Page 94 - Elements of Chemical Reaction Engineering 3rd Edition

66 Conversion and Reactor Sizing Chap. 2

(a) Assuming that you have a CSTR and a PBR containing equal weights of
catalyst, how should they be arranged for an isothermal reaction and for
adiabatic reaction? In each case use the, smallest amount of catalyst
weight and still achieve 80% conversion.
(b) What is the catalyst weight necessary to achieve 80% conversion in a
well-mixed reactor with catalyst particles (e.g., CSTR)?
(c) What “CSTR” weight is necessary to achieve 40% conversion?
(d) What PBR weight is necessary to achieve 80% conversion?
(e) What PBR weight is necessary to achieve 40% conversion?
(f) Plot the rate of reaction and conversion as a function of PBR volume.
(g) Write a paragraph describing how you would arrange reactors for differ-
ent - ri versus x curves.
Additional information: FA0 = 2 mol/s.
P2-13 Using POLYMATH, MatLab, Mathmatica, or some other software package,
first fit the -r, versus X to a polynominal (i.e., -rA = a. + a,X + a2X2).
Next use this polynomial and an ODE solver to plot the conversion down the
length (Le., volume) of a PFR and find the CSTR volume for 80% converison
for an entering molar flow rate of 5 molls.
(a) Use the data in Table 2-2.
(b) Use the data in Problem 2-6.
(e) Use the data in Problem 2-9.
(d) Use the data in Figure P2-12.
P2-14, What is a typical reactor size for:’
(a) cracking furnaces?
(b) packed beds?
(c) fluidized beds?
(d) pilot-plant-scale CSTR?
(e) industrial-scale CSTR?
For parts (b) and (c) specify the catalyst dimensions in addition to the dimen-
sions of the reactor.
P2-15, Review &he reactor volumes calculated in each of the example problems in this
chapter. Using the methanol reactor described in Chem. Eng. Prog., 79(7), 64
(1983) as a basis of comparison, classify each of the reactor sizes and flow
rates in the example problems as industrial, pilot plant, or laboratory scale.
P2-16, Load the Interactive Computer Module (ICM) from the CD-ROM. Run the module
and then record your performance number for the module which indicates your mas-
tering of the material. Your professor has the key to decode your performance numbec
ICM Reactor Staging Performance ##
CD - ROM MATERfAL
Learning Resources
I. Summary Notes for Lectures I and 2
2. Web Module
--.- A. Hippopotamus Digestive System
- J> Interactive Computer Modules
3.
A.
a-,
Staging
Reactor
4. Solved Problems
A. CDP2-AB More CSTR and PFR CaIculations - No Memorization
0 FAQ [Frequently Asked Questions]- In UpdatesPAQ icon section
0 Additional Homework Problems
See the Supplementary Reading lists for Chapters 1 and 2.