Distillation Control Variables ◾  11
Exercises
2.1 With a reflux ratio (R/D) of 4.0 and a material balance
split (D/F) of 0.5, what is the ratio of reflux/feed?
2.2 If the reflux ratio (R/D) is 3.0, what is the ratio of reflux
to overhead vapor (R/O)?
Reference
1. McCabe, W. L., and Thiele, E. W., Graphical design of fractionating columns, Ind. Eng Chem., 17, 605, 1925.