Process Equipment and Plant Design
Bubble cap plate column is

A differential stage contactor
Used only for distillation, not for absorption
A continuous contactor
A finite stage contactor

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Is economical in operation
Both B & C
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Employs high velocity, high heat transfer rate and less heating surface requirement

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