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The following reactions, all of which follow elementary rate laws, occur in the liquid phase in a plug-flow reactor that operates isothermally, A 3 B Eact, 1 = 25 kJ mol¹ 1/2 A2C Eact, 2 = 50 kJ mol¹ C → D Eact, 3 = 80 kJ mol‍¹ Pure A is fed to the PFR at a concentration of CA, 0. 1) Express the species balance equations in terms of species concentrations and rate coefficients, using residence time (t) as the independent variable. 2) Write an equation for the instantaneous selectivity of species B relative to species C and D (SB/C, D) in terms of species concentrations and rate coefficients. For this part of the problem (and part 3), you can treat the first reaction as irreversible. 3) Based on the solution to part (2), comment on whether a PFR or CSTR will be optimal for maximizing the selectivity to species B. How would your answer change if you could not consider Step 1 irreversible? 4) Would increasing or decreasing the temperature increase or decrease the selectivity to species B (assume for this part that Step 1 is irreversible).

The following reactions, all of which follow elementary rate laws, occur in the liquid phase in a plug-flow reactor that operates isothermally, A 3 B Eact, 1 = 25 kJ mol¹ 1/2 A2C Eact, 2 = 50 kJ mol¹ C → D Eact, 3 = 80 kJ mol‍¹ Pure A is fed to the PFR at a concentration of CA, 0. 1) Express the species balance equations in terms of species concentrations and rate coefficients, using residence time (t) as the independent variable. 2) Write an equation for the instantaneous selectivity of species B relative to species C and D (SB/C, D) in terms of species concentrations and rate coefficients. For this part of the problem (and part 3), you can treat the first reaction as irreversible. 3) Based on the solution to part (2), comment on whether a PFR or CSTR will be optimal for maximizing the selectivity to species B. How would your answer change if you could not consider Step 1 irreversible? 4) Would increasing or decreasing the temperature increase or decrease the selectivity to species B (assume for this part that Step 1 is irreversible).

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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The following reactions, all of which follow elementary rate laws, occur in the liquid phase in a plug-flow reactor that operates isothermally, A 3 B Eact, 1 = 25 kJ mol¹ 1/2 A2C Eact, 2 = 50 kJ mol¹ C → D Eact, 3 = 80 kJ mol‍¹ Pure A is fed to the PFR at a concentration of CA, 0. 1) Express the species balance equations in terms of species concentrations and rate coefficients, using residence time (t) as the independent variable. 2) Write an equation for the instantaneous selectivity of species B relative to species C and D (SB/C, D) in terms of species concentrations and rate coefficients. For this part of the problem (and part 3), you can treat the first reaction as irreversible. 3) Based on the solution to part (2), comment on whether a PFR or CSTR will be optimal for maximizing the selectivity to species B. How would your answer change if you could not consider Step 1 irreversible? 4) Would increasing or decreasing the temperature increase or decrease the selectivity to species B (assume for this part that Step 1 is irreversible).
Transcribed Image Text:The following reactions, all of which follow elementary rate laws, occur in the liquid phase in a plug-flow reactor that operates isothermally, A 3 B Eact, 1 = 25 kJ mol¹ 1/2 A2C Eact, 2 = 50 kJ mol¹ C → D Eact, 3 = 80 kJ mol‍¹ Pure A is fed to the PFR at a concentration of CA, 0. 1) Express the species balance equations in terms of species concentrations and rate coefficients, using residence time (t) as the independent variable. 2) Write an equation for the instantaneous selectivity of species B relative to species C and D (SB/C, D) in terms of species concentrations and rate coefficients. For this part of the problem (and part 3), you can treat the first reaction as irreversible. 3) Based on the solution to part (2), comment on whether a PFR or CSTR will be optimal for maximizing the selectivity to species B. How would your answer change if you could not consider Step 1 irreversible? 4) Would increasing or decreasing the temperature increase or decrease the selectivity to species B (assume for this part that Step 1 is irreversible).
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