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Consider a binary, multi-stage distillation column. The molar enthalpies of turated vapour and of saturated liquid can be assumed to be constant, with values h₁=6.0 kJ mol-¹ and hy=41.0 kJ mol-1; the specific heat capacities of vapour and uid can be taken as Cp,/ 68 J mol-1 K-1 and Cp,v: = 22 J mol-1 K-¹ respectively. etermine the 'quality' of the feed, q, in each of the following cases, V (i) (ii) Saturated liquid feed. Saturated vapour feed. Food consisting of vanour and liquid in equilibrium consisting of 60%

Consider a binary, multi-stage distillation column. The molar enthalpies of turated vapour and of saturated liquid can be assumed to be constant, with values h₁=6.0 kJ mol-¹ and hy=41.0 kJ mol-1; the specific heat capacities of vapour and uid can be taken as Cp,/ 68 J mol-1 K-1 and Cp,v: = 22 J mol-1 K-¹ respectively. etermine the 'quality' of the feed, q, in each of the following cases, V (i) (ii) Saturated liquid feed. Saturated vapour feed. Food consisting of vanour and liquid in equilibrium consisting of 60%

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 = Q3. (i) 1; (ii)0; (iii)0.4; (iv)1.08; (v) -0.038

3) Consider a binary, multi-stage distillation column. The molar enthalpies of saturated vapour and of saturated liquid can be assumed to be constant, with values of h=6.0 kJ mol-¹ and hy=41.0 kJ mol-¹; the specific heat capacities of vapour and liquid can be taken as Cp,l =68 J mol-¹ K-1 and Cp,v = 22 J mol-¹ K-¹ respectively. Determine the 'quality' of the feed, q, in each of the following cases, (i) (ii) (iii) (iv) (v) Saturated liquid feed. Saturated vapour feed. Feed consisting of vapour and liquid in equilibrium, consisting of 60% vapour and 40% liquid on a molar basis. Liquid feed sub-cooled by 40 K. Vapour feed that is super-heated by 60 K. (N.B. liquid feed slightly below the saturation temperature is a common way of running columns in practice).
Transcribed Image Text:3) Consider a binary, multi-stage distillation column. The molar enthalpies of saturated vapour and of saturated liquid can be assumed to be constant, with values of h=6.0 kJ mol-¹ and hy=41.0 kJ mol-¹; the specific heat capacities of vapour and liquid can be taken as Cp,l =68 J mol-¹ K-1 and Cp,v = 22 J mol-¹ K-¹ respectively. Determine the 'quality' of the feed, q, in each of the following cases, (i) (ii) (iii) (iv) (v) Saturated liquid feed. Saturated vapour feed. Feed consisting of vapour and liquid in equilibrium, consisting of 60% vapour and 40% liquid on a molar basis. Liquid feed sub-cooled by 40 K. Vapour feed that is super-heated by 60 K. (N.B. liquid feed slightly below the saturation temperature is a common way of running columns in practice).
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: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.
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