General problem solving technique
1. Use a mole balance (design equation)
2. Get the rate law as a function of T
k =k 1 exp
(
E 1 1
R T1 T
)
3. Use stoichiometry to get the concentrations as a function of X.
4. Substitute for the rate law in the mole bala
CBE 142 Study Guide 1
1. Mole Balances
a. In out + gen = Acc
Fi 0F i +Gi=
b.
dNi
dt
G i= r i dV
c.
V
2. Stoichiometry
Stoichiometric #:
r net =
r step
i
Used in QE if trying to find rate of
formation of something thats in QE.
3.
Relates rate of production
CBE140Scholars
Fall2016
MockExam
1.(6points)Considerthethreedifferentsituationsbelowandidentifywhichoneisatsteady
state,equilibrium,ortransient.Then,applytheconservationequationonthewaterineach
exampleandsimplifybycancelingterms.
a) Dryingwetlaundry
Trans
Units
When we have (/) (/) !"/! , the argument of a logarithm or the power
of an exponent must be unitless.
!"
!
!"
!
When we have the derivative , this has the same units as
When we have the derivative
!
! !
!
, this has the same units as !
CBE140Scholars
Fall2016
MockExam
1.(6points)Considerthethreedifferentsituationsbelowandidentifywhichoneisatsteady
state,equilibrium,ortransient.Then,applytheconservationequationonthewaterineach
exampleandsimplifybycancelingterms.
a) Dryingwetlaundry
b) A
CHE 140: Chemical Process Analysis
Fall 20 1 6
Homework Assignment 1 (100 pts)
Due Wednesday August 31St at 12:00 pm (noon) on Gradescope
1. (Duncan and Reimer Problem 5.4)
Condensation is an important phenomenon in liquid-vapor separations. In a common
a
CBE140,Fall2016
HomeworkAssignment1Solution
1.Beginbyrearrangingtheequationtosolvefortheconstant:
Breakdown P a intofundamentalunits:
P a =
kg
ms2
Expressthenewequationintermsoftheunitsandsimplify:
[0.943]=(none)
Theconstant0.943isdimensionlessithasnouni
Worksheet 1 Solutions
1.DistillationColumn:
You are trying to separate a mixture of components X, Y, and Z (in order of decreasing
volatilities) using a distillation column. Solve for B , 2 , wy,B , and
wz,B ( w indicates mass
fraction, wi = massofspecie
Worksheet 4 Solutions
1. Semi-batch reactor (Basic)
A batch reactor initially contains only some volume V0 of enzyme only. At time t=0, you begin
to flow in species A at a density A0 [=] (mass of A/volume) and volumetric flow rate q. There is
no outlet. W
Worksheet 2 Solutions
1. Lab with Chemical Spill (Basic)
Consider a poorly ventilated lab room of constant volume (Id hope so, at least) V containing
initially pure air. Your clumsy undergraduate student spills a whole bottle of formaldehyde (F)
in the h
CBE 162 HW01
Fall 2015
Haotong Li
Question 1
(a)
(b)
h is measured output, F is manipulated input, and Fi is disturbance input.
(c)
dV
=FiF
dt
V=Ah
d ( Ah)
dh
=A =FiF
dt
dt
P=gh
dh
=
dt
d
( gP ) = 1 dP = ( FiF )
dt
g dt
A
thus
h=
P
g
Finally
t
h ( t ) =h0
CBE 162: Dynamics and Control of Chemical Processes
Homework 2
Due: 9/11/15
Homework must be submitted by the start of class (9:10 am) on the due date. A soft copy must
be submitted to the bCourses page as a single pdf containing all your solutions and re
CBE 162: Dynamics and Control of Chemical Processes
Homework 4
Due: 9/25/14
Homework must be submitted by the start of class (9:10 am) on the due date. A PDF
containing all your solutions and relevant work or code must be submitted on the bCourses
page. N
The feed to an ammonia synthesis process usually contains a small fraction of inert
gases, such as argon. These are not condensed and thus are recycled with the
unconsumed nitrogen and hydrogen. To avoid a buildup
CBE 40 Homework 2
Due Sept 16, 2014
Please review the course homework protocol
Reading: D&R Chapter 2 pages 16-37
1. D & R 2.1
2. D & R 2.8
3. Consider the following batch recipe for honey-lavender ice
CBE 40 Homework Protocol (Fall 14)
Please follow the guidelines below when completing your weekly homework
assignments. Homework that does not follow these guidelines will not be accepted.
1. Homework must
CBE 40 Homework 7
Due Oct 28, 2014
Please review the course homework protocol
Reading: D&R Sections 3.13 - 3.15 (pages 95-106)
1. D&R 3.45
2. D&R 3.49. You do not need to be quantitative on this problem, but explain your answer
with qualitative detail.
3.
CBE 40 Extra Credit
Due December 5, 2014 at 5 pm
Submit to your GSI by email
Design a final exam practice problem
Your extra credit assignment is to create what you think would be a good problem for the final exam, and
MODELING BASED ON FUNDAMENTAL LAWS
95
3.20 Nomenclature:
Total flow rate of stream i
FT,i
Water flow rate of stream i
FW,i
Enzyme flow rate of stream i FE,i
(A) Draw system borders around the entire process write a mass balance on water.
rate in
FW ,1
rat
Lee, K. P., Arnot, T. C. and Mattia, D. (2011) A review of reverse
osmosis membrane materials for desalination-development to
date and future potential. Journal of Membrane Science, 370 (12). pp. 1-22. ISSN 0376-7388
Link to official URL (if available):
h
CBE 40 Fall 2014 Final Design Project
PROJECT OBJECTIVES
GENERAL
Understand an important issue related to water and energy
Understand how chemical engineering concepts apply to meeting a current
challenge
Understa