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Packed: Derivations

Packed columns have several relative advantages over plate columns including better mass transfer and ability to handle toxic or flammable liquids. The optimum size and shape of packing materials balances mass transfer and pressure drop. Height Equivalent to a Theoretical Plate (HETP) and Number of Transfer Units (NTU) describe packed column efficiency, and their relationship depends on operating and equilibrium conditions. HETP and Height of a Transfer Unit (HOG) are equal if operating and equilibrium lines are straight and parallel. HETP method can be used to calculate packed column height for distillation by determining HETP and number of plates from feed and product conditions.

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Joy Prokash Roy
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58 views5 pages

Packed: Derivations

Packed columns have several relative advantages over plate columns including better mass transfer and ability to handle toxic or flammable liquids. The optimum size and shape of packing materials balances mass transfer and pressure drop. Height Equivalent to a Theoretical Plate (HETP) and Number of Transfer Units (NTU) describe packed column efficiency, and their relationship depends on operating and equilibrium conditions. HETP and Height of a Transfer Unit (HOG) are equal if operating and equilibrium lines are straight and parallel. HETP method can be used to calculate packed column height for distillation by determining HETP and number of plates from feed and product conditions.

Uploaded by

Joy Prokash Roy
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Packed

Short Notes from slide

 What are the relative advantages of packed columns over plate columns? (10)
 The optimum size and shape of packing materials is a compromise between the
mass transfer and pressure drop"- Explain. (10)
 'Packed column is preferred over tray column for toxic or flammable liquids' - why? (7)

----ask those who were attentive during the class

Derivations

Wankat 19.1—19.3

 What are HETP and NTU? Derive the relationship between HETP and NTU for two
different conditions of operating and equilibrium lines. (Wankat 19.3)

 Show that the HETP and HOG of a packed column are same if the if the operating line
and equilibrium line for the system are strarght and parallel. (15)

 What is HETP? Write down the steps to calculate packed column height using HETP
method for distillation. (10)
Problems
Follow Akib Sir’s Chotha

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