Answered: In the pyrolytic dehydrogenation of…

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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Question

In the pyrolytic dehydrogenation of Benzene, diphenyl, hydrogen and triphenyl are produced simultaneously. The product from a continuous reactor has molar composition of benzene = 60%, diphenyl =10%, triphenyl = 5% and hydrogen = 25%. It leaves now at 1300 ⁰F and passed through a countercurrent heat exchanger to heat benzene feed from a temperature of 650 ⁰F to the reaction temperature of 1200 ⁰F. The gaseous product and gaseous feed flow rates are the same, which is 8000 lbm/hr each. Calculate now the (a) change in entropy of the feed, (b) change in entropy of the product, and the (c) total entropy change as a result of the process.

Use these following molar heat capacity equations, where Temperature is in K and Cp is in cal/mol·K:

Hydrogen: Cp = 6.88 + 0.066 x 10-3 T

Benzene: Cp = 0.23 + 77.8 x 10-3 T

Diphenyl: Cp = 0.20 + 149 x 10-3 T

Triphenyl: Cp = 1.74 + 214 x 10-3 T

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