Question: Ethanol forms a nearly ideal solution with iso - butanol and has a relative volatility 2 . 2 . A heated feed containing 4 0

Ethanol forms a nearly ideal solution with iso $-$ butanol and has a relative volatility $2.2 .$ A heated feed containing $40$ mole $%$ ethanol and $60$ mole $%$ iso $-$ butanol enters a flash drum at a rate of $50$ kmol $/$ h $.$ Prepare a plot of the fractional yield of the distillate versus its composition. What fraction of the feed should be vaporized in order to have a bottom product containing not more than $10 %$ ethanol?

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