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

(a) Estimate Nmin by the Fenske equation. 

(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 Rmin. 

(d) Determine N by the Gilliland correlation assuming R/Rmin = 1.2, a partial reboiler, and a total condenser. 

(e) Estimate feed-stage location.

Transcribed Image Text:

Component C3 iC4 nC₁ iCs nC5 Avg a 4.36 2.36 1.88 1.00 0.84 Ibmol/h 5 15 25 20 35 100