Question: For a batch rectifier with appreciable column holdup: (a) Why is the composition of the charge to the still higher in the light component than

For a batch rectifier with appreciable column holdup:
(a) Why is the composition of the charge to the still higher in the light component than the still composition at the start of rectification, assuming that total-reflux conditions are established before rectification begins?
(b) Why will separation be more difficult than with zero holdup?

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