Homework 5 - CENG 113 - Spring 2014
PROBLEM 1. (5 pts) Consider the liquid-phase reaction A => B in an isothermal CSTR. The reaction
is far from equilibrium and the forward rate is second-order in A. Show an approximate quantitative
sketch of an inverse r

Ammonia converter design problem - example solution
This is an example. The only plot required is X vs. T. These exact numbers not required.
My optimization strategy: (not the only possible strategy)
Pick X out of bed 1
Vary bed 1 T in to minimize W1 < th

Homework 4 - CENG 113 - due 5 pm, Friday, May 23, 2014
=
PROBLEM 1
You want to use a batch reactor to produce D from A in the following set of essentially irreversible
reactions in the liquid phase under isothermal conditions:
1
1)
A D
r A1=k 1 C A where

Reversible exothermic reaction, adiabatic PFRs in series, reactor design example
ASSIGNMENT - CENG 113 project in 2007 - SO2 oxidation
Design a two-stage, adiabatic, packed-bed catalytic reactor for SO2 oxidation with inter- stage cooling.
The final conve

PROBLEM 5
A reactor that is 0.025 m in internal diameter (ID) is packed with 1 kg of 1 mm-diameter catalyst
pellets. The length of the catalyst bed is 3.13 m and its volume is 0.00154 m3. You are oxidizing CO in
air under isothermal conditions where the e

HW 4, Problem 7 (based on Schmidt Problem 4.17)
This is a process for the partial, selective oxidation of ethylene (E) to ethylene oxide (EO).
We are given the partial pressures of O2, Ethylene and CO2 at the inlet of the reactor. The reactions
form ethyl

HW 4 - Problem 8
Semi-batch reactor from Fogler Essentials Chapter 6. Butanol solution is fed to reactor containing ethyl
acetate solution. I copied the Matlab script for cases 1 and 2 from CRE notes 11 on semi-batch reactors,
then modified it to add the

PROBLEM 2
Selective Catalytic Reduction (SCR) is a process that is currently being implemented in many
fossil-fueled electrical power plants around the world in order to reduce the emission of nitric
oxide. In SCR, ammonia is added, as a reducing agent, t

PROBLEM 1
You want to use a batch reactor to produce D from A in the following set of essentially irreversible
reactions in the liquid phase under isothermal conditions:
1
1)
A D
r A1=k 1 C A where k 1=0.005 min
2)
D U
r D2 =k 2 C D where k 2 =0.002 min
1

Table of Contents
. 1
Problem 1 . 1
Problem 2 . 2
Problem 3 . 3
% HW 5 - CENG 113 - Spring 2014 - SOLUTIONS
Problem 1
clear
% isothermal CSTR, 2nd order essentially irreversible
% show operating conditions on Levenspiel inverse rate plot
% find k value
%

Ammonia equilibrium for HW 5, Problem 4
Use the rate equation given. At equilibrium -rN2 = 0. Alternatively, we could use Keq from the Gibbs
free energy of reaction.
N2 + 3 H2 = 2 NH3
abbreviate as N + 3H = 2A
pi = yi Ptot
yi = Fi / Ftot
Write a stoichiom

Differential Method in BSTR
Three liquid reactions have the form: A B
Each have reaction rates of the form:
rA =
dCA
n
= kCA
dt
Find k & n for each case, given the following concentration
data for A: (in mol/dm3)
time (s)
Reaction 1
Reaction 2
Reaction 3

PROBLEM 1
This is a reversible exothermic reaction.
(a) adiabatic, end T = 313 K, end X = 0.267 (min T = 300, max T = 313)
(b) Tj = 300 K, end T = 300 K, end X = 0.666 (min T = 300, max T = 307 near X = 0.26)
(c) Tj = 310 K, end T = 310 K, end X = 0.354 (

Homework 3 assignment - CENG 113 - Spring 2014
Problems 1 and 2 use these conditions:
Reaction A = B in a constant volume batch reactor. Cpm = 2 kJ/kg/K (mass average heat capacity).
Density of reaction mixture = 1000 kg/m3. CA0 = 1000 mol/m3 (no product

PROBLEM 4 - Water Gas Shift reaction equilibria
Given a stochiometric feed of CO and water vapor at 20 bar, the minimum T at which we can have
water vapor is 180 C (453 K), which is the boiling point of water at a partial pressure of 10 bar.
To react wate

Chemical Reaction Engineering - Part 9 - thermal safety
R. K. Herz, rherz@ucsd.edu, May 2014
Safety in chemical plants
Safety in chemical plants is an important topic for the workers, the people in the surrounding
community, and the investors in the plant

Chemical Reaction Engineering - Part 6
R. K. Herz, rherz@ucsd.edu, March 2014
Methods of experimental data analysis
So far we have been given rate equations and values of rate coefficients. For new reactions or old
reactions under new conditions or cataly

Chemical Reaction Engineering - Part 5
R. K. Herz, rherz@ucsd.edu, March 2014
Gas-phase reactions with change in total moles or volume or pressure
So far, we have been considering constant volume batch reactors. Here, we are going to discuss cases
with ga

Methanol Synthesis Reactor Model
Richard K. Herz <rherz@ucsd.edu> June, 2011
We wrote a Matlab program to simulate a methanol synthesis reactor. This is a 1-dimensional, plug flow
model that assumes there are no radial gradients in the catalyst bed. The e

Chemical Reaction Engineering - Part 15 - more reactors
R. K. Herz, rherz@ucsd.edu, May 2014
More reactors
So far we have learned about the three basic types of reactors: Batch, PFR, CSTR. We have also
learned about the semi-batch variation of batch react

Chemical Reaction Engineering - Part 2
R. K. Herz, rherz@ucsd.edu, March 2014
Stoichiometry
We can write a balance equation for all components in one reaction but we don't need to do that if we
are dealing with what I call "simple" reactors. These are rea