Mass Transfer
Inside the distillation columns, the

Highest temperatures is near the feed plate
Vapors are not always at their dew points
Driving force for the liquid flow is its weight
All of these

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Decreases pressure drop, decreases surface area
Increases pressure drop, increases surface area
Decreases pressure drop, increases surface area
Increases pressure drop, decreases surface area

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