ENCH 405 - Midterm Exam / Winter 2016 1
ENCH 405 - WINTER 2016 — MIDTERM EXAM W
Monday, March 7, 2016 -18hOO-19h30 (90 minutes)
a) Attempt all three (3) questions
b) Show all work for full marks.
c) Open Textbook. Closed Notes. Schulich Calculators (only)
Assignment # 2 (Due on Friday, February 5, 9 AM, Submit in the class)
Enthalpy-Concentration Diagram and Analytical Solution Method (Only selected problem/s will be
graded)
Problem 1.
[Hint: Solve energy balance through enthalpy-concentration diagram to o
Solution to Assignment 5
Problem 1 (Exercise 4-45)
Solution:
Exercise 8.12
Subject: Extraction of acetone (A) from water (C) by 1,1,2-trichloroethane (S) at 25oC
Given: 1,000 kg/h of 45 wt% A in C. Liquid-liquid equilibrium data. 10 wt% A in raffinate.
Fi
Solution to Assignment 3
1
Solution to Q#1
2
3
4
Solution to Q# 2
Component
Fi
zi
z i /K i
z i *K i
Ki
C3
125
0.250
2.06
0.514
0.121595
n-C4
200
0.400
0.93
0.370
0.432432
n-C5
175
500
0.350
0.52
0.182
1.07
0.673077
1.23
Therefore, the stream is part liqui
Solution to Assignment 4
Problem 1
Separation of benzene and toluene
A column at 101 kPa is to separate 30kg/h of a bubble point solution of benzene and toluene
containing 0.6 mass-fraction toluene into an overhead product of 0.97 mass fraction benzene an
Assignment # 2 (Due on Friday, February 5, 9 AM, Submit in the class)
Enthalpy-Concentration Diagram and Analytical Solution Method (Only selected problem/s will be
graded)
Problem 1.
[Hint: Solve energy balance through enthalpy-concentration diagram to o
Assignment # 4
(Due on Friday, Feb 26, 9 am in class)
Problem # 1
(c) Feed stage
(d) What are the flow rates and composition of the streams entering and leaving stage 2 from
top? (Hint: read the compositions from the McCabe-Thiele Diagram).
Assume total c
Assignment 5
Due on March 18 (in the class)
Problem 1
Problem 2
is to be extracted using furfural. Using Figure 4.13 (a) (see next page) calculate
Problem 3
[diagram in a rectangular coordinate system (right-triangle). Use data from exercise 8.11 (see tex
ENCH 405
HW#1 (Due date: Friday, January 29, 9 am, submit in the class).
Solve the following problems from the textbook. Only selected problem(s) will be graded.
Assignment # 3
(Due on Friday, February 12, 9 am in the class)
Multicomponent flash (Rachford-Rice Equation), Bubble and Dew Point
Problem # 1
An equimolar mixture of ethane, propane, n-butane, and n-pentane is subjected to flash
vaporization at 150F and
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
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 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 - 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 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 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
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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
ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Additional problems for Midterm Preparation
1.
The following data are taken for the reaction
CA, mM:
T, C:
-rA, mM/h.:
30
50
19.8
A products:
12
50
5.00
12
75
40.0
a. Determine the apparent order of the re
ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Final Exam Study Guide
To do well in the exam you need to be able to:
Stoichiometry
1.
2.
3.
4.
5.
6.
7.
8.
9.
Write a balanced chemical reaction and write the corresponding values (magnitude and sign) of
ENCH 421 2016 Winter Dr. Hector De la Hoz Siegler
Additional problems for Midterm Preparation
1.
The following data are taken for the reaction
CA, mM:
T, C:
-rA, mM/h.:
30
50
19.8
A products:
12
50
5.00
12
75
40.0
a. Determine the apparent order of the re
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
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
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 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 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 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