ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 3 Due March 16th at 4:00 pm
1.
[30 pts] The irreversible elementary gas phase reaction:
A + BC + D
is carried out isothermally at 305K in a packed-bed reactor with 100 kg of catalyst.
The inlet

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 3 Due March 16th at 4:00 pm
1.
[30 pts] The irreversible elementary gas phase reaction:
A + BC + D
is carried out isothermally at 305K in a packed-bed reactor with 100 kg of catalyst.
The inlet

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 1 Due January 25th at 4:00 pm
1.
Consider the representative reaction 2A + B C + D. For parts (a) through (f) of this question, assume that the rate is
to be expressed in units of moles per volu

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 1 Due January 25th at 4:00 pm - Solution
1.
Consider the representative reaction 2A + B C + D. For parts (a) through (f) of this question, assume that the rate is
to be expressed in units of mol

ENCH 421 Chemical Engineering Kinetics
Midterm Exam March 4, 2016
12:00 2:00 PM
EXAM BOOKLET
Closed Textbook / Closed Notes
Non-Programmable Calculators Only
Time: 12.00 2.00 pm
Total Points: 100
Number of Questions: 5
First Name :
Last Name :
Student I.D

P4-5A
Set up a stoichiometric table for each of the following reactions and express the concentration of each species
in the reaction as a function of conversion, evaluating all constants (e.g., e, 0). Next, assume the reaction
follows an elementary rate

P253
You have two CSTRs and two PFRs, each with a volume of 1.6 m3. Use Figure 228 to calculate the
conversion for each of the reactors in the following arrangements.
a. Two CSTRs in series.
b. Two PFRs in series.
c. Two CSTRs in parallel with the feed, F

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 4 Due March 30th at 4:00 pm
[70 pts] Airbags contain a mixture of NaN3, NaNO3, and SiO2. An accelerometer is used to detect the change of speed. If
the deceleration is great enough, the accelero

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 2 Due February 11th at 4:00 pm
1.
[20 pts] The gas-phase
phase oxidation of nitric oxide is represented by the overall macroscopically observed reaction:
2 NO + O2 2 NO2
Like most third-order re

Page 1 of 1
POLYMATH Report
Ordinary Differential Equations
20-Mar-2017
Calculated values of DEQ variables
Variable Initial value Minimal value Maximal value Final value
1 t
0
0
2000.
2000.
2 CA
0.02
4.497E-06
0.02
4.497E-06
3 CR
0
0
0.0075101
4.026E-05
4

Page 1 of 1
POLYMATH Report
No Title
20-Mar-2017
Ordinary Differential Equations
Calculated values of DEQ variables
Variable Initial value Minimal value Maximal value Final value
1 t
0
0
2000.
2000.
2 CA
0.02
0.0023065
0.02
0.0023065
3 CR
0
0
0.0069892
0.

Page 1 of 1
POLYMATH Report
No Title
20-Mar-2017
Ordinary Differential Equations
Calculated values of DEQ variables
Variable Initial value Minimal value Maximal value Final value
1 t
0
0
2000.
2000.
2 CA
0.02
0.0001103
0.02
0.0001103
3 CR
0
0
0.0064888
0.

Page 1 of 1
POLYMATH Report
No Title
20-Mar-2017
Ordinary Differential Equations
Calculated values of DEQ variables
Variable Initial value Minimal value Maximal value Final value
1 t
0
0
1200.
1200.
2 CA
0.02
0.0054725
0.02
0.0054725
3 CR
0
0
0.0069893
0.

