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  • Presentation posted in: General Absorption Anam Saeed. Absorption. Unit operation and is mass transfer phenomena where the solute of a gas are removed by being placed in contact with a nonvolatile liquid solvent that removes the components from the gas. Solvent:

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AbsorptionAnam Saeed

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Unit operation and is mass transfer phenomena where the solute of a gas are removed by being placed in contact with a nonvolatile liquid solvent that removes the components from the gas.


Liquid applied to remove the solute from a gas stream.


Components to be removed from an entering stream.

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Purpose :The purpose of such gas scrubbing operations may be any of the following;For Separation of component having the economic value.As a stage in the preparation of some compound.For removing of undesired component (pollution).Types of absorption:Physical absorption Chemical Absorption

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Physical Absorption:In physical absorption mass transfer take place purely by diffusion and Physical absorption occurs when the absorbed compound dissolves in the solvent. These properties are temperature dependent, and lower temperatures generally favor absorption of gases by the solvent.Chemical Absorption:Chemical absorption occurs when the absorbed compound and the solvent react.

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Types of absorber:Packed column Plate column1. Packed column:Packed towers are columns filled with packing materials that provide a large surface area to facilitate contact between the liquid and gas. Packed tower absorbers can achieve higher removal efficiencies.2.Plate column:Plate, or tray, towers are vertical cylinders in which the liquid and gas are contacted in stepwise fashion on trays (plates). Liquid enters at the top of the column and flows across each plate and through a downspout (down comer) to the plates below. Gas moves upwards through openings in the plates, bubbles into the liquid, and passes to the plate above.

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Packed column:

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Packed Tower Internals:1.Tower shell: 2.Mist eliminator:

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3. Packing:4. distributors:

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5.Redistributors:6.Support plates:

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Types of packing:

  • random dumped packing

  • structured packing

    Packing material can be used instead of trays to improve separation in distillation columns. Packing offers the advantage of a lower pressure drop across the column

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Rashing Rings:

Carbon rings metal rings ceramic rings

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Pall rings:

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Intalox saddle:

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Contact between a liquid and gas:

Channeling often occurs in a packed tower.  This phenomenon takes place when the fluid moving down the column moves towards the region of greatest void space; this occurs at the region near the wall where the packing is not tightly packed.  Thus, liquid redistributors are used to redirect the fluid flow towards the column center.


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Packing Characteristics:

           Packing materials must have the following characteristics: a large wetted surface area per unit volume of packed space (this allows a large interfacial area to exist), a large void volume (needed for low pressure drops), good wetting characteristics, corrosion resistance, low bulk density, and low cost.  No one type of packing will possess all these characteristics

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Pressure drop and limiting flow rates:

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Thank you

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