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24 Lr + Fq and Vs = V + F(q − 1), via an enthalpy balance on - Ve obtained the equations, Ls he feed stage. These equations would be provided but you should be able to perform the balance o obtain them if required. = gain, the operating line was obtained by a component balance, this time between stage i and the ottom of the column. Note that the gradient of the each operating line is the ratio of vapour and vid fl

24 Lr + Fq and Vs = V + F(q − 1), via an enthalpy balance on - Ve obtained the equations, Ls he feed stage. These equations would be provided but you should be able to perform the balance o obtain them if required. = gain, the operating line was obtained by a component balance, this time between stage i and the ottom of the column. Note that the gradient of the each operating line is the ratio of vapour and vid fl

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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ans =(i) Ls=154 mol/s, Vs=84 mol/s, op-line grad=1.83; (ii)Ls=240.8 mol/s, Vs=112.8 mol/s, op-line grad=2.13; (iii)Ls=299 mol/s, Vs= 109 mol/s, op-line grad=2.74

Q4 We obtained the equations, Ls = Lr + Fq and Vs = the feed stage. These equations would be provided but you should be able to perform the balance to obtain them if required. Vr + F(q − 1), via an enthalpy balance on - Again, the operating line was obtained by a component balance, this time between stage i and the bottom of the column. Note that the gradient of the each operating line is the ratio of vapour and liquid flow rates.
Transcribed Image Text:Q4 We obtained the equations, Ls = Lr + Fq and Vs = the feed stage. These equations would be provided but you should be able to perform the balance to obtain them if required. Vr + F(q − 1), via an enthalpy balance on - Again, the operating line was obtained by a component balance, this time between stage i and the bottom of the column. Note that the gradient of the each operating line is the ratio of vapour and liquid flow rates.
4) a) Determine the vapour and liquid flowrates in the stripping section of the column (Vs and Ls) in each of the following cases, where F is the feed molar flowrate, D is the distillate molar flowrate, R is the reflux ratio and q is the 'quality' of the feed. You may assume that the molar enthalpies of saturated vapour and of saturated liquid are each constant. b) In each of these cases determine the gradient of the 'operating line** for the section of the column below the feed. D/mol s-1 R 1.8 2.9 2.3 F /mol s-1 100 180 320 30 52 130 q 1 (i) (iii) * the stripping operating line is based on a material balance between stage i (any stage below the feed) and the top of the column. 0.5 0
Transcribed Image Text:4) a) Determine the vapour and liquid flowrates in the stripping section of the column (Vs and Ls) in each of the following cases, where F is the feed molar flowrate, D is the distillate molar flowrate, R is the reflux ratio and q is the 'quality' of the feed. You may assume that the molar enthalpies of saturated vapour and of saturated liquid are each constant. b) In each of these cases determine the gradient of the 'operating line** for the section of the column below the feed. D/mol s-1 R 1.8 2.9 2.3 F /mol s-1 100 180 320 30 52 130 q 1 (i) (iii) * the stripping operating line is based on a material balance between stage i (any stage below the feed) and the top of the column. 0.5 0
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