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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
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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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?
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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