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Why heat exchangers (d1 and d2) are placed after reactor (c)?

Why heat exchangers (d1 and d2) are placed after reactor (c)?

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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. Fig. I shows isothermal dehydrogenation which was pioneered by BASF and has been used by them for many years. The reactor is built like a shell-and-tube heat exchanger. Ethylbenzene and steam flow through the tubes, which are packed with catalyst. The heat of reaction is supplied by hot flue gas on the shell side of the reactor -exchanger. Fresh EB Recycled EB Steam d2 d1 Steam Vent gas Recirculation of flue gas or molten salt Crude styrene Condensate Steam condensate Fig. I Isothermal dehydrogenation of ethylbenzene (EB) (a) Heater, (b) Steam superheater, (c) Reactor, (d) Heat exchanger, and (e) Condenser Why heat exchangers (d1 and d2) are placed after reactor (c)?
Transcribed Image Text:. Fig. I shows isothermal dehydrogenation which was pioneered by BASF and has been used by them for many years. The reactor is built like a shell-and-tube heat exchanger. Ethylbenzene and steam flow through the tubes, which are packed with catalyst. The heat of reaction is supplied by hot flue gas on the shell side of the reactor -exchanger. Fresh EB Recycled EB Steam d2 d1 Steam Vent gas Recirculation of flue gas or molten salt Crude styrene Condensate Steam condensate Fig. I Isothermal dehydrogenation of ethylbenzene (EB) (a) Heater, (b) Steam superheater, (c) Reactor, (d) Heat exchanger, and (e) Condenser Why heat exchangers (d1 and d2) are placed after reactor (c)?
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