Elements of Chemical Reaction Engineering (5th Edition) (Prentice Hall International Series in the Physical and Chemical Engineering Sciences)
5th Edition
ISBN: 9780133887518
Author: H. Scott Fogler
Publisher: Prentice Hall
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Chapter 14, Problem 14.5P
The decomposition of cyclohexane to benzene and hydrogen is
Green engineering
- (a) Calculate the number of pipes necessary to achieve 99.9% conversion of cyclohexane from an entering gas stream of 5% cyclohexane and 95% H2 at 2 atm and 500°C.
- (b) Plot conversion as a function of pipe length.
- (c) How much would your answer change if the pellet diameter and length were each cut in half?
- (d) How would your answer to part (a) change if the feed were pure cyclohexane?
- (e) What do you believe is the point of this problem? Is the focus really green CRE? How so?
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Problem 1
Marks: 60
Section: 1a): 30 marks, Section 1b):30 marks
A laboratory scale fluidized bed is considered for studying a catalytic ozone decomposition.
a) It is requested to derive model equations under the following assumptions:
■ Operation of the catalytic reactor under steady state conditions,
There is no influence of thermal ozone decomposition reactions.
The fluidized bed includes bubbles and dense phase.
□ The dense phase can be simulated using a CSTR
The fluidized bed bubbles contain catalyst particles and can be simulated as a DSTR (batch).
□ The jets contain particles and can be simulated with a PFR.
The influence of the freeboard has to be considered using a PFR model.
The available catalytic reaction rate model is r (moles/gcat.s)= -k CA
b) Same than on a) under unsteady state conditions, using an absorbable and reactive tracer.
Note: A step-by step derivation of the model equations is required here. A quick answer will not do.
Problem 2 Marks: 40
Section 2a: 30 marks,…
Penicillin process
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Production of bakers’ yeast
Bakers’ yeast is produced in a 50,000-litre fermenter under aerobic conditions. The carbon substrate is sucrose; ammonia is provided as the nitrogen source. The average biomass composition is CH_1.83O_0.55N_0.17 with 5% ash. Under conditions supporting efficient growth, biomass is the only major product and the biomass yield from sucrose is 0.5 g g^−1. If the specific growth rate is 0.45 h^−1, estimate the rate of heat removal required to maintain constant temperature in the fermenter when the yeast concentration is 10 g l^−1.
Chapter 14 Solutions
Elements of Chemical Reaction Engineering (5th Edition) (Prentice Hall International Series in the Physical and Chemical Engineering Sciences)
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