In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of_________________? February 16, 2019 – by admin In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of_________________? A. 1.5 B. -0.6C. -1.5 D. 0.6