Question

Calculate ln S? If XLK=0.95 and XHK = 0.05 and XL= 0.90 and X^H= 0.10, then

(a) 6.77

(b) 5.142

(c) 7.898

(d) Can’t be calculated

This question was posed to me in examination.

This intriguing question comes from The Jafarey, Dougles and Mcavoy Equation in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design

Answer 1

Right option is (b) 5.142

For explanation I would say: as ln (0.95/0.05) (0.90/0.10) = 5.142.