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Mass Transfer

Q1: An ideal tower packing should not

A have low weight per unit volume.

B have large surface area per unit volume.

C have large free cross-section.

D hold up large amount of liquid in the packing.

ANS:D - hold up large amount of liquid in the packing.

An ideal tower packing should not hold up a large amount of liquid in the packing. Here's why:

  1. Efficient Mass Transfer: Tower packing is used in distillation and absorption columns to increase the contact surface area between the liquid and vapor phases, facilitating mass transfer. If a packing material holds a large amount of liquid, it can impede the flow of vapor and liquid through the column, reducing the efficiency of mass transfer.
  2. Minimized Liquid Holdup: Ideally, tower packing should allow for efficient drainage of liquid to prevent excessive liquid holdup within the packing material. Excessive liquid holdup can lead to flooding and decreased column efficiency.
  3. Enhanced Contact between Phases: Tower packing with a design that minimizes liquid holdup ensures that there is more contact between the liquid and vapor phases, promoting efficient mass transfer and separation of components in the column.
Therefore, an ideal tower packing should have characteristics that promote efficient mass transfer, including a large surface area per unit volume and a large free cross-section, while minimizing liquid holdup to maximize column performance.



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