Question

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(b) A saturated vapour of methanol and water contains 45 mol% methanol and is to be separated using an enriching column. 250 kmol/h is fed to the bottom of the column operating at atmospheric pressure. Vapour from the top of the column is to contain 85 mol% methanol. A total condenser operates at the top of the column with a reflux ratio of 1.5 If CMO applies, determine the bottoms composition, the internal flow rates (L and V) and the number of equilibrium stages. (10 marks) Equilibrium diagram provided. Methanol/Water @ 1 atm 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.9 1 0.4 0.5 0.6 0.7 0.8 O 0.1 0.2 0.3 Mole fraction methanol in liquid mole fraction methanol in vapour

Answer 1

Soludion Total Candenleg 2 R = D 3 G, L,n Ensiching Section (Given) O45 Ceed 4/704 CGriven) Griven) 250 Kmol 18.0 CGriven) R 5

all .Lotent heat The Condenses Aemoves vapor but does net from the oveehead Lig uid Coot FiAtherthe the AesuLting Peflux and ds Llate Product will be theree Lizeids at bobble point and Ccmo) Land G Consdand ahe Ensiching Column oerading Line dnt R+ R+ wiLL fram CaleuLade we equation, given Cre 1.5 o85 Cn) o.45 2.5 2.5 n

Compositon bottom So 7auu 8t methanoL balance male Naw, 259 L+D and DXp 25-) Co.45) Lo18) .1L 112.5 ナ 85 Dニ egeation SoLving and Co&5) O.85L ○r85D すニ 250 X o850 + 0850 or85L 212.5 112.5 O18L O.67 L 149- 25 fLin egvaton PUt thi's value

149.25 250 D = Kmol/ h 100.75 D indesnal Flow rades 149.25 Kmol/h L : vr 25o kmol/h ofepuilibum Now e numbere Selages PLot opeading Graabh) CNext page) Line gRaph Csce Bee the graah can Calcu Lade we that n= 3 epilihionJages Fu number

Methanol/Water @ 1 atm 1 0.9 0.8 0.7 operating line 0.6 0.5 Yn+1 0.4 0.3 0.2 0.1 0 Xn 0 0.1 0.2 0.9 1 0.4 0.5 0.6 0.7 0.8 0.3 Mole fraction methanol in liquid mole fraction methanol in vapour