I have been stuck on this for a long time, and now I understand. Thank you for taking your time to make this helpful video! (:
@abuali2912
6 жыл бұрын
hi kindly answer below question fractionating column is to be designed to separate 100 liters per second of feed at 20 °C with a composition of 69 vol% Methanol and 31 vol% Water into a top product of 98 vol% Methanol and a bottom product of 95 vol% Water at twice the minimum reflux ratio. You can assume that the column operates with a total condenser. The VLE data is provided in Table 1. a) Perform a mass balance on the column and determine the molar flows & compositions of the feed, top product and bottom product streams. b) Determine the value of q, the slope of the q-line, and the intercept it makes with the x-axis. c) Determine graphically the minimum reflux ratio, and the minimum number of theoretical stages within the column. d) Determine the number of theoretical stages in the column at the normal operating conditions, i.e. when the reflux ratio is twice the minimum. e) Determined the amount of steam required for the reboiler. f) Determine the cooling duty for the total condenser. g) Determine the minimum number of theoretical stages using the Fenske-Underwood equation, and compare them with the value obtained by graphical construction in part d). Thermodynamic Data: Steam at 2.5 bar pressure is available for heating. From steam tables, this has a latent heat of 2182 kJ.kg-1 Molecular weight of Methanol = 32 g.mol-1 Density of Methanol = 792 kg.m-3 Molar latent heat for Methanol = 35300 J.mol-1 Specific heat capacity for Methanol =2.5 kJ.kg-1.K-1 Molecular weight of Water = 18 g.mol-1 Density of Water = 1000 kg.m-3 Molar latent heat for Water = 40626 J.mol-1 Specific heat capacity for Water = 4.18 kJ.kg-1.K-1 Show transcribed image text Expert Answer Anonymous answered this Was this answer helpful? 0 1 189 answers According to chegg rules we should solve first part of the question if more than four subparts involved in the question View comments (3)
@martyskelton
4 жыл бұрын
Thanks for the video. Are there good ways to extend this beyond binary systems? Or does the whole approach assume that you start with a defined mix of components you want at the top of the column and a defined mix you want at the bottom? What about in cases where you have side streams that are taken off mid-column? Would it be best to model each section (from one take-off point to the next) with it's own y-x plot?
@alirabeh1633
5 жыл бұрын
thanks man
@paladinoestetica
4 ай бұрын
thx for this very easy explaation
@mariogarcia4003
5 жыл бұрын
And what are the reasons why you need more stages? Or for a fixed number of stages, increase the reflux ratio?
@jay.jay.
3 жыл бұрын
Yes, increase the reflux which means trying to obtain more pure distillate.
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