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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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4.14 Subcooled Reflux and Superheated Boilup

What happens if the reflux liquid is subcooled or the boilup vapor is superheated? We have already looked at two similar cases where we have a subcooled liquid or a superheated vapor feed. In those cases we found that a subcooled liquid would condense some vapor in the column, while a superheated vapor would vaporize some liquid. Since reflux and boilup are inputs to the column, we should expect exactly the same behavior if these streams are subcooled or superheated.

Subcooled reflux often occurs if the condenser is at ground level. Then a pump is required to return the reflux to the top of the column. A saturated liquid will cause cavitation and destroy the pump; thus, the liquid must be subcooled ...

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