Packed column internals
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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
Materials

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




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