to as random packing and are used in commercial fractional distillation columns to reduce pressure loss (versus using trays), while maintaining good efficiency and economy. Typically the change in pressure (also called "delta p") is lower than in the case of trays but slightly higher than for structured packing.
What are they[]
Raschig rings are small tube cuttings providing a surface for (re)evaporation of the most volatile part in the refluxing [1] distillate, typically 10 mm in diameter and 12 mm long.
It is manufactured from PP material with injection method. Uses water cooling towers and scrubbers.
It is used as cooling fill in cooling towers. In Scrubber facilities , it raises the contact surface of gas with liquid devoted to purify. It removes smell by washing and condensing the gas, provides purification from hazardous waste.
Made from[]
These can be made from metal, glass, or can be ceramic.
Different types[]
There are many other forms and shapes a random packing may assume. Raschig is a German company that invented the Raschig Ring. They are also offering numerous variants.
Superiority[]
Raschig rings made of copper tube cuttings are superior at fractionating volatile hydrocarbons (or ethanol) mixed with water.
Technical advancement[]
Due to recent advancements in structured packing the technical window where application of random packing is optimum is reduced significantly. Use typically limited to columns of very small diameter where structured packing is more difficult to fit in and the disadvantages of a lower efficiency and hence taller column have less economic impact.
See also[]
External links[]
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