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Study of Analysis of styrene Monomer Manufacture Process Usi

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Hilal AlHilali

on 29 April 2015

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Transcript of Study of Analysis of styrene Monomer Manufacture Process Usi

Study of Analysis of styrene Monomer Manufacture Process Using Aspen Plus

Sultan Qaboos University
College of Engineering
Chemical Aided Design (CHPE 4114)
Department of Petroleum and Chemical Engineering

Presented by:

Hilal Mohammed Al-Hilali 89797
Abdullah Mohammed Al khrousi 90033
Hilal Mohammed Al-Gefeili 88549
Saleh Aamer Al Maskari 90317
Mohammed khalifa Al-Yahyaai 93507

25th May, 2014

Process Flow Sheet Description
Aspen Plus Simulation
Units Description
Styrene (C6 H5 CH=CH2) is one of the most important monomers

An aromatic hydrocarbon which, under normal conditions, is a clear, colorless, flammable and toxic liquid

Major uses in the production of polystyrene, acrylonitrile, styrene resins

It is used in the manufacture of a variety of plastic products
Industrial Process of Styrene
Most common indusrial process of styrene prductions are:
1-Dehydrogenation of Ethyl benzene
2- Co-product with propylene oxide

But we get more capacity of styrene production by first process!

Dehydrogenation reaction of ethyl benzene is equilibrium, endothermic reversible reaction.
Furnace (F-100)
Operated 1025 K and 2.4
Produce hot steam(404.8 K to 1024.9 K )
Mixed with ethyl benzene

Table 9: Properties and Flowrates of Furnace
Heated to 1025 K-Heat of reaction-Endothermic
Heat duty 1770 KJ/s
Heat Exchangers
Products of reactor- 922.9 K to 699.9 K
Mixture -449.7 K to 723.7 K-with steam

Table 10: Properties and Flowrates of Heat Exchangers
Cooler (C-100)
Operated 303 K and 1.4 bar
Heat exchanger-679.9 K to 303 K
Suitable temperature -flash distillation
Table 12: Properties and Flowrates of Cooler
Heat Exchangers Con.
Products of reactor -699.9 K to 679.9 K

Distillation column -421.7 K to 449.8 K
Table 11: Properties and Flowrates of Cooler
F2 Stream
Consist of : steam
Table 1: F2 Conditions
Splitter (SP-100)
Used to split F2 into F4 and F3
Table 3: Splitted Streams Conditions
Table 2: Splitter Streams Fractions
Mixing point M-100
Figure 1: Mixing Point Operating Condisions
Table 4: Outlts Stream from Mixing Point
MIXER (M-101)
Figure 2: Operating Conditions of Mixer
Table 5: Otlets Streams from Mixer
Flash Column (FL-100)
To remove water in order to avoid any problem in the columns while doing the simulation

Input: F13 with
-Temperature, 0C :30
-Pressure, bar: 1.4
-Vapor Fraction: 0.00324
-Mole Flow ,kmol/hr :10996.694

-(F14) ; H2 :98.1%
-(F15); steam: 100%
-(F16); EB: 98.2%

Distillation Column (S-100)
To separate ethyl benzene and styrene from benzene and toluene

Input (F16) with conditions:
-Temperature, "C :30
-Pressure, bar: 0.9
-Vapor Fraction: 0
-Mole Flow ,kmol/hr :10657.03

-(F17) ; EB + Styrene
-(F18); Benzene + Toluene + Steam (goes to S-102)

Reactors (R-100 & R101)
PFR: Is used to describe chemical reactions in continuous, flowing systems.
1-High volumetric unit conversion
2-Run for long periods of time without maintenance
Six main reactions occur in styrene reactor

C6H5CH2CH3 C6H6 + C2H4
C6H5CH2CH3 + H2 C6H5CH3 + CH4
2H2O + C2H4 2CO + 4H2
H2O + CH4 CO + 3H2
H2O + CO CO2 + H2

The main reaction is highly endothermic
It is more forward at low operating pressure and high operating temperature
Reactors (R-100 & R101) Con.
First Design
Table 6: Design Specification and Operating Conditions for R-100

Short reactor length Resident time amount of styrene

Reactors (R-100 & R101) Con.
Final Design
Table 7: Design Specification and Operating Conditions for R-101
large reactor length Resident time amount of styrene

Table 8: Comparison between the Industrial Reactor and the Design Reactor

Comparison with Industrial Data
Distillation Column (S-100)
Distillation Column (S-101)
To separate Ethylbenzene from Styrene

Input (F17):
-Temperature, "C :150
-Pressure, bar: 1.4
-Vapor Fraction: 0
-Mole Flow ,kmol/hr :10505.2

Output (F19,F21):
-(F19) ; EB: 100%, (recycled)
-(F21); STYRENE: 100%


The amount of styrene production is 0.706 Kmol/h
The amount of styrene production is 36.00 Kmol/h
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