Modeling a Hippos Digestive System as Reactors in Series
Digestion of hippo feed (A) in a hippos digestive system can occur by two mechanisms:
autocatalytic microbial fermentation, or enzyme catalyzed fermentation. Digestion can also
occur in two organs:
Chemical and Biomolecular Engineering 142
HOMEWORK #1 SOLUTIONS
PROBLEM #1
PROBLEM #2
PROBLEM 3
PROBLEM 4
PROBLEM 5
a) dX/dt= -k1X
dY/dt= k1X-k2Y
dZ/dt= k2Y
X(0) = 100
Y(0) = 0
Z(0) = 0
k1 = 0.6 day-1
k2 = 0.1 day-1
b) Dependent variables: X, Y, Z
Indepen
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Chemical and Biomolecular Engineering 142
Problem Set # 9
Due 11/15/11
Problem 1
The oxidation of carbon monoxide on palladium single crystals at low pressures (between 10-8 and 10-6
torr) and temperatures ranging from about 450 K to 550 K follows a rate
Homework Set #9
CHM ENG 142
Due Date: 16 November 2010
Problem 1.
t-Butyl alcohol is used in place of lead additives in gasoline (Ind. Eng. Chem. Res., 27,
2224 (1988). t-Butyl alcohol (TBA) is formed over an Amberlyst-15 catalyst by the
liquid-phase hydr
Homework Set #1
CBE 142 Fall 2017
Due date: Thursday, 5 September 2017
Problem 1: Mole balance and Stoichiometry
The reaction A + 2B 3C takes place in an isothermal, unsteady CSTR. The feed consists of only A and
B in stoichiometric proportions. Which of
Homework Set #7
CBE 142 Fall 2017
Due date: Tuesday, October 17, 2017
Problem #1. Heat Load and Residence Time for a Non-ideal, Isothermal Reactor
The non-elementary, liquid-phase reaction A B is carried out in a non-ideal steady-state,
isothermal, reacto
CBE 142: Chemical Kinetics
& Reaction Engineering
Midterm #1
October 13th 2015
This exam is worth 120 points and 30% of your course grade. You have 80 minutes
to complete this exam, so please manage time wisely. Please read through the
questions carefully
Homework Set #4
CBE 142 Fall 2017
Due date: Tuesday, September 26, 2017
Problem 1: PSSH and QEA for NO2 Decomposition
Photochemical smog was first described in the 1950s. Nitrogen and oxygen react to form nitric
oxide in automobile engines, including NO 2
CBE 142 Chemical Kinetics and Reaction Engineering
Homework #5
Due Tuesday Oct 6th @ 8am
Problem 1: Unsteady Reactors: Start-up of a CSTR
Consider the start-up of an ideal isothermal CSTR reactor. The reactor initially contains
a solution of dye with volu
Numerical Methods in Chemical Engineering 142
Spring 2008
This handout will introduce you to the two numerical methods software packages that we will be using
in this class - Polymath and Mathcad. For the problems that we solve in class, you should be abl
Matlab Introduction
CBE 142 Fall 2015
This is a brief introduction to MATLAB for CBE 142. Matlab is a powerful numerics
package with diverse capabilities in math and engineering. It is very helpful in a reaction
engineering class because we are often task
Homework Set #2
CBE 142 Fall 2017
Due date: Tuesday, 12 September 2017
Problem 1: Comparing constant pressure and constant volume in batch and flow systems
Compare a constant pressure and a constant volume BSTR with the reaction:
A+B
8C where the rate is
Chemical Engineering 142: Chemical Kinetics and Reaction Engineering
Fall 2016
Assignment 2: Due Tuesday, September 13
Task 1: Read Fogler Chapters indicated in syllabus
Task 2: Verify that homework is stapled in order with your name, section, and SID.
Pr
Problem 1 Solution.
Part a.
Input to Polymath (ODE Solver):
d(X) / d(z) = -rho*Ac*rA/Fao
X(0) = 0
rho = 892.9
Ac = 1.96E-7
rA = -k*Ca*Cb
Fa = Fao*(1-X)
Fb = Fao*(1-X)
Fc = Fao*X
k = 0.004
Fao = 2E-5
Ca = Fa/v
Cb = Fb/v
Cc = Fc/v
v = vo*(1+eps*X)/y
eps = y
Chemical and Bimolecular Engineering 142
Problem Set # 6
Due 10/25/11
Problem 1
In discussion, we demonstrated how to find the residence time of an adiabatic CSTR
reactor given the conversion. In this problem, you will try to find the conversion of an adi
Chemical and Biomolecular Engineering 142
Problem Set #4
Due 9-25-12
1. Consider the elementary, reversible, aqueous-phase reaction , for which the
following kinetic data were obtained:
Temperature (oC)
5
35
55
85
100
120
130
140
150
kf (1/min)
3.38E-06
1
Homework 4.5
Due October 8, 2013
Reactive Distillation: A Comparative Study
The following liquid phase reaction is very thermodynamically limited with the reverse
reaction being much more favorable than the forward.
+ 2
The rate law for this reaction can
Chemical and Bimolecular Engineering 142
Problem Set # 4
Due 9/27/11
Problem 1
The reversible isomerization
m Xylene para-Xylene
follows an elementary rate law. If Xe is the equilibrium conversion,
(a) Show for a batch and a PFR:
t = tPFR = ( )
(
)
(b) Sh
ChemE 142
Homework 3
Due date: 9/24/13
1. Consider the following balanced gas-phase reaction:
3 + +
a) What is the value of for this reaction on the basis of species B?
b) Construct a stoichiometric table for this reaction in a flow system assuming B is
Chemical and Biomolecular Engineering 142
Problem Set #3
Due 9-18-12
1.
Consider the following complex reactions of the oxides of nitrogen
Reaction
Mechanisms for reactions
A) 2 N2O5 4NO2+ O2
A) a, b, c, d
B) NO + N2O5 3NO2
B) a, b, d
C) 2NO2 + O3 N2O5 +