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Packed Column Internals . Packed Column. Factors Favoring P acked C olumns. Vacuum systems: Low pressure drop Small diameter column Corrosive system Foaming Lower liquid hold-up Batch distillation. Objectives of Packing D esign.

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factors favoring p acked c olumns
Factors Favoring Packed Columns
  • Vacuum systems: Low pressure drop
  • Small diameter column
  • Corrosive system
  • Foaming
  • Lower liquid hold-up
  • Batch distillation
objectives of packing d esign
Objectives of Packing Design
  • To attain maximum mass transfer and capacity with minimum pressure drop by improving
    • Aerodynamic properties
    • Liquid distribution
    • Gas/liquid contact
properties of packing
Properties of Packing
  • High surface area per volume
  • Hood wettabilityand good resistance to the pressure (high strength).
  • Pressure drop should be desirably low. When the size increases, both mass transfer and pressure drop decrease. The optimal size and shape is the one which compromise both factors.
m aterials

Nowadays metal and plastic packing have replaced the ceramic

  • Ceramic elements are still used when corrosive chemicals are involved and good wettability is required
  • Metal elements provide good wettability with the advantage of having higher strength
  • Plastic, usually polypropylene, is largely used because of low cost but they fail in case of high temperature. Besides they have poor wettabiity.
packing types
Packing Types
  • Random or dumped packing
  • Structured packing: layers of wire mesh/corrugated sheets
  • Grids: open lattice structure