ChEn 2001 Fall 2014
Due Date: 8 September 2014
Homework 1
Problem 1: Solve the following differential equations, you must show your work to receive full
credit.
( )
(
)
( )
( )
( )
( )
( )
( )
( )
Problem 2. Use a set of linear equations to balance the fo
ChEn 2001 Fall 2014
Due Date: 8 October 2014
Homework 5
Problem 1. A synthetic fiber plant uses a variety of volatile solvents. An analysis of waste
solvent vapors from one plant showed that the gas contained 20 mol% CH4, 20 mol% CS2, 10
mol% SO2 and 50 m
ChEn 2001, Homework #2
Due Wednesday, September 16, 2009
Problem 1 (Murphy 1.17). Carbon nanotubes have been proposed as a novel way to store hydrogen safely and compactly in a solid form at room temperature and pressure. Several researchers have reported
ChEn 2001 Fall 2014
Due Date: 24 October 2014
Homework 6
Problem 1. A type of coal contains 90% C, 3% H, 0.5% S, 2.5% O, 1% N and 3% ash by weight.
Assuming nitrogen and ash are inert. Air contains 21 mol% oxygen and 79 mol% nitrogen.
Calculate:
(a)
the v
ChEn 2001 Fall 2014
Due Date: 1 October 2014
Homework 4
Problem 1. Consider a process consisting of a reactor and three separators. A fresh stream of
species A and a recycle stream from separator #1 are fed to the reactor, where the following
reactions ta
ChEn 2001, Homework #5
Due Wednesday, October 14, 2009
Problem 1 (Murphy 3.24, modified). Formaldehyde (HCHO) is produced by partial oxidation of methanol (CH3 OH). Three side reactions also occur with methanol, producing formic acid (HCOOH), CO, and CO2
ChEn 2001, Homework #1
Due Friday, September 11, 2009
To receive full credit for these problems, you must show all of your work (matrix method, integration by parts, balance equations for the chemical reaction). Problem 1. Solve the following system of eq
Syllabus for ChEn 2001: Material and Energy Balances, Fall 2014
ChEn 2001: Material and Energy Balances (4 credits), Fall 2014
Primary Instructor
Prof. Kechun Zhang
Office: 265 Amundson Hall
Email: kzhang@umn.edu
Phone: 6126260635
Office Hours: TTh 14:0
Example (Murphy, p 62)
What is the mole fraction and mass fraction of glucose in a mixture of
12 g glucose, 3g sodium chloride and 85 g water?
Compound
Molecular Weight
Glucose
180
Sodium Chloride
58.5
Water
18
Example (Murphy, p 66)
What is the volumetri
Material Balance Equations: Differential Form
dmsys
=
dt
dnsys
dt
dni , sys
dt
j
all j in
=
dmi , sys
dt
m
n
j
all j out
m
i, j
i, j
all k rxns
mi , j +
all j out
kk
all j out
n
all j in
nj +
all j in
=
mj
all j out
all j in
=
ni , j +
i , k M i k
all k
Figure 6.5 Specific enthalpy and internal energy of pure water (a) As a
function of P, T, and phase (b) at 1 bar
Example 6.5. Pumping water
Compute the change in enthalpy associated with pumping
1.5 kg/s of liquid water at 60C and 5 bars to 100 bars.
Exam
Example 5.7: Defining Separator Performance
The feed to a distillation column contains 60 wt% benzene
and 40 wt% toluene. The feed rate is 100 g/s and the
column is operated in a steady state, continuous flow
mode. The distillate stream is 57 g/s benzene
ChEn 2001, Homework #3 Problem 1. Perform the following unit conversions: 1. 3.00 ft/s2 to centimeters per hour2 2. 10 psi to cheval vapeur minutes per US fluid ounce 3. 5.00 J/ C to cal/ F 4. 1.0 hp to dry US bushels centipoise per millisecond2
Due Monda
ChEn 2001 Fall 2016
Due Date: Wed 26 October 2016
Homework 6
Problem 1. A type of coal contains 90% C, 3% H, 0.5% S, 2.5% O, 1% N and 3% ash by weight.
Assuming nitrogen and ash are inert. Air contains 21 mol% oxygen and 79 mol% nitrogen.
Calculate:
(a)
t
ChEn 2001 Fall 2016
Due Date: Mon 10 October 2016
Homework 5
Problem 1. A reactor initially contains 2 kg A. At the start of the process, a water solution
containing 10wt% B is fed to the reactor with a flow rate of 10 kg/min. In the reactor, B is
convert
ChEn 2001 Fall 2016
Due Date: Monday 3 October 2016
Homework 4
Problem 1. Consider a process consisting of a reactor and three separators. A fresh stream of
species A and a recycle stream from separator #1 are fed to the reactor, where the following
react
Example 4.1: Improved synthesis of ibuprofen
In the early 1990s, when the patent for ibuprofen expired, a
new process was developed and commercialized. The new
process involves three reaction steps, starting with
isobutylbenzene and acetic anhydride:
C10H
Example 1.2 Adipic Acid Synthesis
Adipic acid is an intermediate used in the manufacture of nylon. Several
chemical steps are involved in the synthesis of adipic acid.
Reaction 1. Cyclohexane (C6H12) reacts with oxygen (O2) to produce
cyclohexanol (C6H12O
ChEn 2001 Fall 2014
Due Date: 10 December 2014
Homework 10
Problem 1. Fire hoses used in major structure fires have inside diameters of 6.40 cm. Suppose such a
hose carries a flow of 40.0 L/s starting at a gauge pressure of 1.62 6 N/m2. The hose goes 10.0
ChEn 2001, Homework #4
Due Monday, October 5, 2009
Problem 1. Consider a series of N dryers operating in series to remove the water from a wood product. The first dryer removes 1/4 of the water originally in the wood, the second dryer removes 1/9 of the w
ChEn 2001, Homework #6
Due Friday, October 30, 2009
Problem 1 (Murphy 4.12, modified). Ethylene oxide is produced by partial oxidation of ethylene: 2C2 H4 + O2 2 C2 H4 O Complete oxidation occurs as an undesired side reaction C2 H4 + 3 O2 2CO2 + 2 H2 O Et
ChEn 2001, Homework #7
Due Friday, November 13, 2009
Problem 1. Use Raoult's Law to construct a Txy diagram for toulene and ethylbenzene at 600 mmHg. The x,y should refer to the mole fraction of the more volatile component. Problem 2. Consider an equili
ChEn 2001, Homework #8
Due Friday, November 20, 2009
Problems 24 use the Txy data that you generated for ethylbenzene and toluene on Homework #7. If you did not get this problem correct on the previous homework, you should download the solution from WebV
ChEn 2001, Homework #9
Due Monday, December 7, 2009
Problem 1. We want to figure out the error involved in using constant heat capacities relative to the temperature dependent fit, using acetylene as an example. Compute the H value for heating 1 mole of a
ChEn 2001, Homework #10
Due Monday, December 14, 2009
Instructions: You should upload your final numerical answer for each part of the problems as a single assignment on WebVista. You can do this either by typing the numbers in on the submission or adding
dx
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