For a batch rectifier with appreciable column holdup: (a) Why is the charge to the still-pot higher

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For a batch rectifier with appreciable column holdup: 

(a) Why is the charge to the still-pot higher in the light component than at the start of rectification, assuming that total-reflux conditions are established before rectification? 

(b) Why will separation be more difficult than with zero holdup?

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Separation Process Principles Chemical And Biochemical Principles

ISBN: 9780470481837

3rd Edition

Authors: By J. D. Seader, Ernest J. Henley, D. Keith Roper

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