Page 453 - Elements of Chemical Reaction Engineering Ebook

424 Nonelementary Reaction Kinetics Chap. 7

cDp7-A~ Determine the rate law and mechanism for the reaction
2GCH, --+ 2G = CH, +H2

[2nd Ed. P7-6~1
CDP7-BA Suggest a mechanism for the reaction
I- + oc1- ---+ 01- + CI-
[2nd Ed. P7-8B]
Develop a rate law for substrate inhibition of an enzymatic reaction.
[2nd Ed. P7-16A]
Use POLYMATH to analyze an enzymatic reaction. [2nd Ed. P7-]9B].
Redo Problem P7-17 to include chain transfer. [2nd Ed. P7-23B]
Determine the rate of diffusion of oxygen to cells. [2nd Ed. PI 2- 1281
Determine the growth rate of ameoba predatory on bacteria. [2nd Ed.
P 1 2- 1 5,]
Plan the scale-up of an oxygen fermentor. [2nd Ed. PI 2- I 6BJ
Assess the effectiveness of bacteria used for denitrification in a batch
reactor. [2nd Ed, P12-18~1
CDP7-JA Determine rate law parameters for the Monod equation. [2nd Ed.
P12-19,]

JOURNAL CRITIQUE PROBLEMS

wc - 1 Compare the theoretical curve with actual data points in Figure 5b [Biotech-
nol. Bioeng., 24, 329 (1982)], a normalized residence-time curve. Note that
the two curves do not coincide at higher conversions. First, rederive the rate
equation. and the normalized residence-time equations used by the authors,
and then, using the values for kinetic constants and lactase concentration cited
by the authors, see if the theoretical curve can be duplicated. Linearize the
normaked residence-time equation and replot the data, the theoretical curve
in Figure 5b, and a theoretical curve that is obtained by using the constants
given in the paper. What is the simplest explanation for the results observed?
wc - 2 In Figure 3 [Biofechnol. Bioeng., 23, 361 (1981)], 1/V was plotted against
(l/S)( 1 IPGM) at three constant 7-ADCA concentrations, with an attempt to
extract V,,, for the reaction. Does the V,,, obtained in this way conform to
the true value? How is the experimental V,,, affected by the level of PGM in
the medium?
wc - 3 In J. Catal., 79, 132 (1983), a mechanism was proposed for the catalyzed
hydrogenation of pyridine in slurry reactors. Reexamine the data and model
using an Eley-Rideal adsorption mechanism and comment on the appropriate-
ness of this new analysis.

SUPPLEMENTARY READING
1. A discussion of complex reactions involving active intermediates is given in
FROST, A. A., and R. G. PEARSON, Kinetics and Mechanism, 2nd ed. New York:
Wiley. 1961, Chap. 10.