D22. A distillation column with five equilibrium contacts (including the partial reboiler) operating at total reflux is separating benzene (B) and toluene (T) plus an unknown impurity (U). Relative volatilities can be assumed to be constant, and B-T = 2.5. The fractional recovery of toluene in the bottoms is FR = 0.90. The fractional recovery of unknown in the bottoms is FR₁ What is the value of FRB.dist? What is the value of au-T? T,bot U,bot a. b. = 0.95. =

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