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

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

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Mass Transfer
Flash distillation is

Same as differential distillation
Same as simple distillation
Most useful for handling binary systems
Used for multicomponent systems like crude refining

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