a.
b
n1 mol / h
g
b
g
n b mol CO / h g
n5 mol N 2 / h
0.010 mol CO 2 / mol
0.990 mol CH 4 / mol
100 mol / h
b
Absorber
n2 mol / h
0.300 mol CO 2 / mol
0.700 mol CH 4 / mol
6
g
Stripper
2
b
n5 mol N 2 / h
0.005 mol CO 2 / mol
0.995 mol CH 3OH / mol
g
b
g
n
Centre For Energy
Process Fundamentals
Mid Semester review
1
What are the top three areas you would like
me
me to review?
1. What are dependent/independent
variables
2. Degrees of Freedom
3. Atomic balances
4. Reactive systems
5. Unit conversions
6. Exten
Centre For Energy
Process Fundamentals
Balances on Reactive Processes
1
Heats of Reaction
Reactions are very energetic
If internal energy of product is less than reactants
internal energy of product is less than reactants
then energy is released-heat
E
Centre For Energy
Process Fundamentals
Balances on Non-Reactive Processes
1
Reference States
^ can not be known absolutely but changes in ^ (^ can be
H
H H)
determined
Up to now ^ has been found in tables
H
^ based on reference value
H
Most substances
Centre For Energy
Process Fundamentals
Energy and Energy Balances
Energy
Energy is expensive and will continue to rise
All processes use energy in one way or another
processes use energy in one way or another
directly through heating/cooling
transportin
Centre For Energy
Process Fundamentals
Multiphase Systems
1
Pure
Pure Fluid P,T space
7
At any point on the VLE line, P is the vapour
pressure at T and T is the boiling point
temperature at P
if P = 1 atm then T is normal boiling point
At any point on
Centre For Energy
Process Fundamentals
Single Phase Systems
Ph
1
So far
Looked at simple material balance
No interaction between different components in
interaction between different components in
reaction products
No effect of T and P on substances
ef
Centre For Energy
Process Fundamentals
Material Balances, Reactive Systems
1
Stoichiometry
Proportions that chemical species combine in a
chemical reaction
2SO2 + O2
2SO3
Reaction scheme must be balanced in terms of
scheme must be balanced in terms of
n
Centre For Energy
Process Fundamentals
Material Balance
Material Balances
What Goes in Must Come Out
(somewhere at some time in some form or another)
at some time in some form or another)
2
Process Classification
Batch
material fed into process, removed
Centre For Energy
Process Fundamentals
Engineering Calculations
Engineering Calculations
Objectives
Units and dimensions and conversions
Systems of units, SI, CGS, American Engineering
SI CGS
Calculation and estimation
Dimensional Homogeneity
Process Dat