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11. Parallel reactions in CSTR The following reactions take place in a CSTR: A > 3/2 B ; A –2 > 1/2 C. The first one follows the rate law ri = kj[A]² (i.e. it is not 1st order!); the second one is simple. a) Analyse the dependence of the composition of the reactor on its space-time 7. b) B is the desired product. What space-time corresponds to desirable conversion of 90%? What is the undesirable conversion under these conditions? c) Plot the dependence of the composition on the space-time of the reactor. Use units min for the space-time axis. d) The undesired product C has a maximum as a function of t. Find its position and magnitude, and mark it on the plot. Parameters: k = 8.1×10-4 M²s1; k2 = 6.6×10ª s1; [A]o = 0.45 M.

11. Parallel reactions in CSTR The following reactions take place in a CSTR: A > 3/2 B ; A –2 > 1/2 C. The first one follows the rate law ri = kj[A]² (i.e. it is not 1st order!); the second one is simple. a) Analyse the dependence of the composition of the reactor on its space-time 7. b) B is the desired product. What space-time corresponds to desirable conversion of 90%? What is the undesirable conversion under these conditions? c) Plot the dependence of the composition on the space-time of the reactor. Use units min for the space-time axis. d) The undesired product C has a maximum as a function of t. Find its position and magnitude, and mark it on the plot. Parameters: k = 8.1×10-4 M²s1; k2 = 6.6×10ª s1; [A]o = 0.45 M.

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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11. Parallel reactions in CSTR The following reactions take place in a CSTR: A » 3/2 B ; A 2 → 1/2 C . 1/2 The first one follows the rate law ri = k|[A]2 (i.e. it is not 1st order!); the second one is simple. a) Analyse the dependence of the composition of the reactor on its space-time r. b) B is the desired product. What space-time corresponds to desirable conversion of 90%? What is the undesirable conversion under these conditions? c) Plot the dependence of the composition on the space-time of the reactor. Use units min for the space-time axis. d) The undesired product C has a maximum as a function of t. Find its position and magnitude, and mark it on the plot. Parameters: ki = 8.1×104 M2s; k2 = 6.6×104 s!; [A]o = 0.45 M.
Transcribed Image Text:11. Parallel reactions in CSTR The following reactions take place in a CSTR: A » 3/2 B ; A 2 → 1/2 C . 1/2 The first one follows the rate law ri = k|[A]2 (i.e. it is not 1st order!); the second one is simple. a) Analyse the dependence of the composition of the reactor on its space-time r. b) B is the desired product. What space-time corresponds to desirable conversion of 90%? What is the undesirable conversion under these conditions? c) Plot the dependence of the composition on the space-time of the reactor. Use units min for the space-time axis. d) The undesired product C has a maximum as a function of t. Find its position and magnitude, and mark it on the plot. Parameters: ki = 8.1×104 M2s; k2 = 6.6×104 s!; [A]o = 0.45 M.
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