Column Cond Des

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PROCESS DESIGN-MAJOR EQUIPMENT Distillation Tower – 2. This tower has a feed, binary mixture of methanol and water. Assumptions : 1. Feed is the saturated li quid entering at b.p of m ethanol. 2. All assum ptions for McCa be – Thiele method hold good here. 3. No he at loss from column. From the material balance of this tower, we obtain, D, Distillate (methanol) = 130.189 kmole s/hr W, Residue (water) = 8.171 kmole s/hr Since feed is saturated liquid, slope of q-line is .Using equilibrium data for methanol from Perry. X D  / (R m + 1) = 0.655; R m = 0.5226 Assume reflux ratio 1.5 times the minimum, then R = 0.7839; X D  / (R +1) = 0.559 The plot gives Æ  No. of ideal stages = 17 No. of ideal stages in tower = 16 No. of enri ching section stag es = 11 No. of stripping section stages = 6 Feed enters at 11 th tray. L = R.D = 102.055 kmoles /hr G = L + D = 232.244 kmoles /hr L = L + qF = 240.415 kmoles /hr G = G = 232.244 kmole s /hr Table 3 :

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