Page 1 of 4
Engineering Thermodynamics
GENG 220
PROGRESS EXAM SPRING 2015
Tuesday: May 20th, 2015 @ 6:00 PM
Time allowed: 75 minutes
Name:_
ID # :_
Section:_
Problem
no.
1
2
3
Course
outcome
1
4
2
4
2
4
Total
Max
grade
Your grade
5
5
5
15
/15
Success is t
Chemical Equilibrium
As with all equilibria, the basic equation is: DG = 0
Consider A reversible, ideal gas phase reaction:
aA + bB = cC + dD
Let the initial moles be
nA nB
nC nD
(not necessarily stoichiometric)
Change due to reaction is
-adn -bdn +cdn
The Thermodynamic Network
It is desired to calculate certain unknown state
functions in terms of others which are known or can
be measured.
The known state functions are usually expressed by
the equation of state: f(P,v,T) = 0, and the so-called
ideal g
Tutorial 3
Chemical Equilibrium
1. At 300oC in the presence of a catalyst, acetylene and nitrogen react as follows:
C2H2(g) + N2(g) = 2HCN(g)
0
The standard free energy change, G573
= +30 050 kJ kmol-1. Nitrogen and acetylene are mixed in
the molar ratio
Vapour-Liquid Equilibrium (VLE)
Basic Equations
Phase equilibrium equation is applied to an equilibrium
vapour-liquid mixture at T and P:
il iv
(1)
where the subscripts l & v refer to liquid & vapour
phases and the "hat" () to one component of a mixture
Thermodynamics of Mixtures
Additional State Variables are defined to describe the
properties of mixtures:
1) Partial Molar Quantities, H i ,U i , Vi
etc.
2) Chemical Potential, mi
3) Fugacity, fi
4) Excess Free Energy of Mixing, GE (Later).
Partial Molar
Project 1
Submission
The last day for submission is Wednesday 12th April 2017.
Nitrobenzene is made by the direct nitration of benzene by nitric acid in the presence of strong
sulphuric acid solution:
C 6 H 6 HNO3 C 6 H 5 NO2 H 2 O
The actual nitrating ag
VLE at High Pressures
The hand calculations using the van Laar equation
assumed that the vapour phase was ideal:
fiv pi y i P
(1)
At higher pressures, this is no longer true
Fugacity must be calculated from a suitable equation of
state (EOS)
For hydro
Types of VLE Calculation
A) Estimation of parameters in Activity Coefficient
equations
Equations such as van Laar, Margules, Wilson, etc
give lni as a function of xi; and involves two or
more adjustable parameters, such as Aij in van Laar.
To estimate t
Chemical Engineering
Thermodynamics
CHME322
Introduction
Classical Thermodynamics is divided into:
1. Engineering Thermodynamics: studied last year
covers machines (turbines, compressors, etc)
2. Chemical
Thermodynamics:
deals
with
equilibrium, both in ch
H82CPE Chemical & Phase Equilibria
Vapour Liquid Equilibria Examples
A mixture containing 20 mol% Benzene and 80% Cyclohexane is to be distilled
isothermally under reduced pressure. It is known that a 50/50 mixture forms an
azeotrope at 40C and 206 mmHg.
Tutorial 1
Manipulations in the Thermodynamic Network
1. a)
Using steam tables, calculate the work done against the environment when 1 kg of water at 1
atm and 100oC is evaporated to steam at the same temperature and pressure. [169.4 kJ]
b)
Repeat part a)
Tutorial 5
Binary VLE
Pure component vapour pressures of Ethanol (1) and Water (2) are given by the Antoine equations (p*
in mmHg, T in K):
ln p1* = 18.5242 - 3578.91/(T - 50.51)
ln p2* = 18.3443 - 3841.20/(T - 45.16)
1) Check the normal BPt predicted by
Tutorial 2
Partial Molar Quantities
1.
Perry gives the following data for the densities of aqueous nitric acid solutions at 25 C
as a function of the concentration by weight:
w/% by wt
0
10
20
30
40
/kg m-3
997.0
1052.3
1112.3
1176.3
1241.7
w/% by wt
50
6
Tutorial 4
Single Component Phase Equilibrium
1. The triple point of CO2 is -56.2C, and the vapour pressure of solid CO2 below this temperature
is given by:
log10p* = -1353/T + 9.832
where p* is in mmHg and T in K. The latent heat of fusion at the triple
1617-OI290
Level I Computing Final T2
Page 1 of 14
Sample Questions Exam
1. What does DTP stand for? What is/are its use(s)?
2. List 4 applications of DTP.
3. List 3 DTP software programs.
4. _ is mainly categorized as a word processor.
5. Tricia needs to
Stainless Steels at High Temperatures
Materials and Applications Series, Volume 18
S tain l ess S tee l s at hi g h tem p e r at u r es
Euro Inox
Euro Inox is the European market development association for stainless steel. Members of Euro Inox
include:
Turton_AppB_Part1.qxd
5/11/12
12:21 AM
Page 61
A P P E N D I X
B
Information
for the Preliminary
Design of Fifteen
Chemical Processes
The purpose of the process designs contained in this appendix is to provide the reader
with a preliminary description of
Appendix A
Capital Cost Equations &
Curves for the CAPCOST
Program
Samir I. Abu-Eishah
Purpose:
The purpose of this Appendix is to present the
equations and figures that describe the relationships
used in the capital equipment-costing program
CAPCOST int
Sizing of heat exchangers using HYSYS or UniSim
First read heat exchanger calculations.
HYSYS and UniSim are capable of calculating Q/Tavg (which they designate as UA, even though its actually
UAF.) They can also provide a plot of T for both streams versu
Process and Plant Design (CHME 510)
Sample Problems on Chapter 1
Q1- Thiophane (C4H4S) is produced by the combination reaction of tetrahydrofuran (THF,
C4H4O) and H2S. The main reaction is
C4H4O + H2S C4H4S +H2O
1360 kg/h of THF is vaporized and mixed wit
Sample Problems on Chapter 11
1- Design the Methanol Distillation Column (T-103) in the DME Plant: For the production
of DME from methanol shown on the attached PFD and streams data and the information
given below, determine the reflux ratio, the column d