Transcript Document

CHE 205
Stoichiometry
Reactive
Systems
$200
$200
$400
Flowcharts
and DOF
Balances
Empty
$200
$200
$200
$400
$400
$400
$400
$600
$600
$600
$600
$600
$800
$800
$800
$800
$800
$1000
$1000
$1000
$1000
$1000
Balance the following
equation
C7H8O + O2
CO2 + H2O
What is the fractional
conversion if 50 lbm of
propane are fed to a reactor
and 15 lbm are in the
product
What is the equilibrium
constant expression for the
reaction:
C2H4 (aq) + Cl2 (aq)
C2H4Cl2 (aq)
How much air is needed per
mole of propane if propane
is completely combusted in
the presence of 60% excess
air
Write all of the atomic
balances for the following
flow sheet
100 moles
0.25 mol C3H6/mol
0.10 mol NH3/mol
0.65 mol air/mol
n1 mol C3H6
n2 mol NH3
n3 mol O2
n4 mol N2
n5 mol C3H3N
n6 mol H2O
Given the following flow sheet, what
is the single-pass conversion
60 mol A
200
mol A
Reactor
150 mol A
50 mol B
A
B
Separator
Given the following flow sheet, what
is the yield of B
100 moles A
Reactor
10 moles A
160 moles B
10 moles C
A
A
2B (desired)
C (undesired)
Given the following flow sheet, what
is the selectivity of B relative to C
100 moles A
Reactor
10 moles A
160 moles B
10 moles C
A
A
2B (desired)
C (undesired)
Given the following flow sheet, write
out all of the extent of reaction
equations and solve
100 moles A
Reactor
10 moles A
160 moles B
10 moles C
A
A
2B (desired)
C (undesired)
Given the following flow sheet, what
is the overall conversion
200 mol A
60 mol A
Reactor
150 mol A
50 mol B
A
B
Separator
What is missing from the
following flowchart?
100 kg
0.3 kg A/kg
x1 kg A/kg
0.7 kg B/kg
x2 kg B/kg
m1 (kg)
0.2 kg B/kg
0.8 kg C/kg
Complete the following flowchart
using only variables (do not solve)
50 kg A/s
0.6 kg A/kg
0.4 kg B/kg
75 kg /s
0.4 kg B/kg
0.7 kg A/kg
0.6 kg C/kg
0.3 kg B/kg
0.2 kg A/kg
0.8 kg C/kg
Determine the number of
Degrees of Freedom in the
following system
35 lbm
m1 (lbm)
x1 lbm A/lbm
0.45 lbm A/lbm
(1-x1) lbm B/lbm
0.55 lbm B/lbm
20 lbm
0.85 lbm A/lbm
0.15 lbm B/lbm
Determine the number of Degrees of
Freedom in the overall system
m1 kg /s
50 kg A/s
x1 kg A/kg
(1-x1) kg B/kg
m3 kg /s
mo kg /s
0.4 kg B/kg
0.6 kg C/kg
0.7 kg A/kg
m2 kg /s
0.3 kg B/kg
x2 kg A/kg
x3 kg B/kg
(1-x2-x3) kg C/kg
m4 kg /s
0.2 kg A/kg
0.8 kg C/kg
What is the number of Degrees of
Freedom in the first separator for the
following system?
5000 g
m1 (g)
0.25 g A/g
0.60 g A/g
x1 g A/g
0.35 g B/g
0.25 g B/g
(1-x1) g B/g
0.40 g C/g
0.15 g C/g
m2 (g)
m3 (g)
m4 (g)
x2 g A/g
(1-x2) g B/g
3500 g
0.45 g B/g
x3 g A/g
0.55 g C/g
(1-x3) g B/g
How many balances are
independent in the following
system?
100 kg
m2 (kg)
0.3 kg A/kg
x1 kg A/kg
0.7 kg B/kg
x2 kg B/kg
(1-x1-x2) kg C/kg
m1 (kg)
0.2 kg B/kg
0.8 kg C/kg
Please write the balance on B in
the following system:
100 kg
m2 (kg)
0.3 kg A/kg
x1 kg A/kg
0.7 kg B/kg
x2 kg B/kg
(1-x1-x2) kg C/kg
m1 (kg)
0.2 kg B/kg
0.8 kg C/kg
What is the mathematical
expression that represents the
following statement: the feed ratio
of A to B is 2:1?
m1 (kg)
mA (kg)
x1 kg A/kg
(1-x1) kg B/kg
mB (kg)
Write the mathematical expression
that represents the statement – 70% of
the water is stripped from the feed
solution and sent to a processing plant
m2 (kg)
mo (kg)
x1 kg A/kg
x2 kg A/kg
(1-x1) kg H2O/kg
(1-x2) kg H2O/kg
m1 (kg H2O)
To processing
plant
What is the total molar amount of the
overhead product (mO) if 93% of A
is recovered in this stream?
200 mol
mO (mol)
0.5 mol A/mol
0.95 mol A/mol
0.5 mol B/mol
0.05 mol B/mol
mB (mol)
x1 mol A/mol
(1-x1) mol B/mol
Answers:Stoichiometry
• 200: C7H8O+(17/2)O2
• 400: 0.7 mol reacted/mol fed
• 600:K=yC2H4Cl2/(yC2H4yCl2)
• 800:38.01 mol Air/mol C3H8
• 1000:
C:25=n1+n5
H:180=6n1+3n2+3n5+2n6
N:112.7=6n1+3n2+3n5+2n6
O:27.3=2n3+n6
7CO2+4H2O
Answers:Reactive Systems
•
•
•
•
•
200: 0.25
400: Xi1=80 mols, Xi2=10 mols
600:0.8
800:16 mol B formed/mol C formed
1000: 0.833 mol reacted/ mol fed
Answers:Flowcharts and DOF
• 200: Total mass of the stream leaving
• 400: Add total mass to all exit steams and
label middle stream
• 600:0 DOF
• 800:Around whole system 1 DOF;
Whole system 2 DOF
• 1000: -1 DOF
Answers: Balances
•
•
•
•
•
200: 3
400: 70+0.2m1=m2x2
600:mA=2mB
800:0.7m0(1-x1)=m1
1000: 97.90 mol