Equipment Design

Presented byHanadi Al-Sendi

Supervised by:Prof. M. Fahim

Eng. Yousef Ismail

Reactor Design

introduction

• there are three main types of reactors which are: Inlet gas

Outlet gas

Batch CSTR FBR

Fixed bed ReactorCRV – (100 – 103)

Objective : Styrene Production

C6H5C2H5 + CO2 → C6H5C2H3 + CO2 + CO

Design Procedure:

-State all the assumption for all reactors:

Porosity

Φ

0.3

Diameter

D,m

3.5

Limiting reactant

Ethyl benzene

-Apply Plug flow design equation:

Ao

EB

F

r

dw

dx

-Define A rate law:

2

21

1 COAstyF

EBCO

PKPK

PPkr

Eq.1

Eq.2

- Combining Eq’s 1&2

2

21

1 COAstyF

EBCOAo PKPK

PPk

dw

dxF Eq.3

Where;

ReactorεxPCO2PEBPSty

CRV- 100

0.00760.9861

CRV - 101

0.02980.8258

CRV - 102

0.7770.77485

CRV - 103

0.00490.9985

o

EBoEB T

T

x

xPP

1

1

o

oCOCO T

T

x

xPP

1

97.11622

o

StyoSty T

T

x

xPP

1

744.0

o

EBoEB T

T

x

xPP

1

1

o

EBoEB T

T

x

xPP

1

1

o

EBoEB T

T

x

xPP

1

1

o

oCOCO T

T

x

xPP

1

135.2722

o

StyoSty T

T

x

xPP

1

63.1

o

oCOCO T

T

x

xPP

1

943.6422

o

StyoSty T

T

x

xPP

1

26.6

o

oCOCO T

T

x

xPP

1

943.6422

o

StyoSty T

T

x

xPP

1

26.6

Where;

PyP COoCO 22

PyP EBEBo

PyP stystyo

-Calculate the volume of the reactor:

b

wV

)1(

Where;

ρb : is the catalyst bulk density.

W: is the weight of catalyst.

Φ: is the bed porosity.

-Calculate the reactor length.

3.34

2

D

VL

-Calculate the thickness:

oCPES

rPt

6.0

Where;

t: thickness of reactor.P: internal pressure = 14.696Psiar: radius of the vessel = 1.75m = 5.74147 ft.

E: joint efficiency = 0.85S: stress of carbon steal = 13700Psia.Co: corrosion allowance = 0.125in .

-Calculate the cost.

ResultsCRV-100CRV-101CRV-102CRV-103

W ,kg900010,00020,00020,000

V ,m320.089322.32144.64344.643

L ,m5.3885.627.947.94

t ,cm0.53850.53850.53850.5385

Cost$22,60078,600113,500113,500

Material of construction

Carbon steel

Carbon steel

Carbon steel

Carbon steel

catalystV2O5/MgO V2O5/MgO V2O5/MgO V2O5/MgO

CRV - 104

Objective : convert CO to CO2

Oxidation reactor

Design procedure:

The same procedure used in the first four reactors .

- State all the assumption for all reactors:

Porosity

Φ

0.3

Diameter

D,m

3.5

Limiting reactant

Oxygen

-Apply a plug flow design equation:

AoF

r

dw

dx /

-Define a rate law:

COA

COOCOS PK

PPPkr

1

25.021/ Eq.5

Eq.6

Eq.4

-Combining Eq’s 4&5 :

COA

COOCOSAo PK

PPPkrF

dw

dx

1

25.021/

CRV – 104 ( results)

ε = -0.019057

x = 1

o

COoCO T

T

x

xPP

1

23.2

o

oOO T

T

x

xPP

1

5.0122

W = 40,000 kg

L = 11.0134 m

t = 0.5385 cm

Cost $ = 148,600$

Thank you for listening