6、 Compound A and B are separated by a distillation tower. The ideal mixture follows Raoult’s
law and Dalton’s law. The saturated vapor pressure of compound A and B are 75 and 40
mmHg, respectively. The concentration of overhead product, feed, and bottom product are 0.9,
0.5 and 0.1, respectively. The feed is liquid at the boiling point. What is the value of the
minimum reflux ratio?
(A) 1.6 (B) 2.1 (C) 1.1 (D) 3.7