Question: 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

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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