Homework Assignments for ChE 423
Spring, 2008
Assignment # 1
1. Pick a group of no more than 3 people
2. Write a memo which includes:
- who your group members are
- the engineering honor code and a commitment to not using any solution manuals or previously done homework
- a statement of commitment to the group, to meeting together and helping each other and whatever else you would like to add
- signatures from each member
Chapter 1 Individual Assignment
0. Read Chapter 1
1. P1-3
2. Calculate the volume of a CSTR and of a PFR needed to convert 10 L/min of a 2.0 M solution of A to a concentration of 0.1 M. The reaction is A --> B, the rate law is -r = k CA, where k is 0.01667 sec-1. Which is larger? Why?
3. For the reaction given in problem 2, calculate (and graph on one graph) time versus CA/CA0
from 1 to 0.001 for a constant volume batch reactor.
Chapter 1 Group Assignment
1. What assumptions are made in the derivations of the design equations for a (a) a batch reactor, (b) a CSTR, (c) the PFR, and (d) the PBR?
2. P1-9
3. The reaction F --> G is to be carried out isothermally in a continuous flow reactor. Calculate both the CSTR and PFR volumes needed to achive 95% conversion of F to G when the entering flow rate is 1 mol / minute, assuming
a) -rF = 0.1 mol/(min*
L)
b) -rF = 0.0008 L/(mol*sec)CF2
c) -rF = 0.05 1/(sec)CF
d) repeat for 99 and 99.5% conversions.
4. P-1-17
Chapter 2 Individual
0. Reach Chapter 2
1. Problem P2-4
2. The exothermic reaction G --> C + Z was carried out adiabatically and the following data recorded:
X |
-rG |
0 |
.01666 |
0.2 |
0.02783 |
0.4 |
0.0833 |
0.45 |
0.0833 |
0.5 |
0.0833 |
0.6 |
0.0833 |
0.8 |
0.02083 |
0.9 |
0.01516 |
The entering molar flow rate of G is 5 mol/sec.
a. What are the PFR and CSTR volumes necessary to achieve 40% conversion?
b. Over what range of conversions would the CSTR adn PFR reactor volumes be identical?
c. What is the maximum conversion that can be achieved in a 10.5 L CSTR?
d. What conversion can be achieved if a 72 L CSTR is followed in series by a 24 L CSTR?
e. What conversion can be achieved if a 24 L CSTR is followe by a 72 L PFR?
f. Plot the conversion and rate of reaction as a function of PFR reactor volume up to a volume of 100 L.
3. Problem P2-9
Chapter 2 Group Assignment
Do this as a group
1. Problem pCDP2-C
Chapter 3 Individual Assignment
0. Read Chapter 3
1. Problem P3-2 (a-f)
2. Determine the activation energy and frequency factor from the following data:
| T (C) | k (sec-1) |
| 0.0 | 1.667x10-5 |
| 100.0 | 8.333x10-4 |
3. Problem P3-13
Chapter 4 Individual Assignment
0. Read Chapter 4
1. P4-2a-f
2. P4-5
Chapter 4 Group Assignment
AS A GROUP
1. P4-7
Chapter 5 Individual Assignment
0. Read Chapter 5
1. P5-4
2. P5-5
3. P5-9
4. P5-11
Chapter 5 Group Assignment
AS A GROUP
1. P5-6
2. P5-8
3. P5-16
Chapter 6 Individual Assignment
0. Read Chapter 6
1. P6-2a
2. P6-2c
3. P6-5a
Chapter 6 Group Assignment
1. Problem p6-8a
2. Problem p6-8b
3. Problem p6-8c
4. Problem p6-8d
Chapter 8 Individual Assignment
0. Read Chapter 8 through section 8
1. P8-5
2. P8-6
3. P8-18a-g