Question

8 The feed to a fractionating column operating at atmospheric pressure has the composition of 60 mole % methanol and 40 mole % water. The top product should be 90 mole % methanol and the bottom product should not contain more than 10 mole %. The vapour. liquid equilibrium data for the methanol-water system at atmospheric pressure is supplied in the table below Equilibrium data for nethanol-water system 0.2 0.3 0.4 0.5 0.417 0.5790.6690.729 0.780 0.825 0.87 .915 0.959 .0 Use the McCabe-Thiele method to answer the following questio (a) Determine the minimum number of stages [4 stages] (b) If the feed is all vapour at its boiling point, (i) Determine the minimum reflux ratio [0.789] (ii) For a reflux ratio of 1 determine the number of theoretical trays required and the location of the feed tray [ 6 trays; feed point is plate number 4 from top] (iii) If the overall tray efficiency is 70%, how many actual trays are required in the column and on which tray should the feed enter 9 trays] (c) If 60 mole % of the feed is liquid and 40 mole % is vapour, determine the number of theoretical trays required and the location of the feed tray (reflux ratio is 1) [5 trays; feed point is plate number from the top] What is the effect of increasing the proportion of liquid in the feed?

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Answer 1

Selion Given that 6 feedl empaslHon of methanol dlistillale composiion -o- d) Aelert mine the min'mum numben of s Assume first total rtePlux eynjtion at toto hePlux -the minimum number of steizes voill ocurte.cut total telun both the une l nge U'ne wil) meange. "[oHa main opena.hr, line. Frm the Me-cabe theile diasxam Nuwbe of tages mloimum)N stee We b) If the feed is all opot ais beiling point sahunased vapor) R11. Slope

bi) From thL Me-rabe 'Thiele ding,am 08ns blii) for the R- lsi -', "Tota! Number of stages N = 6 Feed skape from top Nie-4 13 Answe bili) 뜨f the overall tung efficienu is,チ09. Idea) tra hst0

C. f 60m9% of the tisuld feed Given R Slope of 오 Une- 0:6 -1.5 0.6-1 θ =-56.30 from the Me-cabe sele slrapram cum. Toal number of s NS feed slane from toE3 Anever 米Tu effedor increasin 'the ?roporchon oft'guld ίη the feed is the number of will be vnc teayint at Mu ОС.CLHon will be ein hsw

바. Mini 午 IN243

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