Compound A and B are separated by a distillation tower. The ideal mixture follows Raoult’slaw and Dalton’s law. The saturated vapor pressure of compound A and B are 75 and 40mmHg, 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 theminimum reflux ratio?
(A) 1.6
(B) 2.1
(C) 1.1
(D) 3.7