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Problem 4 ( Development of PFD and Economic Performance ) The hydrodealkylation of side - chain aromatics to non - substituted parents is a major
Problem Development of PFD and Economic Performance The hydrodealkylation of sidechain aromatics to nonsubstituted parents is a major process in petrochemical processes for example, benzene is the starting raw material for producing a top commodity chemical like isopropyl benzene also called cumene which accounts for about of the total worldwide propylene consumption. Cumene is mostly used to produce phenol and acetone The conversion of toluene to benzene is carried out via the reaction: at bar, either thermally at or over a suitable catalyst. Thermally, the conversion is with selectivity ~~of course, selectivity is higher with catalyst Other significant side reaction produces diphenyl via reaction: i Feeds are introduced by mixing pure toluene and hydrogen with methane. Hydrogen is recycled back to the process but to avoid accumulation of methane in process some purge stream of methane is added to the process from which valuable methane is recovered via membranes. ii All toluene is recycled. But ratio toluene of is maintained at reactor inlet to avoid formation. We will assume reaction takes place at and temperature of iii Raw feeds will be heated in furnace before introduction to the plug flow reactor and the reactor outlet products will be cooled before sending them to a single stage flash unit. A simulation of the flash unit at bar & using PengRobinson EOS gives the values in the table table includes operating data too tableFlow rate Input Out Rxtor Rxtor out Kvalue
Problem
Development of PFD and Economic Performance
The hydrodealkylation of sidechain aromatics to nonsubstituted parents is a major process in petrochemical processes for example, benzene is the starting raw material for producing a top commodity chemical like isopropyl benzene also called cumene which accounts for about of the total worldwide propylene consumption. Cumene is mostly used to produce phenol and acetone
The conversion of toluene to benzene is carried out via the reaction:
at bar, either thermally at or over a suitable catalyst. Thermally, the conversion is with selectivity ~~of course, selectivity is higher with catalyst Other significant side reaction produces diphenyl via reaction:
i Feeds are introduced by mixing pure toluene and hydrogen with methane. Hydrogen is recycled back to the process but to avoid accumulation of methane in process some purge stream of methane is added to the process from which valuable methane is recovered via membranes.
ii All toluene is recycled. But ratio toluene of is maintained at reactor inlet to avoid formation. We will assume reaction takes place at and temperature of
iii Raw feeds will be heated in furnace before introduction to the plug flow reactor and the reactor outlet products will be cooled before sending them to a single stage flash unit. A simulation of the flash unit at bar & using PengRobinson EOS gives the values in the table table includes operating data too
tableFlow rate Input Out Rxtor Rxtor out Kvalue
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