CHBE 3225 Fall 2013
Final Exam Practice Problems Solution
Notes:
1) I will just do the problems that were not part of a previous exam, HW, or practice problems. These are
basically the ones on the newer topics.
2) There were some omitted information on th
CHBE 3225 Fall 2013
Exam 1 Practice Problems
5) (modified from Problem 6.8 in the textbook)
95% of the acetone vapor in an 85 vol% air stream is to be absorbed by countercurrent contact with pure water
in a valve-tray column. The column will operate at 20
ChBE 3225A: Spring 2014
Quiz #6
March 3, 2014
Student Name: _
Score: _ / 10
For problems involving qualitative reasoning, explain your answers clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use the reverse si
ChBE 3225A: Spring 2014
Quiz #3
Student Name: _
February 5, 2014
Score: _ / 10
For problems involving qualitative reasoning, explain your answers briefly but clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use
ChBE 3225A: Spring 2014
Quiz #1
Student Name: _
January 15, 2014
Score: _ / 10
For problems involving qualitative reasoning, explain your answers briefly but clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use
ChBE 3225A: Spring 2014
Quiz #5
February 21, 2014
Student Name: _
Score: _ / 10
For problems involving qualitative reasoning, explain your answers clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use the revers
ChBE 3225A: Spring 2014
Quiz #4
February 14, 2014
Student Name: _
Score: _ / 10
For problems involving qualitative reasoning, explain your answers briefly but clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Us
DRAFT EXAM 1 EQUATION SHEET
SF =
0=
ni( out )
niF
SR =
ni( out ,1)
ni( out ,2)
SR =
SF
1 SF
nH Q W nH Q W
s
out
LW = To Sirr =
Wmin =
Q
Q
Sirr nS nS
Ts in
Ts
out
s
in
nB nB
out
B = H ToS
To
T
nB Q 1 o Ws
nB Q 1 Ws
in
Ts
Ts
out
in
Wmi
ChBE 3225: Spring 2014
Quiz #2
Student Name: _
January 24, 2014
Score: _ / 10
For problems involving qualitative reasoning, explain your answers briefly but clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use
ChBE 3225A: Spring 2014
Quiz #8
March 28, 2014
Student Name: _
Score: _ / 10
For problems involving qualitative reasoning, explain your answers clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use the reverse s
ChBE 3225A: Spring 2014
Quiz #10
Student Name: _
April 21, 2014
Score: _ / 10
Use the reverse side if additional space is required.
No points will be awarded for answers given without explanation.
Consider crystallization from a mixture of p-xylene and o-
Ki = yi/xi
1,2 = K1/K2
zF F = xD D+ xB B
L D
y= x+ x D
V V
R
1
y=
x+
xD
R+1
R+1
L B
y= x- xD
V V
V +1
1
y= B x xB
VB
VB
y=
q
1
xzF
q-1
q-1
Eov
Ntheor
Nactual
q=
EMV =
P
Ni = m,i DF = Pm DF
Lm
N=
2
p
d
32 Lm
Ni
De,i
RT Lm
Pi
De,i
Ni
ci
Lm
Ni =
Ni =
Di H
Homework Set 4
CHBE 3225 Summer 2016
Due: Thursday, June 22, 2016
1)
An air stream contains 15% of a volatile organic component (VOC) that is to be absorbed by
countercurrent contact with pure water in a valve-tray column. The final concentration in the e
STUDENT NAME
ChBE 3225
SEPARATION PROCESS PRINCIPLES
Spring 2017
Prof. Sankar Nair
MIDTERM EXAM #1
Monday, February 27, 2017
Open Book, Open Notes, Open HWs
The total number of points in this exam is 30.
Read this page carefully, write your name on the to
ChBE 3225A Separations
Spring 2017
Problem P7
Review Crystallization Notes.
A vacuum crystallizer is to be constructed to produce 50 metric tons/day of sodium sulfate (in the form of
Na2SO4.10H2O). The enthalpy-concentration diagram for this system is giv
ChBE 3225A: SEPARATIONS
Spring 2017
Prof. Sankar Nair
Problem P8
DESIGN OF EXTRACTION SYSTEM
FOR BENZOIC ACID PRODUCTION
1
BENZOIC ACID MANUFACTURE AND USES
Benzoic acid is made by oxidation of toluene
Many uses: industrial feedstocks, food preservative
ChBE 3225: SEPARATIONS
Spring 2017
Prof. Sankar Nair
Problem P6
DISTILLATION COLUMN DESIGN FOR
A BIO-ETHANOL PLANT
Due date: Apr 5, 2017
OVERVIEW: ETHANOL FUEL PRODUCTION FROM CROPS OR BIOMASS
From Crops
WET MILLING
Corn*
Wheat
AGRO CROP
Sugarcane
DRY MIL
ChBE 3225A Separations
Spring 2017
Problem P5
Review Sections 7.1-7.3
A feed of two hydrocarbons (50 mol % A and 50 mol % B) flowing at 500 kmol/hr is to be separated by
distillation (at 1 atm). A distillate product of 98% A and a bottoms product of 98% B
, V, :3
NAME
ChBE 3225B
SEPARATION PROCESS PRINCIPLES
Spring 2013
Prof. Walton
EXAM #2
Friday, April 12, 2013
Open Book
One Page of Notes Allowed
This exam consists of 2 problems, each Worth the indicated points. The total
number of points is 60.
Pleas
STUDENT NAME
CHBE 3225A
SEPARATION PROCESS PRINCIPLES
Spring 2014
FINAL EXAM
Monday, April 28, 2014
Open Book, Open Notes, Open HWs
This exam booklet consists of 4 problems, each worth the indicated points. The total number of
points is 100.
Before beginn
ChBE 3225A, Spring 2014
HW #1 Solution Key
Problem 2.10
From Eq. (2-21) and Table 2.3 we know that according to Raoults law, the relative volatility of
a species i to j is equal to
P si
Ki
Ps
ij
s P si
Kj P j
P j
P
(1)
To find the saturated vapor press
ChBE 3225A, Spring 2014
Homework #4 Solutions
Problem 3.37
Given in the problem,
Laminar jet diameter, D = 1cm, Laminar jet length, L = 7cm. Temperature, T = 20oC = 293 K.
Solubility of H2S in water, CAi = 100 mol/m3 = 10-4 mol/cm3.
Assuming the water jet
ChBE 3225A: Spring 2014
Quiz #7
March 12, 2014
Student Name: _
Score: _ / 10
For problems involving qualitative reasoning, explain your answers clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use the reverse s
ChBE 3225A: Spring 2014
Quiz #9
April 7, 2014
Student Name: _
Score: _ / 10
For problems involving qualitative reasoning, explain your answers clearly.
For problems involving numerical calculations, show calculations on this quiz sheet.
Use the reverse si
Example: Stage-to-Stage Calculations for
a methanol-water distillation column
operating at 1 atm
F = 100 kmol/h
xF = 0.50
sat'd liquid
D, xD = 0.80
L V
L' V'
R = 2.1
xDD = 0.95xFF
B, xB
1
R. W. Rousseau
TotalMass(Moles):
kmol
h
MethanolBalance:
F D B 100