Direct dehydrogenation of ethylbenzene to styrene is carried out in the vapor phase with steam over a catalyst consisting primarily of iron oxide. The reaction is endothermic, and can be accomplished either adiabatically or isothermally. Both methods are used in practice. The major reaction is the reversible, endothermic conversion of ethylbenzene to styrene and hydrogen: CaHsCH₂CH3 CH3CHCH2 + H₂ AH=124.9 kJ/mol
Direct dehydrogenation of ethylbenzene to styrene is carried out in the vapor phase with steam over a catalyst consisting primarily of iron oxide. The reaction is endothermic, and can be accomplished either adiabatically or isothermally. Both methods are used in practice. The major reaction is the reversible, endothermic conversion of ethylbenzene to styrene and hydrogen: CaHsCH₂CH3 CH3CHCH2 + H₂ AH=124.9 kJ/mol
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Direct dehydrogenation of ethylbenzene to styrene is carried out in the vapor phase with steam over a
catalyst consisting primarily of iron oxide. The reaction is endothermic, and can be accomplished either
adiabatically or isothermally. Both methods are used in practice.
The major reaction is the reversible, endothermic conversion of ethylbenzene to styrene and hydrogen:
CHSCH₂CH
CoHsCHCH₂ + H₂
AH= 124.9 kJ/mol
Competing thermal reactions degrade ethylbenzene to benzene
C6H3CH₂CH3C6H6+
C₂H4
AH 101.8 kJ/mol
Styrene also reacts catalytically to toluene:
CH3CH₂CH3 + H2
CH3CH3 + CH4
AH=64.5 kJ/mol
The reactions take place at 620°C. The costs are as shown in Table 1. The production rate of
styrene is 200 mol/h.
Chemical name
Formula
Cost
(S/kmol)
Ethylbenzene
C6H5CH₂CH3
57.1
Styrene
C6H3CHCH₂
75.9
Benzene
C6H6
32.8
Toluene
C6H5CH3
25.8
Hydrogen
H₂
1.2 (as fuel)
Methane
CH4
4.0 (as fuel)
Ethylene
C₂H4
6.7 (as fuel)
Correlation for the product selectivity and distribution are given as following equations.
mol Styrene formed
0.2
S=
= 1-
mol Ethylbenzene converted
(1-x)⁰5
Mol Benzene
=
0.033S-0.215 +2.547g³
Mol Styrene
Explain how pressure help to favour rteaction?
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