In chemical processing, a packed bed is a hollow tube, pipe, or other vessel that is filled with a packing material. The packing can be randomly filled with small objects like Raschig rings or else it can be a specifically designed structured packing. Packed beds may also contain catalyst particles or adsorbents such as zeolite pellets, granular activated carbon, etc.
The purpose of a packed bed is typically to improve contact between two phases in a chemical or similar process. Packed beds can be used in a chemical reactor, a distillation process, or a scrubber, but packed beds have also been used to store heat in chemical plants. In this case, hot gases are allowed to escape through a vessel that is packed with a refractory material until the packing is hot. Air or other cool gas is then fed back to the plant through the hot bed, thereby pre-heating the air or gas feed.
Read more about Packed Bed: Theory
Famous quotes containing the words packed and/or bed:
“For Cambridge people rarely smile,
Being urban, squat, and packed with guile.”
—Rupert Brooke (1887–1915)
“If the Soviet Union can give up the Brezhnev Doctrine for the Sinatra Doctrine, the United States can give up the James Monroe Doctrine for the Marilyn Monroe Doctrine: Let’s all go to bed wearing the perfume we like best.”
—Carlos Fuentes (b. 1928)