In the pyrolytic dehydrogenation of benzene, diphenyl, triphenyl and hydrogen were produced . From a continuous reactor now, the product has the following molar compositions of 62% benzene ,13% diphenyl, 4% triphenyl and 21% hydrogen. It leaves the reactor at 1325 ⁰F and passing through a countercurrent heat exchanger to heat benzene feed at a temperature of 700 ⁰F to the reaction temperature of 1250 ⁰F. The product and feed flow rates are both 9000 lbm/hr each. Calculate: (a) change in entropy of the feed (b) change in entropy of the product (c) total entropy change as a result of the process. These molar heat capacity equations shall be used: (T in K and Cp 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
In the pyrolytic dehydrogenation of benzene, diphenyl, triphenyl and hydrogen were produced . From a continuous reactor now, the product has the following molar compositions of 62% benzene ,13% diphenyl, 4% triphenyl and 21% hydrogen. It leaves the reactor at 1325 ⁰F and passing through a countercurrent heat exchanger to heat benzene feed at a temperature of 700 ⁰F to the reaction temperature of 1250 ⁰F. The product and feed flow rates are both 9000 lbm/hr each. Calculate: (a) change in entropy of the feed (b) change in entropy of the product (c) total entropy change as a result of the process. These molar heat capacity equations shall be used: (T in K and Cp 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
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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In the pyrolytic dehydrogenation of benzene, diphenyl, triphenyl and hydrogen were produced . From a continuous reactor now, the product has the following molar compositions of 62% benzene ,13% diphenyl, 4% triphenyl and 21% hydrogen. It leaves the reactor at 1325 ⁰F and passing through a countercurrent heat exchanger to heat benzene feed at a temperature of 700 ⁰F to the reaction temperature of 1250 ⁰F. The product and feed flow rates are both 9000 lbm/hr each.
Calculate:
(a) change in entropy of the feed
(b) change in entropy of the product
(c) total entropy change as a result of the process.
These molar heat capacity equations shall be used: (T in K and Cp 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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