Page 1 of 2
POLYMATH Report
No Title
20-Mar-2017
Ordinary Differential Equations
Calculated values of DEQ variables
Variable Initial value Minimal value Maximal value Final value
1 V
0
0
0.417
0.417
2 FC
0.00411
0.0039325
0.00411
0.0039325
3 FL
0.0185
0.0

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 2 Due February 11th at 4:00 pm
1.
[20 pts] The gas-phase oxidation of nitric oxide is represented by the overall macroscopically observed reaction:
2 NO + O2 2 NO2
Like most third-order reaction

ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Assignment 4 Due March 30th at 4:00 pm
1.
[70 pts] Airbags contain a mixture of NaN3, NaNO3, and SiO2. An accelerometer is used to detect the change of
speed. If the deceleration is great enough, the accel

ENCH 421 Chemical Engineering Kinetics
Tutorial 9
1.
[Heat of reaction] From the Hc and Hf tables, we've calculated that the standard heat of reaction for our gasphase reaction at 25C is as follows:
,(298)
= 50000 /
A+B2R
At 25C the reaction is strongly e

ENCH 421 Chemical Engineering Kinetics
Tutorial 3
1. Do you believe reaction (1) or reaction (2) below could be an elementary reaction?
C2H6 + 3 O2 2 CO2 + 3 H2O
2 C2H6 + 7 O2 4 CO2 + 6 H2O
(1)
(2)
2. The hydrogenation of ethylene to ethane is given by re

ENCH 421 Chemical Engineering Kinetics
Tutorial 4
1.
Experimental studies of a specific decomposition of A in a batch reactor show exactly the same rate at two
different temperatures:
at 400 K
-rA = 2.3 pA2
at 500 K
-rA = 2.3 pA2
where pA = [atm], rA = [m

ENCH 421 Chemical Engineering Kinetics
Tutorial 5
1.
Gaseous reactant A decomposes at constant temperature and pressure as follows:
A3R
rA = kC A
k = 0.6 min 1
The feed to the reactor consists of 50% A and 50% inert (v0 = 180 liter/min, CA0 = 300 mmol/lit

ENCH 421 Chemical Engineering Kinetics
Tutorial 12
1.
The gas-phase catalytic reaction A + B C + D was carried out in a differential reactor with the following results:
rA0
rA
yA0 = yB0 =
PA = PB = PD = 1
Total Pressure
rA
PC
rA
PA = PB = PC = 2
PA = PC =

ENCH 421 Chemical Engineering Kinetics
Tutorial 2
1.
A gas phase reaction
AB+C
is carried out isothermally in a 20 L constant volume batch reactor. 20 moles of pure A is initially
placed in the reactor. The reactor is well mixed and ideal gas equation hol

ENCH 421 Chemical Engineering Kinetics
Tutorial 1
1. A rocket engine burns a stoichiometric mixture of fuel (liquid hydrogen) in oxidant (liquid oxygen).
The combustion chamber is cylindrical (75 cm long and 60 cm in diameter) and the combustion
process p

ENCH 421 Chemical Engineering Kinetics
Tutorial 10
1.
Determine the equilibrium conversion between -100C and 150C for the elementary aqueous reaction
() = 14130
AB
() = 75300
CpA = CpB = constant
(a) Present the results in the form of a plot of temperatur

ENCH 421 Chemical Engineering Kinetics
Tutorial 6
1.
We are constructing a 1-liter popcorn popper to be operated in steady flow. First tests in this unit show that 1
liter/min of raw corn feed stream produces 28 liter/min of mixed exit stream (popped and

ENCH 421 Chemical Engineering Kinetics
Tutorial 11
1.
A+BC+D
The irreversible reaction
is carried out adiabatically in a CSTR. The heat generated and the heat removed, per unit mole of A, are plotted
below:
qG /FA0, qR/FA0 (cal/mol)
12000
10000
8000
6000

Reactor type
Molar basis
dN A
= rAV
dt
Batch
V=
CSTR
PFR
PBR
Space time:
t=
N A0
NA
dN A
rAV
V=
dFA
= rA
dW
W=
Outlet concentration for n CSTRs in
series, same V, first order rxn.,
constant
FA 0
F A1
FA 0
F A1
Ci = C A 0
i + i X
1+ X
dFA
rA
FA0
dX
= r