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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) Saturated liquid feed. Saturated vapour feed. Feed consisting of vapour and liquid in equilibrium. consisting of 60%

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) Saturated liquid feed. Saturated vapour feed. Feed consisting of vapour 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

Q3 (iii) By subbing in for hf, we find that for mixed vapour/liquid feed, the value of q is equal to the liquid fraction, which is consistent with q=0 for saturated vapour and q=1 for saturated liquid. (iv) The molar enthalpy of sub-cooled liquid is less than that of saturated liquid. The molar enthalpy falls by Cp for each degree of cooling. (v) By analogy, the molar enthalpy of super-heated vapour is greater than that of saturated vapour. 04
Transcribed Image Text:Q3 (iii) By subbing in for hf, we find that for mixed vapour/liquid feed, the value of q is equal to the liquid fraction, which is consistent with q=0 for saturated vapour and q=1 for saturated liquid. (iv) The molar enthalpy of sub-cooled liquid is less than that of saturated liquid. The molar enthalpy falls by Cp for each degree of cooling. (v) By analogy, the molar enthalpy of super-heated vapour is greater than that of saturated vapour. 04
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).
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