ELEMENTS OF CHEM. REACTION ENGR
5th Edition
ISBN: 9780135486498
Author: Fogler
Publisher: INTER PEAR
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Chapter 18, Problem 18.6P
Use the data in Example 16-2 to make the following determinations. (The volumetric feed rate to this reactor was 60 dm3/min.)
- (a) Calculate the Peclet numbers for both open and closed systems.
- (b) For an open system, determine the space time τ and then calculate the % dead volume in a reactor for which the manufacturer’s specifications give a volume of 420 dm3.
- (c) Using the dispersion and tanks-in-series models, calculate the conversion for a closed vessel for the first-order isomerization
with k = 0.18 min−1.
- (d) Compare your results in part (c) with the conversion calculated from the tanks-in-series model, a PFR, and a CSTR.
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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
Penicillium chrysogenum is used to produce penicillin in a 90,000-litre fermenter. The volumetric rate of oxygen uptake by the cells ranges from 0.45 to 0.85 mmol l^−1 min^−1 depending on time during the culture. Power input by stirring is 2.9 W l^−1. Estimate the cooling requirements.
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 18 Solutions
ELEMENTS OF CHEM. REACTION ENGR
Ch. 18 - The second-order liquid-phase reaction AB+C is to...Ch. 18 - The elementary liquid-phase reaction...Ch. 18 - Prob. 18.5PCh. 18 - Use the data in Example 16-2 to make the following...Ch. 18 - A tubular reactor has been sized to obtain 98%...Ch. 18 - Prob. 18.11PCh. 18 - Prob. 18.13PCh. 18 - Prob. 18.14PCh. 18 - Prob. 18.15PCh. 18 - Consider the following system in Figure P18-16C...
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