Why Raschig Rings used as Degasser Tower Media?

 Raschig rings are a type of random packing material used in various applications, including degasser towers. Degasser towers are typically used to remove dissolved gases, such as oxygen and carbon dioxide, from a liquid stream, usually water. The Raschig rings provide a large surface area for efficient mass transfer between the liquid and gas phases, promoting the removal of gases from the liquid.

When Raschig rings are used in a degasser tower, they are packed in the tower column. The rings are typically made of ceramic, metal, or plastic materials and have a cylindrical shape with a diameter equal to their height. The packing arrangement creates a tortuous path for the liquid and gas to flow through, maximizing the contact between the two phases.

As the liquid flows downward through the tower, the dissolved gases come into contact with the large surface area provided by the Raschig rings. This contact facilitates the transfer of the gases from the liquid phase to the gas phase. The gases then exit the tower through an outlet at the top, while the degassed liquid continues its downward flow.

The specific design and configuration of the degasser tower, including the size and quantity of Raschig rings used, depend on factors such as the desired level of degassing, flow rates, and the characteristics of the liquid being treated. Engineering considerations, such as pressure drop, liquid distribution, and tower height, also play a role in optimizing the degassing process.

It's important to note that while Raschig rings are commonly used in degasser towers, there are other types of packing materials available, such as structured packing, that can also be used based on the specific requirements of the application.


Raschig rings offer several advantages in degasser towers compared to other packing media. Here are some of the advantages:

  1. High Surface Area: Raschig rings provide a large surface area for mass transfer between the liquid and gas phases. The cylindrical shape of the rings allows for efficient contact between the two phases, promoting the removal of dissolved gases from the liquid.

  2. Versatility: Raschig rings are available in a variety of materials, including ceramic, metal, and plastic. This versatility allows for the selection of a material that is compatible with the specific application and the properties of the liquid being treated. For example, ceramic Raschig rings are often used in corrosive environments.

  3. Resistance to Fouling: Raschig rings are designed with an open structure that resists fouling. The void space between the rings allows for easy passage of the liquid, reducing the chances of clogging or blockage due to particulate matter or precipitates.

  4. Low Pressure Drop: The open structure of Raschig rings also results in a relatively low pressure drop across the packing bed. This characteristic is important for minimizing energy consumption and ensuring efficient operation of the degasser tower.

  5. Cost-Effectiveness: Raschig rings are widely available and cost-effective compared to some other packing media. Their relatively simple design and manufacturing process contribute to their affordability.

  6. Durability: Depending on the material chosen, Raschig rings can exhibit high mechanical strength and resistance to temperature and chemical corrosion. This durability ensures a long service life and reduces the need for frequent replacement.

It's worth mentioning that the choice of packing media depends on the specific requirements of the degasser tower and the characteristics of the liquid being treated. Other types of packing media, such as structured packing or random dump packing, may also offer advantages in certain applications. Therefore, it's essential to consider the specific conditions and goals of the degasser tower when selecting the appropriate packing media

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