Question: A continuous rectifying column is separating binary mixture containing A & B (in which A is more volatile than B) into an overhead product containing

A continuous rectifying column is separating binary mixture containing A & B (in which A is more volatile than B) into an overhead product containing 95 mol% A. The liquid overflowing from adjacent plate in the enrichment section contains 58.6 mol% and 50 mol% of A respectively. The plate efficiency is 100% and reflux is at its bubble point. Relative volatility may be taken as 2.5. Calculate the reflux ratio.

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