Lecture Notes Lecture 2
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Transcript of Lecture Notes Lecture 2
8/13/2019 Lecture Notes Lecture 2
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Dr. Eid Al-Mutairi
CHE 402
Kinetics & Reactor
Design
Oct. 13, 2008
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Exams Times
1st Exam: Nov. 16, 2008 2nd Exam: Dec. 23, 2008
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Batch Reactors Batch reactors are the simplest reactors used in
chemical processes.
Reactants are first placed inside the reactor and thenallowed to react over time.
Applications: typically used for liquid phase reactions.
When only a small amount of product is desired (process intesting phase OR product is expensive)
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CHE 402- Dr. Eid Al-Mutairi
CSTR CSTRs are very well mixed ►contents
have uniform properties (temperature,
density, etc) Reactants are continuously introduced
into the reactor, while products are
continuously removed.
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CHE 402- Dr. Eid Al-Mutairi
PFR (Tubular)Plug flow or tubular reactors consist of a hollow pipe or tube
through which reactants and products to flow through.
Applications: wide variety of operations (gas or liquid
phases)
Gasoline production
Oil cracking
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CHE 402- Dr. Eid Al-Mutairi
General Mole Balance Equation
IN - OUT + GENERATION = ACCUMULATION
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CHE 402- Dr. Eid Al-Mutairi
{Rate of flow of A into
the system (mole/time)}
{Rate of flow of A out
of the system(mole/time)}
{Rate of Generation of A by
chemical reaction within thesystem (mole/time)}
{Rate of accumulation of A
within the system (mol/time)}
IN - OUT + GENERATION = ACCUMULATION
- +
=
F A0F A0 G A
dN A/dT
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Generation
r A1
V
r A2
∆V1
∆V2
∆G A1=r A1 ∆V1
G A=∑ ∆G Ai= ∑ r Ai ∆Vi dV r G
V
A A ∫=
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
F A0 - F A + G A = dN A/dT
IN - OUT + GENERATION = ACCUMULATION
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Batch Reactor Mole Balance
General Mole Balance on System Volume V
No inflow or outflow-
Assumptions
Well mixed
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CHE 402- Dr. Eid Al-Mutairi
CSTR Mole Balance
General Mole Balance on System Volume V
Assumptions
Steady State
Well mixed
NO spatial variations in r A
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
PFR Mole Balance
General Mole Balance on System
Volume V
Steady State
Differentiate with respect to V
The integral form is:
V=dF
A
r A
FA 0
FA
∫
This is the volume necessary to reduce the entering molar flow rate (mol/s) from FA0
to the
exit molar flow rate of FA.
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CHE 402- Dr. Eid Al-Mutairi
Packed Bed Reactor MoleBalance
PBR
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Packed Bed Reactor MoleBalance
PBR
FA0 −FA + ′rAdW =dNA
dt∫
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Packed Bed Reactor MoleBalance
PBR
FA0 −FA + ′rAdW =dNA
dt∫
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Packed Bed Reactor MoleBalance
PBR
FA0 −FA + ′rAdW =dNA
dt∫
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Packed Bed Reactor MoleBalance
PBR
The integral form to find the catalyst weight is: W =dF
A′rAF
A 0
FA
∫
FA0 −FA + ′rAdW =dNA
dt∫
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CHE 402- Dr. Eid Al-Mutairi
Reactor Mole BalanceSummary
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Reactor Mole Balance
Summary
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Reactor Mole Balance
Summary
8/13/2019 Lecture Notes Lecture 2
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CHE 402- Dr. Eid Al-Mutairi
Reactor Mole Balance
Summary
8/13/2019 Lecture Notes Lecture 2
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