Normal heptane is dehydrocyclicized to toluene and hydrogen in a continuous vapor-phase

Chapter 9, Problem 9.15

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Normal heptane is dehydrocyclicized to toluene and hydrogen in a continuous vapor-phase reaction: C7H16 ! C6H5CH3 4H2 Pure heptane at 400C is fed to the reactor. The reactor operates isothermally at 400C and the reaction goes to completion. Data: The average heat capacity of n-heptane beween 25C and 400C is 0.2427 kJ/(molC). (a) Taking a basis of 1 mol of heptane fed, draw and label a flowchart. (b) Taking elemental species [C(s), H2(g)] at 25C as references, prepare and fill in an inletoutlet enthalpy table. (See Example 9.5-2.) (c) Calculate the required heat transfer to or from the reactor (state which it is) in kJ. (d) What is the heat of the heptane dehydrocyclization reaction Hr at 400C and 1 atm? (e) The calculation of Part (c) would clearly have been much simpler if you had just looked up the heat of reaction at 400C instead of calculating it after the fact. Briefly explain why you probably could not have done it that way.