The following feed mixture is to be separated by ordinary distillation at 120 psia so as to obtain 92.5 mol% of the nC4 in the liquid distillate and 82.0 mol% of the iC5 in the bottoms.

(a) Estimate the minimum number of equilibrium stages required by applying the Fenske equation. Obtain K-values from figures.

(b) Use the Fenske equation to determine the distribution of nonkey components between distillate and bottoms.

(c) Assuming that the feed is at its bubble point, use the Underwood method to estimate the minimum-reflux ratio.

(d) Determine the number of theoretical stages required by the Gilliland correlation assuming L/D = 1.2(L/ D)min , a partial reboiler, and a total condenser.

(e) Estimate the feed-stage location.

Transcribed Image Text:

Ibmol/h Component 5 C3 iC4 nC4 iC5 nC5 15 25 20 35 100